THERAGENICS CORP
8-K/A, 1997-03-25
PHARMACEUTICAL PREPARATIONS
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                   FORM 8-K/A




                                 CURRENT REPORT

     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934




       Date of Report (Date of Earliest Event Reported): January 10, 1997
                                                        (December 9, 1996)


                             THERAGENICS CORPORATION
             (Exact Name of Registrant as Specified in its Charter)


                                    Delaware
                            (State of Incorporation)


           0-15443                                   58-1528626
   (Commission File Number)             (I.R.S. Employer Identification No.)


5325 Oakbrook Parkway, Norcross, Georgia                      30093
(Address of Principal Executive Offices)                    (Zip Code)


                                 (404) 381-8338
              (Registrant's Telephone Number, Including Area Code)

<PAGE>   2


Item 2. Acquisition or Disposition of Assets

Theragenics Agrees to Purchase of Four Additional Cyclotrons

     Theragenics Corporation  ("Theragenics" or the "Company") entered into four
agreements  ("Agreements") dated December 27, 1996, each for the purchase of one
cyclotron from Ion Beam  Applications  s.a., the  manufacturer  of  Theragenics'
current four cyclotrons  ("Manufacturer").  The  Agreements,  which are attached
hereto as Exhibits  10.23 (a),  (b), (c) and (d), call for the  Manufacturer  to
install and turn over to Theragenics  one cyclotron in the late first quarter of
1998, a second  cyclotron in the late second quarter of 1998, a third  cyclotron
in the late third  quarter  of 1998 and a fourth  cyclotron  in the late  fourth
quarter of 1998. All four  agreements are payable to the  Manufacturer in Begian
Francs.

     The purchase of these four  cyclotrons  will be part of a larger  expansion
project which will combine at one location the Company's  cyclotron and assembly
facilities  that are now in separate  cities.  Also  included in this  expansion
project  will  be  administrative  offices  for  the  Company's  executives  and
management  staff.  The cost of this  expansion  including  the cost of the four
cyclotrons and the facilities to house them and the assembly and  administrative
facilities is currently expected to total approximately $20,000,000,  based upon
today's exchange rate of U.S. dollars to the Manufacturer's country's currency.

     Theragenics  currently  plans to  finance  this  expansion  project  from a
combination of current cash  balances,  cash flow from future  operations,  bank
credit  facilities  and  additional  funds from  future debt  financings,  stock
offerings or other forms of financing for this project.

Item 5. Other Events

Theragenics Secures $11 Million Credit Facility

     Theragenics  Corporation  ("Theragenics")  in an agreement with NationsBank
dated December 9, 1996,  secured a Revolving  Credit  Facility (the  "Facility")
totaling  $11,000,000,  which is  attached  hereto as Exhibit  10.24.  Under the
Facility,  $11,000,000 became immediately available to Theragenics upon signing.
Provisions of the Facility limit the amount of annual capital expenditures,  the
incurrence of additional debt and requires,  among other things, the maintenance
of certain minimum  financial  ratios.  The Facility replaces a previous Line of
Credit  Facility and  Revolving  Credit  Facility  totaling  $5,000,000  and the
approximate  $1,000,000 balance of a $2,100,000 term loan with NationsBank which
has been in place since  September 1994.  Management  plans to use proceeds from
the Facility to help finance the Company's  growth and partially  fund expansion
involving the addition of a fifth,  sixth,  seventh and eighth cyclotron and new
manufacturing and administrative facilitiesas described in Item 2 above.

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Item 7. Exhibits

Exhibit Number          Description

   10.23(a)             Purchase Agreement dated December 27, 1996 between
                        Theragenics Corporation and Ion Beam Applications s.a.
   10.23(b)             Purchase Agreement dated December 27, 1996 between
                        Theragenics Corporation and Ion Beam Applications s.a.
   10.23(c)             Purchase Agreement dated December 27, 1996 between
                        Theragenics Corporation and Ion Beam Applications s.a.
   10.23(d)             Purchase Agreement dated December 27, 1996 between
                        Theragenics Corporation and Ion Beam Applications s.a.
   10.24*               Second Amended and Restated Loan and Security
                        Agreement by and between Theragenics Corporation and
                        NationsBank, N.A. (South), Dated as of December 9, 1996

        Confidential portions of Exhibits 10.23(a) - (d) have been omitted and
have been filed separately with the Commission.

- -----
* Previously filed.



                                    SIGNATURE

Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized. THERAGENICS CORPORATION




                                           /s/ Bruce W. Smith
                                          Bruce W. Smith
                                          Secretary, Treasurer and
                                          Chief Financial Officer

Dated: March 24, 1997





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                                EXHIBIT 10.23(a)

                               Purchase Agreement
                                     between
                             Theragenics Corporation
                                       and
                           Ion Beam Applications s.a.
                                      dated
                                December 27, 1996


   Confidential  portions of this  document  have been blanked out and have been
         filed separately with the Securities and Exchange Commission.

<PAGE>   2









                               Purchase Agreement

                                     between

                          Theragenics Corporation Inc.

                                       and

                           Ion Beam Applications S.A.

                                       for
                         _____________Cyclotron Number 5

                                       and

                            Related Target Equipment








<PAGE>   3


                                Table of Contents
Purchase Agreement
1.  Interpretation............................................................3
2.  Subject Matter of Sale....................................................4
3.  Purchase Price of the Supplies............................................5
4.  Title and Risk of Loss....................................................7
5.  Delivery..................................................................7
6.  Installation of Supplies..................................................7
7.  Preparatory Work..........................................................9
8.  Acceptance...............................................................11
9.  Transportation and Insurance.............................................13
10. Export Documents, Duties and Foreign Taxes...............................14
11. Customs Duties, Buyer's Country Taxes and Import Permits.................14
12. Warranty As To Title.....................................................14
13. Design and Performance Warranty..........................................15
14. Material and Workmanship Warranty........................................15
15. Logging of Operations....................................................16
16. Training.................................................................16
17. Disclaimer of Liability for Personal Injury..............................16
18. Liability for Consequential Damages......................................17
19. Infringement of Proprietary Rights.......................................17
20. Seller's and Buyer's Proprietary Information.............................19
21. Destruction of Supplies..................................................20
22. Excusable Delay..........................................................20
23. Termination for Insolvency...............................................21
24. Spare Parts..............................................................21
25. Technical Assistance by the Seller.......................................21
26. Entire Agreement.........................................................22
27. Authorization............................................................22
28. Effective Date...........................................................22
29. Disputes.................................................................23
30. Governing Laws...........................................................23
31. Notices..................................................................23
32. Project Coordinator......................................................24
33. Assignment...............................................................25
34. Headings.................................................................25
35. Severability.............................................................25
36. Non-Waiver...............................................................25

Appendices
Cyclotron Parameters
___________ Target Parameters
Building Requirements
Building Completion Specifications
Included Spare Parts
Acceptance Criteria
Acceptance Tests
Accelerated Delivery and Acceptance Option




<PAGE>   4


                               Purchase Agreement


AGREEMENT  made as of this 27th day of  December  1996 by and  between  ION BEAM
APPLICATIONS,  S.A., a corporation  organized under the laws of Belgium,  having
its principal  office at Chemin du Cyclotron 3, 1348  Louvain-la-Neuve,  Belgium
(hereinafter  called the "Seller",  which expression includes its successors and
permitted assignees) and THERAGENICS CORPORATION, having its principal office at
5325 Oakbrook  Parkway,  Norcross,  Georgia 30093, USA  (hereinafter  called the
"Buyer", which expression includes its successors and permitted assignees).

WITNESSETH :

WHEREAS, the Seller wishes to sell to the Buyer and the Buyer wishes to buy from
the   Seller,    the   Seller's    model    ___________    cyclotron,    related
____________ equipment  and  spare  parts  therefore,  all as more  particularly
described herein : and

WHEREAS,  the Buyer wishes the Seller to assemble,  install,  start up, test and
make  operational  the  ________________  cyclotron  to be  purchased  including
related equipment and the Seller is willing to undertake this task : and

NOW, THEREFORE,  in consideration of the mutual covenants herein contained,  the
parties hereto agree as follows :

1. Interpretation

In this Agreement, unless the contrary intention appears :

"Acceptance" means the process whereby the Seller demonstrates to the Buyer that
the Supplies provided meet the requirements of the Agreement. This process shall
consist of a series of tests,  the  "Acceptance  Tests" as  defined in  Appendix
"Acceptance   Tests",   which  demonstrate  the  Supplies  meet  the  guaranteed
specifications, the Acceptance Criteria.

<PAGE>   5


"Acceptance  Criteria"  mean the  guaranteed  specifications  of the Supplies as
defined in Appendix "Acceptance Criteria".

"Acceptance  Date"  means the date on which the Buyer  agrees  that based on the
Acceptance  Tests, the Supplies have met the Acceptance  Criteria . The Supplies
shall be deemed  accepted  when the Buyer and Seller  agree in writing  that the
Acceptance Tests have been successfully completed.

"Acceptance Tests" are the tests listed in Appendix "Acceptance Tests".

"Agreement" means this document and includes its Appendices.

"Buyer's Country" means the country where the Site is located.

"Day" means calendar day;  "Week" means  calendar  week;  "Month" means calendar
month.

When the last day of any period  prescribed  for the execution of any assignment
falls on a day which is not a working day in Belgium or in the Buyer's  Country,
the  assignment  may be  performed  on  the  first  working  day  following  the
aforementioned day.

"Effective Date" has the meaning set forth in Section entitled "Effective Date".

"Excusable  Delay"  has the  meaning  set forth in Section  entitled  "Excusable
Delay".

"Site" means the Buyer's facility in Buford, Georgia, USA.

"Supplies" means all equipment,  hardware, software (including installation) and
the  associated  documentation,  support  equipment  and services to be provided
under the Agreement, as detailed in Appendix "Cyclotron Parameters" and Appendix
"____________ Target Parameters".



<PAGE>   6



2. Subject Matter of Sale

Subject to the terms and conditions of this Agreement :

a) The Seller  shall sell and deliver to the Buyer and the Buyer shall  purchase
from  the  Seller  (i)  a   ______________________   cyclotron,   the  technical
specifications  of which are more fully  described  in the  Appendix  "Cyclotron
Parameters" Appendix hereto; ii) _________________ target system,  the technical
specifications   of   which   are  more   fully   described   in  the   Appendix
"__________ Target Parameters" hereto;  and (iii) a set of spare parts listed in
the Appendix "Included Spare Parts" hereto;

b) The Seller shall also assemble, install, start up, test, make operational and
perform the Acceptance Tests on the Supplies.

c) The  Seller  shall  send one of his  specialists  to assist in  bringing  the
cyclotron to full  operational  capacity after Acceptance of the Supplies by the
Buyer, as described in Section 25.

d) The Buyer and  Seller  agree  that an option  for  accelerated  delivery  and
acceptance as described in Appendix "Accelerated Delivery and Acceptance Option"
may be  exercised  by the Buyer.  In case that option is exercised by the Buyer,
the covenants of the "Accelerated Delivery and Acceptance Option" Appendix shall
be applicable to both parties.


3. Purchase Price of the Supplies

a) The  aggregate  purchase  price  (hereinafter  the "Price") of the  Supplies,
including  packaging,  insurance and transportation of the Supplies to the Site,
the  assembly,  testing and start up of the  Supplies  described  in the Section
entitled      "Subject      Matter     of     Sale"     above,      shall     be
_______________________________________________________________.    This   price
shall also  include  the  technical  assistance  by the Seller as  described  in
Section 25, the Spare Parts as listed in Appendix "Included Spare Parts" and the
Seller's contribution to the applicable USA customs duty as stated in Section 11
of this Agreement.

b) As a down payment  equivalent to _____________  has been made by the Buyer to
the Seller on November 6, 1996, the balance of the Price set forth in subsection
a) shall be payable as follows:


<PAGE>   7


     i) _____________________________________________________________________ to
be paid to the Seller upon execution of this Agreement;

     ii)  ___________________________________________________________ to be paid
to the  Seller  on  March 1,  1997.  This  payment  shall  be  guaranteed  by an
irrevocable  standby  letter of credit to be issued in favor of and  approved by
the Seller within one month from the Effective Date.

     iii)   ____________________________________________________________  to  be
paid to the Seller on July 1,  1997.  This  payment  shall be  guaranteed  by an
irrevocable  standby  letter of credit to be issued in favor of and  approved by
the Seller by March 1, 1997.

     iv)  ___________________________________________________________ to be paid
to the Seller  within 15 days from  shipment  of the  Supplies as  evidenced  by
receipt of the  shipping  documents  and no later than  December  1, 1997 if the
shipment is delayed by Buyer's  fault.  This payment  shall be  guaranteed by an
irrevocable  standby  Letter of Credit to be issued in favor of and  approved by
the Seller by the date of shipping of the Supplies,  to be notified by Seller to
the Buyer at least 30 days in advance.

     v)  _________________________________________________________ to be paid to
the Seller within 15 days of the Acceptance of the Supplies.  This payment shall
be guaranteed by an  irrevocable  stand-by  Letter of Credit,  which can only be
exercised  during  the  year  following  the  delivery  of  the  Supplies,   and
conditioned  only  upon  successful  completion  of  the  Acceptance  Tests  and
providing  further  that,  in the event the Seller is  prevented  by the Buyer's
fault,  by a delay  on the  part of the  Buyer,  or by a  regulatory  body  with
jurisdiction over the Buyer from completing the Acceptance Tests for a period of
sixty (60) days or more,  payment  thereunder  to the Seller  shall be made upon
demand of the  Seller.  This  Letter  of Credit  shall be issued in favor of and
approved by the Seller,  such approval not to be unreasonably  withheld,  by the
date of  shipping  of the  Supplies,  to be notified by Seller to Buyer at least
thirty days in advance.

c) All  payments  by the Buyer to the Seller  under this  Agreement  shall be in
Belgian Francs and,  except those  specified in paragraph 3. b) above,  shall be
made by wire transfer within thirty (30) days from the date of invoice.


<PAGE>   8


d) All  payments  by the Buyer to the Seller will be deemed to have been made by
the Buyer on the date on which  the  Seller  has been  credited  for the  proper
amounts.  Any payment due to the Seller  which is not paid on the due date shall
accrue  interest for each started  month of delay at an annual rate of one point
above  the rate of the  "Avance  en Compte  Courant  Hors  Plafond  de la Banque
Nationale de Belgique" as published in "l'Echo" on the first day of such month.


4. Title and Risk of Loss

Except as indicated  below in this  paragraph,  title to the  Supplies  shall be
transferred  from the Seller to the Buyer when and to the  extent  payments  are
received by the Seller.  The Buyer  represents  and  warrants  that it shall not
cause or permit to be caused  any lien or  encumbrance  of any kind to be placed
upon the  Supplies  to an  extent  greater  than its share of  ownership  in the
Supplies.  It is  understood  that if the  Seller is unable to  demonstrate  the
Supplies  meet  the  Acceptance  Criteria  within  one year of  delivery  of the
Supplies to the Buyer's Site, clear title to the Supplies transfers to the Buyer
without  obligation to pay to the Seller the final payment  specified in Section
3.b.v unless the Seller has been prevented from conducting the Acceptance  Tests
as described in Section 8, last paragraph.

Risk of loss of any part of the Supplies shall pass from the Seller to the Buyer
upon delivery of such parts to the Site.


5. Delivery

The  Seller  shall  deliver  the  Supplies  to the Buyer at the Site and set the
Supplies in their final location.


6. Installation of Supplies

a) The assembly and  installation of the Supplies at the Site and the Acceptance
Tests are  planned to be  completed  by  ________________________________  after
completion  of  Site  preparation  by  the  Buyer  at  the  Seller's  reasonable
satisfaction  as  evidenced  by  an  acceptance  document  of  the  Site  ("Site
Acceptance  Document")  signed by the  Seller,  whichever  is later.  The Seller
undertakes to make its best efforts to complete the installation and testing

<PAGE>   9


within this period.  During the  installation  period the Buyer shall permit the
Seller's  employees,  subcontractors  or  agents  unlimited  access  to the Site
provided said  individuals  comply with policies and procedures  established for
the Buyer's employees regarding such matters as health and safety issues.

b)  With  reasonable  notice  to  the  Seller,  the  Buyer  and  its  authorized
representatives  shall,  during reasonable working hours, be free to inspect the
quality and  conditions of the Supplies at the Seller's site during  fabrication
and at any time upon arrival of the same at the Site and during the installation
period.  The Seller will notify in writing to the Buyer when the major materials
are  available  for  construction  of the  cyclotron.  c) The  Buyer at its sole
expense shall provide the Seller with closed  premises on or reasonably near the
Site in which the Seller may store  employee  clothing  and tools and  equipment
required for the installation.  However, the Buyer does not assume any risk with
respect to the loss or theft of any such items while on the Buyer's premises.

d) The Buyer shall,  at its sole expense,  provide the Seller with the following
utilities  required for installation of the Supplies and Acceptance Tests on the
Supplies:  electricity,  water,  compressed  air,  dry  nitrogen for venting the
vacuum  chamber,  hydrogen  gas for the ion  source,  as  described  in Appendix
"Building Requirements".  Access to telephone and fax equipment connected to the
international network is required and the Seller will pay the charges associated
with the use of this line.  The Buyer shall provide all the necessary  radiation
measuring  equipment  required for the operation and the Acceptance Tests on the
Supplies.

e) Within  fifteen  (15) days from the date of delivery of the  cyclotron at the
Site, the Buyer shall permit the Seller to produce beams at full energy and full
intensity in the cyclotron vault.

f) The Price  reflects labor  provided by the Seller.  Any  additional  labor or
costs  required by local labor codes,  etc.  will be the  responsibility  of the
Buyer.

g) The Supplies are manufactured  according to Belgian technical  standards.  If
the Buyer requires compliance of the Supplies with specific technical standards,
these  technical  standards  must be notified by the Buyer to the Seller  within
seven weeks of the Effective Date. All additional costs related to

<PAGE>   10


making  the  Supplies  conform to those  norms or  specific  standards  shall be
charged to the Buyer.

7. Preparatory Work

a) The Buyer shall have the sole  responsibility,  at its sole expense,  for the
work required to prepare the Site for installation of the Supplies. The building
to house the Supplies and the systems  contained  therein  shall comply with the
specifications   detailed  in  Appendix  "Building  Requirements"  and  Appendix
"Building Completion Specifications". As soon as possible after completion, and,
at the latest,  on  _________________,  the Seller shall prepare for the Buyer a
proposed  layout and prepare such other plans and  memoranda as are necessary to
transmit data to the Buyer's  architects and engineers.  By  _____________,  the
Buyer shall furnish to the Seller  drawings and plans for the Site including the
building and systems detailed in Appendix  "Building  Requirements" and Appendix
"Building  Completion  Specifications" in sufficient detail to enable the Seller
to judge  whether the Site will be  satisfactory  for the Supplies and will meet
the  specifications  detailed in Appendix  "Building  Requirements" and Appendix
"Building  Completion  Specifications".  Within four (4) weeks of the receipt of
this initial set of architectural and engineering drawings and plans, the Seller
shall provide the Buyer with  comments  thereon and detailed  information  as to
such modifications therein as the Seller deems necessary including such drawings
and  technical  documents  as may be  required  by the  Buyer  to  complete  the
installation of the cables,  cooling water and compressed air systems.  However,
the time devoted to preparation by personnel of Seller of additional  layouts or
drawings  and/or  reviews  of  revised  sets of  architectural  and  engineering
drawings will be invoiced at Seller's  regular rates. No additional  charge will
be made for telephone  consultations.  Travel and related expenses incurred as a
result of attendance by personnel of the Seller  required at meeting  outside of
Belgium   with   the   Buyer's   architects,   engineers,   consultants   and/or
representatives  will be reimbursed by the Buyer. With respect to the foregoing,
the  responsibility  for  determining  whether  conflict  exists  between  local
building  codes and/or other laws or government  regulations  and the content of
drawings,  data sheets,  memoranda or other forms of communication  submitted by
the Seller is solely the responsibility of the Buyer, his architects,  engineers
and/or  consultants.  The  definitive  drawings and plans for the Site,  made in
accordance  with  the  Seller's  comments  and  recommendations,  will  then  be
furnished  by the  Buyer to the  Seller  by  ___________.  In  addition,  unless
otherwise specified, the Buyer shall have the sole responsibility for the design
and construction of the radiation monitoring systems, of the shielding

<PAGE>   11


required to prevent  radiation leakage and of the systems required to handle the
disposal of radioactive waste.

Any delay on the part of the Seller in meeting its  obligations  related to this
Section  by more  than ten (10)  days  will add a number  of days to the  period
provided for the  performance  by the Buyer equal to the number of days of delay
by the Seller.

b) Before  commencing  installation,  the Seller shall  inspect the Site and the
Buyer shall  submit to the Seller the Site  Acceptance  Document to be signed by
the Seller confirming that the preparatory work meets all the criteria set forth
in the Section entitled  "Installation of Supplies",  paragraph c) and d) and in
Appendix   "Building    Requirements"   and   Appendix   "Building    Completion
Specifications".   This   acceptance   document  only   indicates  the  Seller's
willingness to begin the  installation of the Supplies in the Buyer's  building.
It  does  not  discharge  the  Buyer  and  his  subcontractors  of any of  their
responsibilities   regarding  the  building.   The  Buyer  shall   complete  the
preparatory  work at the Site by  _______________.  If the  preparatory  work as
regards the cyclotron  vault is  substantially  completed  before that date, the
Buyer shall  accept  delivery  and/or  installation  of the  Supplies as soon as
possible under the applicable laws and regulations.  In the event that such work
has not been completed before that date, or if for any other reason the Buyer is
unable to accept delivery of the Supplies or  commencement  of the  installation
thereof by that date, the Buyer shall immediately give the Seller written notice
of this fact and the  anticipated  new date for  completion  of the  preparatory
work. In any case, the Seller may ship the Supplies to the Buyer at any time and
the  Buyer  shall  store  them  in one of its  warehouses  until  the  date  the
preparatory work is completed.

c) One week before  commencing  installation and setting of the cyclotron in its
vault,  the Buyer shall allow the Seller  full  access to the  cyclotron  vault,
power supplies and control room and all other rooms related to the  installation
of the Supplies to allow for the measurement of line-up marks to be performed.

d) The Buyer's completion,  to the reasonable satisfaction of the Seller, of its
undertakings  in this  section  and  elsewhere  in this  Agreement  relating  to
preparation of the Site and the continuous  furnishing of necessary services and
permits set forth in the Section entitled "Installation of Supplies",  paragraph
c), d) and e) and in Section entitled "Custom Duties,  Buyer's Country Taxes and
Import Permits" and the requirements detailed in Appendix "Building

<PAGE>   12


Requirements"  and  Appendix  "Building  Completion  Specifications"  shall be a
condition precedent to the Seller's commitment to perform within the time period
specified under the Section entitled  "Installation of Supplies" hereof, and any
delay or  interruption  by the  Buyer in  meeting  its  obligations  under  this
Agreement in a timely  fashion  shall extend the Seller's  time to perform under
this  Agreement  including  but not  limited to Seller's  time to  exercise  and
perform under the option for  accelerated  delivery and  acceptance  outlined in
Appendix  "Accelerated Delivery and Acceptance Option", by a period equal to the
period of the Buyer's delay or interruption plus, if shipment and/or delivery is
delayed by Buyer's  fault or at Buyer's  request,  an  additional  period not to
exceed four weeks to reschedule  shipment and/or delivery of the Supplies and/or
personnel as may be required.

In the event of any such delay or  interruption,  the Buyer will  reimburse  the
Seller for any  reasonable  costs  incurred as a direct  result of such delay or
interruption.  Additionally,  if such  postponement or  interruption  delays the
Buyer's  obligation  to make any of the payments  set forth in Section  entitled
"Purchase Price of the Supplies", paragraph b) hereof, interest will be computed
for each  started  month of delay at an annual  rate one point above the rate of
the "Avance en Compte  Courant Hors Plafond de la Banque  Nationale de Belgique"
as published in "l'Echo" on the first day of such month.

If all the  conditions  necessary  for the  Seller  to sign the Site  Acceptance
Document  referred  to in the  above  Section  have  not been met at the time of
delivery of the Supplies,  the Seller will  nonetheless make its best efforts to
start the  installation  of the Supplies as soon as reasonably  possible and the
Buyer will give the Seller any reasonable  support to allow the Seller to do so.
However,  beginning of installation of the Supplies in the building,  under such
conditions,  will under no circumstances be considered as implicit acceptance of
the Site by the Seller.


8. Acceptance

On the date set by the Seller for the conduct of the  Acceptance  Tests,  and in
the presence of the Buyer's  representatives,  the Seller shall begin to conduct
the agreed-upon Acceptance Tests.

Not more than twenty four (24) hours following the completion of such tests, the
Buyer shall either accept the Supplies as conforming to the requirements of the

<PAGE>   13


Agreement  by  issuing  an  acceptance  certificate   "Acceptance   Certificate"
acknowledging  that  decision,  or advise the Seller in writing of the extent to
which the Supplies do not meet the requirements of the Agreement.

The Buyer shall not withhold the issue of the Acceptance  Certificate on account
of minor omissions or defects in the Supplies which do not substantially  affect
their use but may designate in the Acceptance  Certificate such minors omissions
or defects. The Seller shall promptly make good these omissions or defects.

If the Buyer does not give notice within the period  stipulated above, or begins
using the  Supplies for its own use,  such tests shall be deemed  satisfactorily
completed,  the Acceptance  Certificate  shall be deemed issued on that date and
the related  acceptance  payment shall be paid to the Seller within 15 days from
that date.

If  the  Buyer   gives  the  Seller   notice  that  such  tests  have  not  been
satisfactorily  completed,  the  Seller  shall  make  such  adjustments  as  are
necessary  and  repeat  the   Acceptance   Tests  until  the  Buyer  deems  them
satisfactory pursuant to the terms set out above.

Until ___________,  the Seller  shall have  unimpeded  access to the Supplies to
complete the Acceptance Tests. If the Seller is unable to successfully  complete
the Acceptance Tests by  _____________,  the Buyer shall be free to begin use of
the  Supplies  forty five (45) days later.  Should the  Supplies be put into use
under this  condition,  it is  understood  the Buyer and Seller will make a good
faith effort to facilitate  the completion of the  Acceptance  Tests,  but it is
further  understood that the Buyer's production of Pd-103 with the machine takes
precedence.  The Buyer agrees to allow the Seller three (3) prescheduled days of
unimpeded access to the Supplies per month during the period between ___________
until the period for acceptance has expired as specified in Section 4 "Title and
Risk of Loss".

If a dispute  arises  between  the Buyer and the Seller  concerning  whether the
Acceptance Tests have been successfully  completed or concerning the issuance of
the  Acceptance  Certificate,  the Buyer and the Seller  will  jointly  agree to
obtain the services of the American Arbitration Association ("AAA") to arbitrate
the dispute,  as described in Section 29  hereafter.  Both parties will abide by
AAA's recommendations.


<PAGE>   14


If the Seller is prevented  either by the Buyer or by any  regulatory  body that
has juridiction over the Buyer from conducting the Acceptance Tests for a period
of sixty (60) days,  the Buyer  shall be deemed to have  accepted  the  Supplies
sixty  (60) days  after the  Seller  was first  prevented  from  conducting  the
Acceptance  Tests. If the Seller is prevented by force majeure or events similar
to  those  enumerated  under  Section  "Excusable  Delay"  from  conducting  the
Acceptance  Tests, the Buyer shall pay 50% of the Acceptance  payment as defined
in Section 3 b) v). In either  case the Seller  shall  complete  the  Acceptance
Tests within the period remaining at the time the impediment began.


9. Transportation and Insurance

Seller shall at its own expense :

i) Obtain appropriate  property and liability  insurance covering loss or damage
to the Supplies  and  injuries to  individuals  during the  construction  of the
Supplies and during the  transportation  of the Supplies from the Seller's plant
to the Site.

ii) Pay all freight and other transportation charges associated with delivery of
the Supplies to the Site, and have a representative  present during the transfer
of the Supplies from the port of entry to the Site.

iii) Maintain worker's compensation insurance during the assembly,  installation
and testing of the  Supplies,  as  required  by  applicable  law,  covering  its
employees  and,  upon request  from Buyer,  provide a  certificate  of insurance
evidencing such coverage.

Buyer shall at its own expense:

i) Obtain appropriate  property and liability  insurance covering loss or damage
to the Supplies  between  delivery of the Supplies at the Site and the time when
the  Seller  has  been  paid in full  for the  amounts  under  Section  entitled
"Purchase Price of the Supplies". In such insurance policies, both the Buyer and
the Seller shall be named as insured parties.

ii) Arrange for the  destruction,  pick-up  and/or  clearing  away of all waste,
including the Supplies  packaging  except for the disposal of radioactive  waste
which is covered in section 12 of appendix "Building Completion Specifications".

<PAGE>   15


The Buyer and the Seller  shall each take out and  maintain at their own expense
during the period from receipt of the  Supplies at the Site through  Acceptance,
insurance to provide  coverage for both itself and the other party for an amount
of at least one million US dollars  (US$  1,000,000)  per  accident  against any
direct and indirect liability for bodily injury and death to individuals and all
direct or  indirect  costs,  losses  and  damages to the  property  of the other
arising  out of  each  other's  acts  or  omissions  in  unloading,  assembling,
installing and testing of the Supplies.


10. Export Documents, Duties and Foreign Taxes

The Seller will be  responsible  for obtaining all necessary  export  permits or
licences  relating  to the  Supplies  and the Buyer will  offer such  reasonable
assistance  in this regard as the Seller may  request.  The Seller shall pay any
and all export  duties and all other taxes  required  to be paid  outside of the
Buyer's Country in connection with the sale of the Supplies.


11. Customs Duties, Buyer's Country Taxes and Import Permits

The Buyer  shall pay all sales,  use,  gross  receipts,  excise and other  taxes
assessed  or levied by the  Buyer's  Country or any other  taxing  jurisdiction,
state or local,  within the Buyer's  Country,  against the Buyer  (including any
fines, penalties and interests thereof) as a result of or in connection with the
sale, use, delivery, storage or transfer of the Supplies.

The Seller agrees to equally share with the Buyer the cost of the import customs
duties levied by the customs authorities of the USA at the entry of the Supplies
into the USA, up to a maximum  cost for the Seller  equal to two percent (2%) of
the price of the Supplies.

The Buyer shall be responsible  for obtaining all necessary  permits or licences
with respect to the  importation of the Supplies in the Buyer's  Country and the
installation  and use of the Supplies at the Site, and the Seller will offer the
Buyer such reasonable assistance in this regard as the Buyer may request.


12.  Warranty As To Title

The Seller warrants good title to the Supplies.



<PAGE>   16



13. Design and Performance Warranty

The Seller hereby  warrants  that the Supplies  will perform in accordance  with
applicable  design  and  performance   specifications   set  forth  in  Appendix
"Cyclotron Parameters" and in Appendix "________ Target Parameters" for a period
of one (1) year after the  Acceptance  Date. The Seller shall resolve any design
flaws appearing during the first year following the Acceptance of the Supplies.


14. Material and Workmanship Warranty

The  Seller  hereby  warrants  that the  Supplies  will be free from  defects in
material  and  workmanship  for a  period  of one  (1)  year  from  the  date of
acceptance of the Supplies by the Buyer or fifteen (15) months from the date the
Supplies are put in their final  location in the Buyer's vault if the Acceptance
Date is delayed at the Buyer's  request or through the Buyer's fault,  whichever
period is shorter: provided,  however, that this warranty shall not apply to ion
source stamped cathodes and chimneys,  puller electrodes,  air filters, targets,
oil for the vacuum  pumps,  demineralizing  column,  gas bottles (H2 for the ion
source, N2 for  venting,...),  and other  consumables;  that the Seller makes no
warranty with respect to failures notified after the warranty period or failures
during operation without logging or failures due to alteration, misapplications,
abuse, abnormal conditions of temperature,  dirt, corrosive matter,  maintenance
not  carried  out  according  to the  Seller's  instructions,  lack  of  trained
personnel for maintenance,  operation above rated capacities either  intentional
or otherwise,  or in an otherwise  improper  manner or physical damage caused by
persons  other than  employees or agents of the Seller;  that the Seller's  sole
liability  under valid  warranty  regarding  claims for defects in material  and
workmanship is limited, at the option of the Seller, to repair or replacement of
the defective parts; that with respect to components purchased by the Seller for
incorporation into the Supplies  essentially  without  modification,  the Seller
makes no  warranties  of its own but  assigns  to the  Buyer  the full  warranty
extended to the Seller as part of the original purchase of the component.

If, due to a fault of the Seller,  the Supplies  have not passed the  Acceptance
Tests by _____________, the Seller's warranty shall start and be in effect until
 _________________.


<PAGE>   17


The Seller  shall  bear the cost and risk of loss  during  transport  of (i) any
defective  part or components  being  returned to the Seller's  factory with the
Seller's  agreement and (ii) any repaired or replacement  item being returned to
the Buyer.  Products or parts returned without the agreement of the Seller shall
be at the Buyer's  sole risk and expense.  The Seller  shall bear any  personnel
costs incurred in connection  with the  fulfillment of the Seller's  obligations
under this warranty.

The foregoing warranties are exclusive and are given and accepted in lieu of all
other warranties of quality written or oral,  express or implied,  and all other
warranties are hereby disclaimed.


15. Logging of Operations

The Buyer shall keep a logbook of operation  for the  Supplies.  In this logbook
shall be  documented  all  sessions of  operation of the Supplies as well as any
problems  encountered  during  operation of the Supplies.  If the Buyer requests
assistance  from the Seller in  resolving a problem  with the  Supplies  and the
information in the log is relevant to this resolution, the Buyer may at its sole
discretion  make the log available to the Seller . If the Buyer presents a claim
against the  warranty  provided  by the  Seller,  a copy of the log must be made
available to the Seller.  It is  understood  by the Seller that the  information
contained in the Log may be of a proprietary  nature and is therefore covered by
the confidentiality agreement between the parties.


16. Training

The Seller agrees to provide up to two days of training in  _________ operation,
preventative  maintenance and repair to the Buyers' personnel at the Site during
or immediately after the installation  period, with the exact dates and times to
be mutually  agreed by the Buyer and Seller.  The cost of such training shall be
the responsibility of the Seller.


17. Disclaimer of Liability for Personal Injury

The Seller and the Buyer hereby acknowledge that the products,  as offered,  are
highly sophisticated devices which should be operated only by trained personnel;
that it is the Buyer's sole obligation to retain and train such personnel or

<PAGE>   18


have it trained,  possibly by the Seller;  that, where  necessary,  the Supplies
contain  interlocking  devices  designed to prevent their  operation in a manner
which  would  cause  injury  to such  personnel,  but as in the  case  with  all
equipment  utilizing  high  voltages,  such  personnel  should  assume  that the
interlocking  devices are  inoperative and should take  appropriate  measures to
ensure that the voltage  has been turned off prior to begin  working  where high
voltage is present during the start up and/or operation of the Supplies; that it
is inherent in the  operation of the  Supplies  that  portions  thereof may emit
dangerous  ionizing  radiation  and may become  activated  during  their  normal
operation;  that it is the Buyer's sole  obligation  to  determine  the level of
radioactivity,  to ensure that a system exists for determining and recording the
levels of  radioactivity  and to ensure that no personnel  or other  persons are
exposed to radiation in excess of that permitted by relevant law or regulations.

Based upon the  foregoing  acknowledgments,  it is,  therefore,  agreed that the
Seller shall not incur any  liability  for personal  injury to any party arising
out of the operations and  maintenance of the Supplies  unless such liability is
solely  caused by a gross  negligence  on the part of the Seller in the  design,
implementation  or  documentation  including but not limited to maintenance  and
operation manuals for the Supplies. In order to give effect to these limitations
of the Seller's liability, and as an express condition of sale, the Buyer hereby
agrees to indemnify and hold the Seller  harmless  from any and all claims,  but
limited by the  exclusion  of  negligent  acts or  omissions  as outlined in the
preceding sentence, damages and liability, including reasonable attorney's fees,
arising  out of a claim  against the Seller for  personal  injuries of any party
occasioned by the operation and/or maintenance of such Supplies.


18. Liability for Consequential Damages

The Seller's  liability to the Buyer for damages howsoever caused shall under no
circumstances  whatsoever  (including  the decision of an  arbitration  panel or
court of law)  exceed  the  payments  actually  received  by the  Seller for the
Supplies  and the Seller shall under no  circumstances  have any  liability  for
special,  incidental,  indirect  or  consequential  damages,  including  without
limitation liability for loss of use, loss of profits, damage or injury to other
property or persons.



<PAGE>   19



19.  Infringement of Proprietary Rights

a) The Seller shall  indemnify  and hold  harmless the Buyer against any and all
losses,  liabilities  and  expenses,  by reason of any third party claim,  suit,
action or proceeding for alleged  infringement  of any  copyright,  trademark or
patent  of the  Buyer's  Country  or  alleged  conversion  of any  trade  secret
resulting from or arising in connection with the manufacture,  installation, use
or sale of the Supplies or any part thereof  including  any and all judgments or
decrees which may be rendered against the Buyer (and reasonable  attorney's fees
if Seller  should  fail to defend as  provided  in  subsection  b)  hereof,  and
settlements  made  arising out of any such  claim,  suit,  action or  proceeding
provided,  however  that this  indemnity  shall not  extend to any  infringement
resulting  from a breach  by the  Buyer  of this  Agreement  or of the  Seller's
instructions for the operation of the Supplies.  The Seller shall however not be
liable for any  infringement  or claim based upon the use of the Supplies or any
portion of the  documentation  in combination with other equipment or technology
not supplied by the Seller or resulting from any modification made by the Buyer,
without approval or instruction by Seller.

b) The Seller shall defend at its own expense all suits,  actions or proceedings
brought  against the Buyer with respect to the matters  listed in  subsection a)
above. The Buyer shall have the right at its option and at its sole expense,  to
participate  in the  defense  of any such  claim,  suit,  action or  proceeding,
without  relieving  the  Seller of any  obligation  hereunder.  The Buyer  shall
promptly  notify the  Seller in writing  after any such claim is made or suit is
brought and shall  cooperate with Seller in the defense  thereof as requested by
the Seller,  and the Seller  agrees to  reimburse  the Buyer for its  reasonable
out-of-pocket  expenses incurred at Seller's specific request in connection with
such  cooperation.  The  Buyer  shall  immediately  notify  the  Seller  of  any
infringement  claim made or  threatened  and shall refrain from any admission of
liability,  and will not  negotiate  or enter into any  settlement  without  the
Seller's prior consent.

c) If,  however,  as a  consequence  of a final  determination  of any  suit for
infringement  or any court decision  involving any injunction  resulting from or
arising in connection  with the  manufacture or sale of the Supplies or any part
thereof furnished or employed by the Seller hereunder,  the Buyer is enjoined or
limited  in any  material  manner in the use of said  Supplies  or part,  Seller
shall,  at its option and at its own expense either i) procure for the Buyer the
right to continue use of said Supplies or part, ii) so modify the Supplies or

<PAGE>   20


part so as to render them  non-infringing  without any significant effect to use
thereof, or iii) replace the Supplies or part with an equivalent  non-infringing
product.


20. Seller's and Buyer's Proprietary Information

Upon completion of the Acceptance  Tests,  the Seller shall furnish to the Buyer
free of charge  information,  manuals  and  drawings  in English and with metric
units of measure  relating  to the  Supplies  and  instructions  to the Buyer in
sufficient  detail to enable the Buyer and its employees to operate,  calibrate,
maintain and repair the Supplies and all parts thereof.  A definitive version of
the documentation,  including the modifications that are specific to the Buyer's
configuration and that are made during the final stages of installation, will be
provided six (6) months after the  completion  of the  Acceptances  Tests.  Such
information,  manuals,  drawings  and  instructions  and the  written  materials
furnished  by the Seller to the Buyer  under the Section  entitled  "Preparatory
Work"  hereof shall remain the property of the Seller and the Buyer shall have a
royalty-free  license  to  use  the  same  in  connection  with  the  operation,
calibration, maintenance and repair of the Supplies. The Buyer shall not use any
of the proprietary information supplied by the Seller for any other purpose than
the operation, calibration, maintenance and repair of the Supplies and the Buyer
shall not register, apply for registration or attempt to acquire any other legal
protection  for the said  proprietary  information in its own name, or any other
name,  or take any  action  which may  affect  the  Seller's  rights,  title and
interest in and to the  technology in any country,  without  obtaining the prior
consent of the Seller.  The Buyer shall treat such  information and materials in
the same  manner  as it  treats  its own  proprietary  information  and will use
similar  means to  protect  it from  unauthorized  disclosure.  The  same  Buyer
covenants and agrees that the contents of such written  information or materials
shall  not be  divulged  to any other  person,  firm or  corporation,  except as
allowed above.

The Seller agrees that all  information  transmitted  from Buyer to Seller under
this contract  including but not limited to,  information  relating to research,
development, manufacturing, testing, accounting and marketing will be considered
confidential  information.   This  confidential  information  will  be  held  in
confidence and not disclosed to third parties by the Seller.  This  confidential
information  shall be held in  confidence by the Seller using the same degree of
care as the Seller uses in  protecting  its own  confidential  information.  The
Seller shall only use such  confidential  information for the purpose of meeting
its obligations under this Agreement.



<PAGE>   21



21. Destruction of Supplies

In the event that prior to the delivery of the Supplies,  the Supplies are lost,
destroyed  or  damaged  to such an extent  that  they  cannot  be  repaired  and
delivered  in  accordance  with the  delivery  schedule set forth in the Section
entitled "Installation of Supplies",  provided the event is not a willful act of
the Seller, the time reasonably  required by the Seller to furnish a replacement
for the  Supplies or to  accomplish  such  repairs  shall be deemed an Excusable
Delay under the Section entitled  "Excusable  Delay" and the Seller shall not be
deemed to be in default or to have breached its duties hereunder.



22. Excusable Delay

Notwithstanding anything to the contrary herein contained, if the performance of
this  Agreement  by any  party  or the  obligation  of any  party  hereunder  is
prevented,  restricted  or  interfered  with by reason of : i) fire,  explosion,
strike,  lockout,  labor  dispute,  casualty  or  accident,  epidemic,  cyclone,
drought,  flood or ii) war,  revolution,  riot, civil commotion,  acts of public
enemies,  blockage  or  embargo,  or iii) any law or  proclamation,  regulation,
ordinance, demand or requirement of any applicable government or any subdivision
thereof  or  representative  of any  such  government,  or iv)  any  other  acts
whatsoever,  whether  similar  or  dissimilar  to those  enumerated,  beyond the
reasonable  control of a party  hereto,  then,  and in that event,  the party so
affected  shall  promptly  notify the other  party of all  reasonable  resulting
difficulties.  Upon such notice,  the disabled party shall,  for the duration of
its disability (referred to as "Excusable Delay" in this Agreement),  be excused
from the performance of such of its obligations as are prevented, restricted, or
interfered  with  by  reason  of the  occurrence  of any  of  the  events  above
enumerated  and such  party  shall  not be deemed to be in  default  under  this
Agreement  nor be subject to any  liability  or damage.  The time period  during
which any party is to perform  under this  Agreement  shall be  extended  by the
period of any Excusable Delay. Excusable Delay under the same terms occurring in
respect to the Seller's  sub-contractors  shall be deemed to be Excusable  Delay
occurring to the Seller.

If the Seller is prevented from proceeding according to any of the schedules set
out in this Agreement by the Buyer's fault, by a delay on the part of the Buyer,

<PAGE>   22


or by a regulatory body with jurisdiction over the Buyer's site, or if the Buyer
delays a payment or the issuance of a Letter of Credit  pursuant to Section 3 by
more than fifteen (15) days past the due date,  then all the dates  contained in
this  Agreement  for  completion  by the Seller of its  obligations  and rights,
including but not limited to the right to exercise the accelerated  delivery and
acceptance  option,  shall be  postponed  by an  additional  period equal to the
delay.


23. Termination for Insolvency

In the event that either the Buyer or the Seller :

a) makes a general assignment for the benefit of creditors or becomes insolvent;

b) files an insolvency petition in bankruptcy;

c) petitions for or acquiesces in the  appointment  of any receiver,  trustee or
similar officer to liquidate or conserve its business or any substantial part of
its assets ;

d) commences,  under the laws of any jurisdiction,  any proceeding involving its
insolvency,  bankruptcy,   reorganization,   adjustment  of  debt,  dissolution,
liquidation  or any other  similar  proceeding  for the  release of  financially
distressed debtors ; or

e) becomes a party to any proceeding or action of the type described above in c)
or d) and such proceeding or action remains undismissed or unstayed for a period
of more than sixty (60) days,


then the other party may, by written notice, terminate this Agreement.


24. Spare Parts

The Seller agrees to make available to the Buyer,  as the Buyer may from time to
time require, ________________,  spare parts and components to the Supplies, and
the  Seller  agrees to exert  reasonable  efforts to meet the  Buyer's  delivery
requirements  for said parts and  components  or acceptable  substitutes.  It is
understood  that the  parties  shall  negotiate  in good  faith  reasonable  and
mutually agreeable prices for said spare parts and components.



<PAGE>   23



25. Technical Assistance by the Seller

Immediately  following the  successful  completion of the  Acceptance  Tests the
Seller  shall send one of its  specialists  to assist the Buyer in bringing  the
cyclotron to full  operational  capacity.  The  specialist  shall be the project
coordinator  or, if he is not  available,  someone of equal or better  technical
expertise,  this other person to be approved by the Buyer,  such approval not to
be unreasonably  withheld. The Seller's specialist will remain at the site for a
period of 28 days unless the Buyer  agrees that the  services of the  specialist
are no longer required.  During this period,  the Buyer's specialist will define
the tasks to be  performed  by the  Seller's  specialist  with the  objective of
verifying  the  cyclotron  1) is fully  operational,  2) performs  according  to
specifications  within the production  environment and 3) its automated  control
system performs according to specifications. This period of technical assistance
does not relieve the Seller of any of its warranty  obligations,  including  the
requirement  that the Seller  send any  personnel  required  to the Site to make
repairs  should the  Supplies  be found to not meet  specifications  during this
period.


26. Entire Agreement

This Agreement,  made in two originals,  one for each party, contains the entire
agreement  between the parties and shall  supersede all previous  communications
and  agreements,  whether oral or written,  with  respect to the subject  matter
hereof and the provisions  hereof may not be modified or superseded except by an
instrument in writing signed by a duly authorized  officer or  representative of
each of the parties hereto.


27. Authorization

By virtue of having  affixed  their  respective  signatures  below,  each of the
parties  hereto  warrants  that it has obtained all  authorization  necessary to
enter into and perform its obligations under this Agreement.


28. Effective Date

This Agreement  shall become  effective as of the date upon which payment i), as
set forth in Section entitled  "Purchase Price of the Supplies",  is received by
the Seller.



<PAGE>   24



29. Disputes

With respect to any  controversy  arising out of or relating to this  Agreement,
such controversy shall be settled by final and binding  arbitration in New York,
NY,  USA,  in  accordance  with the  then-existing  rules (the  "Rules")  of the
American Arbitration Association ("AAA") and judgment upon the award rendered by
the  arbitrators  may be  entered  in any  court  having  jurisdiction  thereof;
provided,  however,  that the law applicable to any  controversy  and the law by
which this  Agreement  shall be construed  and governed  shall be the law of the
State  of New  York,  regardless  of its or  any  jurisdiction's  choice  of law
principles.  In any  arbitration,  pursuant  to this  Agreement,  the  award  or
decision  shall  be  rendered  by a  majority  of  the  members  of a  Board  of
Arbitration  consisting of three (3) members,  one of whom shall be appointed by
each  party  and the  third of whom  shall be the  Chairman  of the panel and be
appointed by mutual agreement of said two  party-appointed  arbitrators.  In the
event of failure of said two  arbitrators  to agree upon the  appointment of the
third  arbitrator   within  sixty  (60)  days  after  the  commencement  of  the
arbitration  proceeding,  the third  arbitrator shall be appointed by the AAA in
accordance  with the Rules. In the event that either party shall fail to appoint
an arbitrator  within thirty (30) days after the commencement of the arbitration
proceeding,  such arbitrator and the third  arbitrator shall be appointed by the
AAA in  accordance  with the  Rules.  The  Rules of  Evidence  and the  Right to
Discovery shall be applicable to both parties.

Work under this Agreement shall continue during the arbitration  proceedings and
payments due to the Seller shall not be withheld on account of such  proceedings
unless such  particular work or payment is the subject matter of the arbitration
in which case this provision shall not apply to such particular work or payment.

The parties agree to equally share the expenses associated with this arbitration
procedure.


30. Governing Laws

This Agreement  shall be governed by and construed in all respects in accordance
with the laws of the State of New York, USA.



<PAGE>   25



31. Notices

a) Any notice  given under this  Agreement  shall be made in  writing,  shall be
given by first class air mail,  telex,  telecopier or commercial cable and shall
be addressed to :

In the case of the Seller:
      Ion Beam Applications
      Chemin du Cyclotron, 3
      1348 Louvain-la-Neuve
      Belgium
      Attn : Mr. Yves Jongen
      Fax Number : 32-10-47.58.10

In the case of the Buyer :
      Theragenics Corporation
      5325, Oakbrook Parkway
      Norcross, GA 30093
      USA
      Attn : Mr. Glenn Dill
      Fax Number : 1 (404) 381 84 47

Either party,  by written  notice to the other,  may change the address to which
notices will be directed.

b) Any notice shall be deemed given on the date personally  delivered or sent by
telex,  telecopier or cable and fifteen (15) days after the date of mailing,  if
mailed.


32. Project Coordinator

Upon signing this Agreement,  both parties shall designate a representative  who
will act as Project  Coordinator  and official  addressee for all  communication
resulting from this  Agreement,  other than any official  notice given under the
Section  entitled   "Notices".   All  requests  for  service,   transmittals  of
information,  reports on training  activity,  and other  communication  required
under this  agreement  shall be sent by and directed to the  respective  Project
Coordinators. Informal conversations occurring person-to-person or by phone,

<PAGE>   26


requests and  information  shall be validated by an appropriate  written form as
confirmation.  Any communication sent to others than those designated as Project
Coordinators,  or in a  manner  not in  accordance  with the  Notices  procedure
specified in this Agreement will be considered as informal and non-existent.


33. Assignment

This  Agreement  shall inure to the  benefit of and be binding  upon each of the
parties hereto and their  respective  successors and assignees,  but neither the
rights nor the duties of either party hereunder may be assigned,  in whole or in
part by either party, without the prior written consent of the other party. Such
consent shall not be unreasonably withheld by either party. Any assignment shall
not relieve the assignee of any of the Agreement obligations of the assignor.


34. Headings

The headings  contained  within this  Agreement are  established  solely for the
convenience  of the  two  parties  and  are not  intended  to and do not  limit,
construe or modify any of the terms and conditions included hereof.


35. Severability

If  any  term  or  provision  of  this  Agreement  is  held  to  be  illegal  or
unenforceable, then this Agreement, except for such part or parts thereof, shall
continue to be in full force and effect.

In the event of any  inconsistency  between a provision of the conditions of the
Agreement and the content of an Appendix to this  Agreement,  and if the parties
cannot  agree on the  clause to take  precedence,  the AAA of Section 29 will be
asked to  mediate/arbitrate  the dispute  and the parties  agree to abide by the
finding of said association.



36.  Non-Waiver

The failure by either party to enforce at any time or for any period of time any
of the  provisions  hereof shall not be a waiver of such  provisions  nor of the
right of such party thereafter to enforce each and every such provision.


<PAGE>   27


IN WITNESS  WHEREOF,  the parties  have caused this  Agreement to be executed in
duplicate by their duly qualified officers or representatives.

THERAGENICS CORPORATION Inc.

Not Required
Christine Jacobs
President

/s/ Bruce Smith                                      /s/ Glenn Dill
Bruce Smith                                          Glenn Dill
Chief Financial Officer                              Director of Operations

ION BEAM APPLICATIONS, S.A.

/s/ Yves Jongen                                      /s/Sabine de Vohgel
Yves Jongen                                          Sabine de Voghel
President                                            Area Sales Manager




<PAGE>   28

                                APPENDIX                             
                                                                    
                            CYCLOTRON PARAMETERS

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission
                                                                        
                                                                         


                                                         METHOD OF VERIFICATION
 BEAM                                                   FOR THE ACCEPTANCE TESTS
                                                             not required
                                                             calculated
                                                             measured
                                                             rationale
                                                             calculated
 POWER CONSUMPTION                                         
                                                             measured
                                                             measured
 MAGNETIC STRUCTURE                                        
                                                             value provided
                                                             value provided
                                                             value provided
                                                             value provided
                                                             value provided
                                                             value provided
                                                             value provided





Theragenics/IBA Contract - Cyclotron #5 - _____________ - p.1

<PAGE>   29

The Seller agrees that if the Buyer develops at its own expense a
______________ to ___________, and if the device does not interfere or
compromise the functioning of this _______, the Seller will cooperate with the
Buyer to integrate this __________ into its design _________.


 R.F. SYSTEM
                                                                 value provided
                                                                 value provided
                                                                 value provided
                                                                 value provided
                                                                 value provided
                                                                 value provided
                                                                 value provided
                                                                 value provided
                                                                 value provided
 ION SOURCE                                                     
                                                                 verified
                                                                 value provided
 The Seller agrees to provide _______________________.





Theragenics/IBA Contract - Cyclotron #5 - _____________ - p.2

<PAGE>   30

 GENERAL DIMENSIONS
                                                                  value provided
                                                                  value provided
                                                                  value provided
                                                                  value provided
 WEIGHT                                                             
                                                                  value provided
 VACUUM SYSTEM
 The Buyer will make its best effort to have _____ whenever possible.

 CONTROL SYSTEM


 STRAY BEAM CONTROL


 WATER MANIFOLD
         The water manifold will be __________________________.





Theragenics/IBA Contract - Cyclotron #5 - _____________ - p.3
<PAGE>   31

                                    APPENDIX

                           ________ TARGET PARAMETERS

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission


                                                         METHOD OF VERIFICATION
 TESTS                                                      FOR THE ACCEPTANCE
                                                               calculated 
                                                               measured   
                                                               measured   
                                                               calculated 
                                                               specified  
                                                               specified  
                                                               measured*  


Notes:
         1)      It is understood the Seller will make its best effort to
                 ____________.

         2)      The Buyer understands the ____________ to be delivered is to
                 function at ____________.  The Seller will however consider the
                 possibility of ______________ and if this can be done at
                 _______________, will _________________.

* to be measured after completion of the Acceptance Tests





Theragenics/IBA Contract - Cyclotron #5 - _____________ - p.4
<PAGE>   32

                                    APPENDIX

                             BUILDING REQUIREMENTS

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission

 A.       RECOMMENDED ROOM CONFIGURATION


 1.       CYCLOTRON VAULT

 Inside dimensions:

 Recommended vault shielding:

 Floor loading:
 Floor drains:                   As required by local code & subject to health 
                                 safety rules

 Temperature limits:

 Humidity limits:
 Power dissipated in the air:

 Lifting eyebolts and anchoring points shall be installed in the vault
 according to IBA specifications, if required.


 2.       POWER SUPPLY AND CONTROL ROOM

 Inside dimensions:
 Temperature limits:

 Humidity limits:

 Power dissipated in the air:
 The door height for the insertion of the Supplies shall be more than 5 cm
 higher than that of the Supplies.

 Power supply, control and cyclotron rooms will be located close to each other
 to avoid long cables and shall not be more than 30 meters away from each
 other.


 3.       CYCLOTRON COOLING SYSTEM REQUIREMENTS

 The cooling system should be located as close to the cyclotron vault as
 possible, with access to a water supply.

 A __________ is sufficient to accommodate the heat exchanger, column and pump.





Theragenics/IBA Contract - Cyclotron #5 - _____________ - p.5
<PAGE>   33

 Locating the cooling system on a different level from the cyclotron's is
 possible to a maximum height difference of __________ the cyclotron median
 plane _____________.

 The area should be easily accessible for servicing the equipment.


 B.       SERVICES SPECIFICATIONS

 1.       ELECTRICAL POWER

 _________, other voltages possible if specified within two weeks of the time
 of order.  
 ______________.

 ______________.

 Voltage to be nominal ____________.
 
 Delivered to IBA's power distribution cabinet in the power supply room.

 The Buyer shall provide, install and terminate the power cables to the "mains"
 connection (AC power input) of all IBA power distribution cabinets in
 accordance with local electrical code requirements.


 2.       COOLING, SECONDARY LOOP

 Water requirements (chiller loop):

 Flow:

 Temperature:

 Power to be removed:

 D P:

 ____________ water has to be delivered in the cooling room ___________.
 Drains according to local building codes should be included.


 3.       COMPRESSED AIR

 Pressure:

 Quality:

 Average flow:

 Peak flow:

 Outlets must be provided.





Theragenics/IBA Contract - Cyclotron #5 - _____________ - p.6
<PAGE>   34

 4.       ____________ FOR CYCLOTRON VENTING

 Pressure:

 Quantity:


 5.       _____________ FOR THE ION SOURCE

 Pressure:

 Quantity:

 Quality:





Theragenics/IBA Contract - Cyclotron #5 - _____________ - p.7
<PAGE>   35

                                    APPENDIX

                       BUILDING COMPLETION SPECIFICATIONS

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission



The building shall be fully completed and shall have been accepted by the
Seller prior to the arrival of both the Seller's team and the equipment
necessary for the installation of the Supplies.  The Seller will start
installation work when the following conditions have been complied with to
Seller's reasonable satisfaction.

A "Site Acceptance Document" will be provided by the Seller to the Buyer and
will list the mutually agreed progress of the site reaching specification.

1.       CONCRETE

All concrete must cure for at least ________ prior to arrival of the Supplies
and related equipment in order to avoid _______________ problems.


2.       PIPES AND CABLES

All conduits, cable trenches, raceways, cable trays and related equipment shall
be installed by the Buyer prior to equipment arrival.  Cables and pipes shall
be relayed to the various working areas by way of a _________ having a
____________, built in accordance with relevant electrical standards.  The
_______ shall be equipped with cable ladders and/or cable ducts and be covered
(planks or galvanized roofing...).

The Seller shall provide detailed plans and recommendations regarding location,
size and number of trenches/pipes and cable trays that are required.

Cables and pipes for the ____________ shall be laid in different cable trays or
conduits from the cable trays or conduits housing the ___________.
_____________ cables are to be separately routed.

The Seller recommends that the trench be provided with ___________________.

______________ are needed for power cables, control cables, cyclotron system
water cooling pipes, vacuum system water cooling pipes, compressed air pipes,
gas pipes and ________________.

It is the Buyer's responsibility to ensure that the cable routing system meets
local electrical codes and requirements.





Theragenics/IBA Contract - Cyclotron #5 - _____________ - p.8
<PAGE>   36

3.       SERVICES

All services, as described in Appendix "Building Requirements", shall be
installed and made ready to be put into operation, before installation
commences.


4.       SECONDARY WATER COOLING CONNECTIONS

All piping from the Buyer's water cooling system must be installed.  Piping,
routed to locations suggested by the Seller, should have _______________ prior
to equipment installation.  A water make-up line should be provided.


5.       DUST

All floors, ceilings and walls including the inside of the trenches and other
openings shall be given a surface that minimizes dust generation.  It is
recommended that all surfaces be painted in a light color to improve visibility
and to promote safety.  All painting, sanding, placement of doors and windows
or similar will be completed.


6.       LIGHTING AND ELECTRICAL EQUIPMENT POWER

Suitable and sufficient lighting shall be provided in all work areas.  Standard
recommendations are as follows:

                -Vault
                -Power supply room
                -Control room

Emergency lighting should be available in all relevant areas.

Single phase outlets shall be located at intervals of 3 meters or less in each
room where Seller's equipment will be installed.


7.       COMPRESSED AIR OUTLETS

Exact location for the compressed air outlet will be specified for the
particular application by the Seller to the Buyer in due time.





Theragenics/IBA Contract - Cyclotron #5 - _____________ - p.9
<PAGE>   37

8.       POWER SUPPLY AND CONTROL ROOM FLOORING

This room requires a raised or "computer type" flooring.


9.       VENTILATION

The control and power supply rooms will be air-conditioned to ensure optimal
operation of the electronic equipment.  The other areas will be ventilated and
heated when necessary.  Ventilation conditions and other conditions, shall be
organized according to the current regulations in the Buyer's country.  The
relative humidity level will not exceed ____% in all relevant areas.  The
passageways of ventilation ducts in the walls shall comply with the
________________.


10.      HEATING

A temperature at ________ will be maintained in all relevant areas during the
installation and testing of the equipment.


11.      RADIATION PROTECTION

While the Seller can offer building design suggestions, the entire
responsibilities for meeting all local codes and regulations regarding
radiation protection remain with the Buyer.  The building and all work areas
will comply with all relevant safety standards concerning radiation protection
during all phases of construction, installation, testing and operation.  The
Buyer will be responsible for installation plans of a radiation protection
system in accordance with local codes and regulations.


12.      INFRASTRUCTURE & SERVICES

The Seller requires sufficient office space, tool storage, locker, furniture
and shower facilities for its personnel during the period of installation and
testing.  Construction site access must also meet the approval of the Seller's
engineer.

The Buyer must, at his own expense arrange for the destruction, pick-up and/or
clearing away of all waste, including Seller's Supplies packaging except
radioactive waste which will be handled as follows.  The Buyer agrees to
provide an uncontaminated area directly in front of the cyclotron vault that
can be used for unpacking components of the Supplies during assembly with the
understanding that all packing materials and other waste must be removed from
this area before the start of beam tests at which time the area in front of the
vault will be incorporated into the contaminated Hot Maintenance Area.  The
Buyer will also provide appropriate disposable protective clothing and gear for
Seller's personnel during installation and testing and will at its own expense
dispose of all such protective clothing and gear.  The Buyer will also at its
own expense dispose of one 55 gallon drum of solid radioactive waste produced
by Seller's personnel during installation.  For any additional





Theragenics/IBA Contract - Cyclotron #5 - _____________ - p.10
<PAGE>   38

radioactive waste produced by Seller's personnel during the installation
process, the Buyer and Seller agree to equally share the cost of disposal up to
a maximum of ____________ paid by the Seller.

Besides the maintenance of the building site, providing security and fire
protection is also the Buyer's responsibility.


13.      COMMUNICATION AND SURVEILLANCE EQUIPMENT

An intercom system shall interlink the ______________.  It would be useful to
be able to communicate from the ____________.  It is suggested that a
________________ be used in the ___________ for personnel safety.


14.      INSERTION OF THE SUPPLIES

a)       An appropriate opening through the wall shall be made in the cyclotron
         vault to allow for passage of the cyclotron.  This opening shall be
         closed by the Buyer as soon as the cyclotron will have been rigged
         into the cyclotron vault as closing of the opening is necessary for
         progressing with the installation of the Supplies.  The inside surface
         of the vault closing will be finished within 5 days after the
         cyclotron has been place in its final location.

b)       A maneuvering area for a heavy trailer ______________ unloading and a
         covered area ____________ for the assembly of the major components of
         the Supplies must be provided for in front of the opening outside the
         vault with adequate access to nearby roads.

         The covered area shall be such as to be able to serve as storage area
         for the rest of the Supplies while the cyclotron is rigged and the
         opening in the vault is closed.  Its floor shall support the use of a
         three-ton forklift truck.

         The ground of the cyclotron vault and of the unloading area shall be
         surfaced with reinforced concrete capable of withstanding the
         necessary maneuvering of the cyclotron into position.

c)       All doors, corridors and other passageways leading to the control room
         or any other room where Seller's equipment will be installed shall be
         cleared so as to allow transportation of the Seller's equipment by
         mean of a three-ton forklift truck or a similar transportation vehicle
         from the unloading area to the place of final installation of the said
         equipment.

d)       For unloading and installation of additional equipment delivered to
         the Site during the installation period, the Buyer shall prepare
         building access and surroundings in order to allow access and
         unloading of 10-ton trucks (unloading platform if possible).  It must
         be possible to perform the trucks unloading and the introduction of
         the additional equipment in the building with a hand-lift.  The
         possibility to use the Buyer's fork-lift if needed would be
         appreciated.





Theragenics/IBA Contract - Cyclotron #5 - _____________ - p.11
<PAGE>   39

15.      CONSULTING SERVICES

Typically, prior to the issuance of a purchase order or execution of some other
form of purchase agreement, the Seller will have prepared a preliminary layout
of the Buyer's facility and furnished various data regarding required building
services.  After the purchase agreement has become effective, the Seller,
without additional charge, will make a final layout and prepare such other
plans and memoranda necessary to transmit data to the Buyer's architects and
engineers.  Similarly, the Seller, without additional charge, will review the
initial set of architectural and engineering drawings and minor revisions
thereof.  However, the time devoted to preparation by the Seller's personnel of
additional layouts or drawings and/or reviews of revised sets of architectural
and engineering drawings will be invoiced at the Seller's regular rates.  No
additional charge will be made for telephone consultations.  Travel and related
expenses incurred as a result of attendance by the Seller personnel required at
meetings outside of Belgium with the Buyer's architects, engineers, consultants
and/or representatives will be reimbursed by the Buyer.  With respect to the
foregoing, the responsibility for determining whether conflict exists between
local building codes and/or other laws or government regulations and the
content of drawings, data sheets, memoranda or other forms of communication
submitted by the Seller is solely the responsibility of the Buyer, his
architects, engineers and/or consultants.





Theragenics/IBA Contract - Cyclotron #5 - _____________ - p.12
<PAGE>   40

                                    APPENDIX

                              INCLUDED SPARE PARTS


                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission



The following spare parts are included in the total purchase price of the
Supplies:



         -other miscellaneous spares for a value of __________, to be specified
          by the Buyer.





Theragenics/IBA Contract - Cyclotron #5 - _____________ - p.13
<PAGE>   41

                                    APPENDIX

                              ACCEPTANCE CRITERIA

                     Confidential Portions of this Appendix
                     have been omitted and filed separately
                              with the Commission


The Buyer is prepared to purchase the Supplies because the Seller has
represented that they will possess certain characteristics which make them
useful and of value to the Buyer.  The following Acceptance Criteria embody the
Buyer's understanding of these characteristics and therefore the Buyer's
willingness to purchase the Supplies is predicated upon the Supplies actually
having these characteristics.  The Acceptance Tests which follow are intended
to establish whether or not the Supplies are likely to possess these
characteristics and consequently determine if the Buyer should pay the full
agreed price for the Supplies.

Acceptance of the Supplies by the Buyer requires that they meet the following
minimum criteria as demonstrated by the Acceptance Tests:

1.       The Supplies must conform with the parameters set out in the Appendix.
"Cyclotron Parameters" and the Appendix "______________ Target Parameters."

2.       All of the items making up the Supplies must function together in a
way which provides reliable, continuous operation with _________________.  This
performance must be sustainable over a routine production schedule defined as
_______________.  Furthermore, the ___________________.

3.       The target system must be designed so that it efficiently utilizes the
protons impinging the target.  The rate of Pd-103 production in the rhodium
target must meet or exceed __________.  If the rate of production is determined
during the Acceptance Test to be _____________ of the above production rate,
the Seller may correct the deficiency by _____________, i.e., the guaranteed
intensity as referred to in Appendix "Cyclotron Parameters".

4.       Void.

5.       Routine operation as defined in Item 2 above must not lead to
structural damage to internal components of the cyclotron or the target
assembly due to interactions between the beam and such components.

6.       The radiation level within the cyclotron must not increase as a result
of proton and neutron activation and target evaporation to a level which makes
it unsafe to maintain and service the internal components.

7.       The target handling device shall reliably remove the ______________
target from the cyclotron and place it into a shielded container for manual
transfer to the target processing laboratory.  The operation of the target
handling device shall be _______________________.  A written procedure,
providing adequate radiation protection, shall be prepared in case it is
necessary to _________________.  The rhodium surface and all other surfaces of
the target handling system





Theragenics/IBA Contract - Cyclotron #5 - _____________ - p.14
<PAGE>   42

shall be shielded so an operator can safely enter the cyclotron vault to
transfer the shielded target out for processing.





Theragenics/IBA Contract - Cyclotron #5 - _____________ - p.15
<PAGE>   43

                                    APPENDIX

                                ACCEPTANCE TESTS

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission

The following tests were developed based on experience gained through the
operation of the first three IBA __________ cyclotrons.  They provide a
reasonable test of the functionality of the Supplies and when combined with the
Technical Assistance provided by the Seller as called for in Section 25 of the
Contract, should provide the Buyer a fully functional cyclotron properly
integrated into Buyer's production environment.

All radiation monitoring and measuring equipment used in these tests will be
provided by the Buyer.  All targets and the _________ are the Buyer's
responsibility and at its own expense.

Test 1.  The Supplies shall be demonstrated to comply with the specifications
set out in the Appendix "Cyclotron Parameters" and the Appendix "___________
Target Parameters" by the means specified in the Appendices.

Test 2.  When the Supplies have been declared fully operational by the Seller,
the target handling device shall be cycled through a complete transfer from
demounting a fully installed target as it would be installed for a production
run through placing the target into a shielded container and the container
closed.  This portion of this test shall be deemed passed when ___________ have
been completed.  The target shall be transferred from the cyclotron to the
shielded container 5 times following the routine procedure for
__________________.

Test 3.  When the Supplies are fully installed and Tests 1 and 2 have been
successfully completed, the Supplies must operate for ____________________.
The target must then be removed and inspected in the hot cell to determine that
the beam strike was on target, _________________.  When the Buyer concurs in
writing, such concurrence not to be unreasonably withheld, that the Supplies
performed according to the specifications, the Supplies will be deemed to have
been accepted and Seller become eligible for the Acceptance Payment.





Theragenics/IBA Contract - Cyclotron #5 - _____________ - p.16
<PAGE>   44

                                   APPENDIX

                  ACCELERATED DELIVERY AND ACCEPTANCE OPTION

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission


The Buyer has the option to request to the Seller, at any time during this
Agreement, to work on an accelerated schedule basis in order to have the
Supplies accepted at an earlier date than the scheduled acceptance date of
__________________.  Official request must be made in writing and addressed to
Yves Jongen, President of IBA.

In the case the Buyer exercises this option, the Buyer will pay the Seller an
additional sum of ___________ for each complete day between the actual date of
early acceptance and ______________, including the day of
_______________________.





Theragenics/IBA Contract - Cyclotron #5 - _____________ - p.17

<PAGE>   1

                                EXHIBIT 10.23(b)

                               Purchase Agreement
                                     between
                             Theragenics Corporation
                                       and
                           Ion Beam Applications s.a.
                                      dated
                                December 27, 1996


Confidentialportions of this  document have been blanked out and have been filed
            separately with the Securities and Exchange Commission.

<PAGE>   2










                               Purchase Agreement

                                     between

                          Theragenics Corporation Inc.

                                       and

                           Ion Beam Applications S.A.

                                       for

                       _______________ Cyclotron Number 6

                                       and

                            Related Target Equipment








<PAGE>   3


                                Table of Contents
Purchase Agreement
1.  Interpretation............................................................3
2.  Subject Matter of Sale....................................................4
3.  Purchase Price of the Supplies............................................5
4.  Title and Risk of Loss....................................................7
5.  Delivery..................................................................7
6.  Installation of Supplies..................................................7
7.  Preparatory Work..........................................................9
8.  Acceptance...............................................................11
9.  Transportation and Insurance.............................................13
10. Export Documents, Duties and Foreign Taxes...............................14
11. Customs Duties, Buyer's Country Taxes and Import Permits.................14
12. Warranty As To Title.....................................................14
13. Design and Performance Warranty..........................................15
14. Material and Workmanship Warranty........................................15
15. Logging of Operations....................................................16
16. Training.................................................................16
17. Disclaimer of Liability for Personal Injury..............................16
18. Liability for Consequential Damages......................................17
19.  Infringement of Proprietary Rights......................................18
20. Seller's and Buyer's Proprietary Information.............................19
21. Destruction of Supplies..................................................20
22. Excusable Delay..........................................................20
23. Termination for Insolvency...............................................21
24. Spare Parts..............................................................21
25. Technical Assistance by the Seller.......................................21
26. Entire Agreement.........................................................22
27. Authorization............................................................22
28. Effective Date...........................................................22
29. Disputes.................................................................23
30. Governing Laws...........................................................23
31. Notices..................................................................23
32. Project Coordinator......................................................24
33. Assignment...............................................................25
34. Headings.................................................................25
35. Severability.............................................................25
36. Non-Waiver...............................................................25

Appendices
Cyclotron Parameters
__________ Target Parameters
Building Requirements
Building Completion Specifications
Included Spare Parts
Acceptance Criteria
Acceptance Tests
Accelerated Delivery and Acceptance Option





<PAGE>   4


                               Purchase Agreement


AGREEMENT  made as of this 27th day of  December  1996 by and  between  ION BEAM
APPLICATIONS,  S.A., a corporation  organized under the laws of Belgium,  having
its principal  office at Chemin du Cyclotron 3, 1348  Louvain-la-Neuve,  Belgium
(hereinafter  called the "Seller",  which expression includes its successors and
permitted assignees) and THERAGENICS CORPORATION, having its principal office at
5325 Oakbrook  Parkway,  Norcross,  Georgia 30093, USA  (hereinafter  called the
"Buyer", which expression includes its successors and permitted assignees).

WITNESSETH :

WHEREAS, the Seller wishes to sell to the Buyer and the Buyer wishes to buy from
the Seller, the Seller's model _________ cyclotron, related ___________ targetry
equipment and spare parts therefore, all as more particularly described herein :
and

WHEREAS,  the Buyer wishes the Seller to assemble,  install,  start up, test and
make operational the ______________  cyclotron to be purchased including related
equipment and the Seller is willing to undertake this task : and

NOW, THEREFORE,  in consideration of the mutual covenants herein contained,  the
parties hereto agree as follows :


1. Interpretation

In this Agreement, unless the contrary intention appears :

"Acceptance" means the process whereby the Seller demonstrates to the Buyer that
the Supplies provided meet the requirements of the Agreement. This process shall
consist of a series of tests,  the  "Acceptance  Tests" as  defined in  Appendix
"Acceptance   Tests",   which  demonstrate  the  Supplies  meet  the  guaranteed
specifications, the Acceptance Criteria.


<PAGE>   5


"Acceptance  Criteria"  mean the  guaranteed  specifications  of the Supplies as
defined in Appendix "Acceptance Criteria".

"Acceptance  Date"  means the date on which the Buyer  agrees  that based on the
Acceptance  Tests, the Supplies have met the Acceptance  Criteria . The Supplies
shall be deemed  accepted  when the Buyer and Seller  agree in writing  that the
Acceptance Tests have been successfully completed.

"Acceptance Tests" are the tests listed in Appendix "Acceptance Tests".

"Agreement" means this document and includes its Appendices.

"Buyer's Country" means the country where the Site is located.

"Day" means calendar day;  "Week" means  calendar  week;  "Month" means calendar
month.

When the last day of any period  prescribed  for the execution of any assignment
falls on a day which is not a working day in Belgium or in the Buyer's  Country,
the  assignment  may be  performed  on  the  first  working  day  following  the
aforementioned day.

"Effective Date" has the meaning set forth in Section entitled "Effective Date".

"Excusable  Delay"  has the  meaning  set forth in Section  entitled  "Excusable
Delay".

"Site" means the Buyer's facility in Buford, Georgia, USA.

"Supplies" means all equipment,  hardware, software (including installation) and
the  associated  documentation,  support  equipment  and services to be provided
under the Agreement, as detailed in Appendix "Cyclotron Parameters" and Appendix
"____________ Target Parameters".

<PAGE>   6



2. Subject Matter of Sale

Subject to the terms and conditions of this Agreement :

a) The Seller shall sell and deliver to the Buyer and the Buyer shall  purchase
from the Seller (i) a __________ model cyclotron,  the technical  specifications
of  which  are more  fully  described  in the  Appendix  "Cyclotron  Parameters"
Appendix hereto; (ii) _________________________ target system, the technical
specifications of which are more  fully  described  in the  Appendix
"__________________________ Target Parameters" hereto;  and (iii) a set of spare
parts listed in the Appendix  "Included  Spare Parts" hereto;

b) The Seller shall also assemble, install, start up, test, make operational and
perform the Acceptance Tests on the Supplies.

c) The  Seller  shall  send one of his  specialists  to assist in  bringing  the
cyclotron to full  operational  capacity after Acceptance of the Supplies by the
Buyer, as described in Section 25.

d) The Buyer and  Seller  agree  that an option  for  accelerated  delivery  and
acceptance as described in Appendix "Accelerated Delivery and Acceptance Option"
may be  exercised  by the Buyer.  In case that option is exercised by the Buyer,
the covenants of the "Accelerated Delivery and Acceptance Option" Appendix shall
be applicable to both parties.


3. Purchase Price of the Supplies

a) The  aggregate  purchase  price  (hereinafter  the "Price") of the  Supplies,
including  packaging,  insurance and transportation of the Supplies to the Site,
the  assembly,  testing and start up of the  Supplies  described  in the Section
entitled  "Subject  Matter  of  Sale"  above,  shall  be  ______________________
_______________________  This price shall also include the technical  assistance
by the Seller as  described in Section 25, the Spare Parts as listed in Appendix
"Included  Spare  Parts" and the Seller's  contribution  to the  applicable  USA
customs duty as stated in Section 11 of this Agreement.

b) As a down payment  equivalent to  ____________ has  been made by the Buyer to
the Seller on November 6, 1996, the balance of the Price set forth in subsection
a) shall be payable as follows:


<PAGE>   7


     i) ___________  ____________________________________________________  to be
paid to the Seller upon execution of this Agreement;

     ii)  ___________________________________________________________ to be paid
to the  Seller  on  March 1,  1997.  This  payment  shall  be  guaranteed  by an
irrevocable  standby  letter of credit to be issued in favor of and  approved by
the Seller within one month from the Effective Date.

     iii)_____________________________________________________________   to   be
paid to the Seller on  ______________.  This payment  shall be  guaranteed by an
irrevocable  standby  letter of credit to be issued in favor of and  approved by
the Seller by March 1, 1997.

     iv)_____________________________________________________  to be paid to the
Seller  within 15 days from  shipment of the Supplies as evidenced by receipt of
the  shipping  documents  and no later  than  March 1, 1998 if the  shipment  is
delayed by Buyer's  fault.  This payment shall be  guaranteed by an  irrevocable
standby  Letter of Credit to be issued in favor of and approved by the Seller by
the date of shipping of the  Supplies,  to be notified by Seller to the Buyer at
least 30 days in advance.

     v)_________________________________________________________  to be  paid to
the Seller within 15 days of the Acceptance of the Supplies.  This payment shall
be guaranteed by an  irrevocable  stand-by  Letter of Credit,  which can only be
exercised  during  the  year  following  the  delivery  of  the  Supplies,   and
conditioned  only  upon  successful  completion  of  the  Acceptance  Tests  and
providing  further  that,  in the event the Seller is  prevented  by the Buyer's
fault,  by a delay  on the  part of the  Buyer,  or by a  regulatory  body  with
jurisdiction over the Buyer from completing the Acceptance Tests for a period of
sixty (60) days or more,  payment  thereunder  to the Seller  shall be made upon
demand of the  Seller.  This  Letter  of Credit  shall be issued in favor of and
approved by the Seller,  such approval not to be unreasonably  withheld,  by the
date of  shipping  of the  Supplies,  to be notified by Seller to Buyer at least
thirty days in advance.

c) All  payments  by the Buyer to the Seller  under this  Agreement  shall be in
Belgian Francs and,  except those  specified in paragraph 3. b) above,  shall be
made by wire transfer within thirty (30) days from the date of invoice.


<PAGE>   8


d) All  payments  by the Buyer to the Seller will be deemed to have been made by
the Buyer on the date on which  the  Seller  has been  credited  for the  proper
amounts.  Any payment due to the Seller  which is not paid on the due date shall
accrue  interest for each started  month of delay at an annual rate of one point
above  the rate of the  "Avance  en Compte  Courant  Hors  Plafond  de la Banque
Nationale de Belgique" as published in "l'Echo" on the first day of such month.


4. Title and Risk of Loss

Except as indicated  below in this  paragraph,  title to the  Supplies  shall be
transferred  from the Seller to the Buyer when and to the  extent  payments  are
received by the Seller.  The Buyer  represents  and  warrants  that it shall not
cause or permit to be caused  any lien or  encumbrance  of any kind to be placed
upon the  Supplies  to an  extent  greater  than its share of  ownership  in the
Supplies.  It is  understood  that if the  Seller is unable to  demonstrate  the
Supplies  meet  the  Acceptance  Criteria  within  one year of  delivery  of the
Supplies to the Buyer's Site, clear title to the Supplies transfers to the Buyer
without  obligation to pay to the Seller the final payment  specified in Section
3.b.v unless the Seller has been prevented from conducting the Acceptance  Tests
as described in Section 8, last paragraph.

Risk of loss of any part of the Supplies shall pass from the Seller to the Buyer
upon delivery of such parts to the Site.


5. Delivery

The  Seller  shall  deliver  the  Supplies  to the Buyer at the Site and set the
Supplies in their final location.


6. Installation of Supplies

a) The assembly and  installation of the Supplies at the Site and the Acceptance
Tests are  planned to be  completed  by  _________________________________ after
completion  of  Site  preparation  by  the  Buyer  at  the  Seller's  reasonable
satisfaction  as  evidenced  by  an  acceptance  document  of  the  Site  ("Site
Acceptance  Document")  signed by the  Seller,  whichever  is later.  The Seller
undertakes to make its best efforts to complete the installation and testing

<PAGE>   9


within this period.  During the  installation  period the Buyer shall permit the
Seller's  employees,  subcontractors  or  agents  unlimited  access  to the Site
provided said  individuals  comply with policies and procedures  established for
the Buyer's employees regarding such matters as health and safety issues.

b)  With  reasonable  notice  to  the  Seller,  the  Buyer  and  its  authorized
representatives  shall,  during reasonable working hours, be free to inspect the
quality and  conditions of the Supplies at the Seller's site during  fabrication
and at any time upon arrival of the same at the Site and during the installation
period.  The Seller will notify in writing to the Buyer when the major materials
are available for construction of the cyclotron.

c) The Buyer at its sole expense shall  provide the Seller with closed  premises
on or reasonably  near the Site in which the Seller may store employee  clothing
and tools and equipment required for the installation.  However,  the Buyer does
not assume any risk with respect to the loss or theft of any such items while on
the Buyer's premises.

d) The Buyer shall,  at its sole expense,  provide the Seller with the following
utilities  required for installation of the Supplies and Acceptance Tests on the
Supplies:  electricity,  water,  compressed  air,  dry  nitrogen for venting the
vacuum  chamber,  hydrogen  gas for the ion  source,  as  described  in Appendix
"Building Requirements".  Access to telephone and fax equipment connected to the
international network is required and the Seller will pay the charges associated
with the use of this line.  The Buyer shall provide all the necessary  radiation
measuring  equipment  required for the operation and the Acceptance Tests on the
Supplies.

e) Within  fifteen  (15) days from the date of delivery of the  cyclotron at the
Site, the Buyer shall permit the Seller to produce beams at full energy and full
intensity in the cyclotron vault.

f) The Price  reflects labor  provided by the Seller.  Any  additional  labor or
costs  required by local labor codes,  etc.  will be the  responsibility  of the
Buyer.

g) The Supplies are manufactured  according to Belgian technical  standards.  If
the Buyer requires compliance of the Supplies with specific technical standards,
these  technical  standards  must be notified by the Buyer to the Seller  within
seven weeks of the Effective Date. All additional costs related to making the

<PAGE>   10


Supplies  conform to those norms or specific  standards  shall be charged to the
Buyer.


7. Preparatory Work

a) The Buyer shall have the sole  responsibility,  at its sole expense,  for the
work required to prepare the Site for installation of the Supplies. The building
to house the Supplies and the systems  contained  therein  shall comply with the
specifications   detailed  in  Appendix  "Building  Requirements"  and  Appendix
"Building Completion Specifications". As soon as possible after completion, and,
at the  latest,  ________________  the  Seller  shall  prepare  for the  Buyer a
proposed  layout and prepare such other plans and  memoranda as are necessary to
transmit data to the Buyer's  architects and  engineers.  By  _____________  the
Buyer shall furnish to the Seller  drawings and plans for the Site including the
building and systems detailed in Appendix  "Building  Requirements" and Appendix
"Building  Completion  Specifications" in sufficient detail to enable the Seller
to judge  whether the Site will be  satisfactory  for the Supplies and will meet
the  specifications  detailed in Appendix  "Building  Requirements" and Appendix
"Building  Completion  Specifications".  Within four (4) weeks of the receipt of
this initial set of architectural and engineering drawings and plans, the Seller
shall provide the Buyer with  comments  thereon and detailed  information  as to
such modifications therein as the Seller deems necessary including such drawings
and  technical  documents  as may be  required  by the  Buyer  to  complete  the
installation of the cables,  cooling water and compressed air systems.  However,
the time devoted to preparation by personnel of Seller of additional  layouts or
drawings  and/or  reviews  of  revised  sets of  architectural  and  engineering
drawings will be invoiced at Seller's  regular rates. No additional  charge will
be made for telephone  consultations.  Travel and related expenses incurred as a
result of attendance by personnel of the Seller  required at meeting  outside of
Belgium   with   the   Buyer's   architects,   engineers,   consultants   and/or
representatives  will be reimbursed by the Buyer. With respect to the foregoing,
the  responsibility  for  determining  whether  conflict  exists  between  local
building  codes and/or other laws or government  regulations  and the content of
drawings,  data sheets,  memoranda or other forms of communication  submitted by
the Seller is solely the responsibility of the Buyer, his architects,  engineers
and/or  consultants.  The  definitive  drawings and plans for the Site,  made in
accordance  with  the  Seller's  comments  and  recommendations,  will  then  be
furnished by the Buyer to the Seller by  ________________.  In addition,  unless
otherwise specified, the Buyer shall have the sole responsibility for the design
and construction of the radiation monitoring systems, of the shielding required

<PAGE>   11


to prevent  radiation leakage and of the systems required to handle the disposal
of radioactive waste.

Any delay on the part of the Seller in meeting its  obligations  related to this
Section  by more  than ten (10)  days  will add a number  of days to the  period
provided for the  performance  by the Buyer equal to the number of days of delay
by the Seller.

b) Before  commencing  installation,  the Seller shall  inspect the Site and the
Buyer shall  submit to the Seller the Site  Acceptance  Document to be signed by
the Seller confirming that the preparatory work meets all the criteria set forth
in the Section entitled  "Installation of Supplies",  paragraph c) and d) and in
Appendix   "Building    Requirements"   and   Appendix   "Building    Completion
Specifications".   This   acceptance   document  only   indicates  the  Seller's
willingness to begin the  installation of the Supplies in the Buyer's  building.
It  does  not  discharge  the  Buyer  and  his  subcontractors  of any of  their
responsibilities   regarding  the  building.   The  Buyer  shall   complete  the
preparatory work at the Site by ____________. If the preparatory work as regards
the cyclotron vault is substantially completed before that date, the Buyer shall
accept  delivery  and/or  installation of the Supplies as soon as possible under
the applicable  laws and  regulations.  In the event that such work has not been
completed  before that date,  or if for any other  reason the Buyer is unable to
accept delivery of the Supplies or commencement of the  installation  thereof by
that date,  the Buyer shall  immediately  give the Seller written notice of this
fact and the anticipated new date for completion of the preparatory work. In any
case,  the Seller may ship the  Supplies  to the Buyer at any time and the Buyer
shall store them in one of its warehouses until the date the preparatory work is
completed.

c) One week before  commencing  installation and setting of the cyclotron in its
vault,  the Buyer shall allow the Seller  full  access to the  cyclotron  vault,
power supplies and control room and all other rooms related to the  installation
of the Supplies to allow for the measurement of line-up marks to be performed.

d) The Buyer's completion,  to the reasonable satisfaction of the Seller, of its
undertakings  in this  section  and  elsewhere  in this  Agreement  relating  to
preparation of the Site and the continuous  furnishing of necessary services and
permits set forth in the Section entitled "Installation of Supplies",  paragraph
c), d) and e) and in Section entitled "Custom Duties,  Buyer's Country Taxes and
Import  Permits"  and  the   requirements   detailed   in   Appendix   "Building

<PAGE>   12


Requirements"  and  Appendix  "Building  Completion  Specifications"  shall be a
condition precedent to the Seller's commitment to perform within the time period
specified under the Section entitled  "Installation of Supplies" hereof, and any
delay or  interruption  by the  Buyer in  meeting  its  obligations  under  this
Agreement in a timely  fashion  shall extend the Seller's  time to perform under
this  Agreement  including  but not  limited to Seller's  time to  exercise  and
perform under the option for  accelerated  delivery and  acceptance  outlined in
Appendix  "Accelerated Delivery and Acceptance Option", by a period equal to the
period of the Buyer's delay or interruption plus, if shipment and/or delivery is
delayed by Buyer's  fault or at Buyer's  request,  an  additional  period not to
exceed four weeks to reschedule  shipment and/or delivery of the Supplies and/or
personnel as may be required.

In the event of any such delay or  interruption,  the Buyer will  reimburse  the
Seller for any  reasonable  costs  incurred as a direct  result of such delay or
interruption.  Additionally,  if such  postponement or  interruption  delays the
Buyer's  obligation  to make any of the payments  set forth in Section  entitled
"Purchase Price of the Supplies", paragraph b) hereof, interest will be computed
for each  started  month of delay at an annual  rate one point above the rate of
the "Avance en Compte  Courant Hors Plafond de la Banque  Nationale de Belgique"
as published in "l'Echo" on the first day of such month.

If all the  conditions  necessary  for the  Seller  to sign the Site  Acceptance
Document  referred  to in the  above  Section  have  not been met at the time of
delivery of the Supplies,  the Seller will  nonetheless make its best efforts to
start the  installation  of the Supplies as soon as reasonably  possible and the
Buyer will give the Seller any reasonable  support to allow the Seller to do so.
However,  beginning of installation of the Supplies in the building,  under such
conditions,  will under no circumstances be considered as implicit acceptance of
the Site by the Seller.


8. Acceptance

On the date set by the Seller for the conduct of the  Acceptance  Tests,  and in
the presence of the Buyer's  representatives,  the Seller shall begin to conduct
the agreed-upon Acceptance Tests.

Not more than twenty four (24) hours following the completion of such tests, the
Buyer shall either accept the Supplies as conforming to the  requirements of the
Agreement by issuing an acceptance certificate "Acceptance Certificate"

<PAGE>   13


acknowledging  that  decision,  or advise  the Seller in writing of the extent 
to which the Supplies do not meet the requirements of the Agreement.

The Buyer shall not withhold the issue of the Acceptance  Certificate on account
of minor omissions or defects in the Supplies which do not substantially  affect
their use but may designate in the Acceptance  Certificate such minors omissions
or defects. The Seller shall promptly make good these omissions or defects.

If the Buyer does not give notice within the period  stipulated above, or begins
using the  Supplies for its own use,  such tests shall be deemed  satisfactorily
completed,  the Acceptance  Certificate  shall be deemed issued on that date and
the related  acceptance  payment shall be paid to the Seller within 15 days from
that date.

If  the  Buyer   gives  the  Seller   notice  that  such  tests  have  not  been
satisfactorily  completed,  the  Seller  shall  make  such  adjustments  as  are
necessary  and  repeat  the   Acceptance   Tests  until  the  Buyer  deems  them
satisfactory pursuant to the terms set out above.

Until  ______________  the Seller shall have unimpeded access to the Supplies to
complete the Acceptance Tests. If the Seller is unable to successfully  complete
the Acceptance Tests by  _____________,  the Buyer shall be free to begin use of
the  Supplies  forty five (45) days later.  Should the  Supplies be put into use
under this  condition,  it is  understood  the Buyer and Seller will make a good
faith effort to facilitate  the completion of the  Acceptance  Tests,  but it is
further  understood that the Buyer's production of Pd-103 with the machine takes
precedence.  The Buyer agrees to allow the Seller three (3) prescheduled days of
unimpeded   access  to  the  Supplies  per  month  during  the  period  between,
_____________ until  the period for  acceptance  has  expired  as  specified  in
Section 4 "Title and Risk of Loss".

If a dispute  arises  between  the Buyer and the Seller  concerning  whether the
Acceptance Tests have been successfully  completed or concerning the issuance of
the  Acceptance  Certificate,  the Buyer and the Seller  will  jointly  agree to
obtain the services of the American Arbitration Association ("AAA") to arbitrate
the dispute,  as described in Section 29  hereafter.  Both parties will abide by
AAA's recommendations.


<PAGE>   14


If the Seller is prevented  either by the Buyer or by any  regulatory  body that
has juridiction over the Buyer from conducting the Acceptance Tests for a period
of sixty (60) days,  the Buyer  shall be deemed to have  accepted  the  Supplies
sixty  (60) days  after the  Seller  was first  prevented  from  conducting  the
Acceptance  Tests. If the Seller is prevented by force majeure or events similar
to  those  enumerated  under  Section  "Excusable  Delay"  from  conducting  the
Acceptance  Tests, the Buyer shall pay 50% of the Acceptance  payment as defined
in Section 3 b) v). In either  case the Seller  shall  complete  the  Acceptance
Tests within the period remaining at the time the impediment began.


9. Transportation and Insurance

Seller shall at its own expense :

i) Obtain appropriate  property and liability  insurance covering loss or damage
to the Supplies  and  injuries to  individuals  during the  construction  of the
Supplies and during the  transportation  of the Supplies from the Seller's plant
to the Site.

ii) Pay all freight and other transportation charges associated with delivery of
the Supplies to the Site, and have a representative  present during the transfer
of the Supplies from the port of entry to the Site.

iii) Maintain worker's compensation insurance during the assembly,  installation
and testing of the  Supplies,  as  required  by  applicable  law,  covering  its
employees  and,  upon request  from Buyer,  provide a  certificate  of insurance
evidencing such coverage.

Buyer shall at its own expense:

i) Obtain appropriate  property and liability  insurance covering loss or damage
to the Supplies  between  delivery of the Supplies at the Site and the time when
the  Seller  has  been  paid in full  for the  amounts  under  Section  entitled
"Purchase Price of the Supplies". In such insurance policies, both the Buyer and
the Seller shall be named as insured parties.

ii) Arrange for the  destruction,  pick-up  and/or  clearing  away of all waste,
including the Supplies  packaging  except for the disposal of radioactive  waste
which is covered in section 12 of appendix "Building Completion Specifications".


<PAGE>   15


The Buyer and the Seller  shall each take out and  maintain at their own expense
during the period from receipt of the  Supplies at the Site through  Acceptance,
insurance to provide  coverage for both itself and the other party for an amount
of at least one million US dollars  (US$  1,000,000)  per  accident  against any
direct and indirect liability for bodily injury and death to individuals and all
direct or  indirect  costs,  losses  and  damages to the  property  of the other
arising  out of  each  other's  acts  or  omissions  in  unloading,  assembling,
installing and testing of the Supplies.


10. Export Documents, Duties and Foreign Taxes

The Seller will be  responsible  for obtaining all necessary  export  permits or
licences  relating  to the  Supplies  and the Buyer will  offer such  reasonable
assistance  in this regard as the Seller may  request.  The Seller shall pay any
and all export  duties and all other taxes  required  to be paid  outside of the
Buyer's Country in connection with the sale of the Supplies.


11. Customs Duties, Buyer's Country Taxes and Import Permits

The Buyer  shall pay all sales,  use,  gross  receipts,  excise and other  taxes
assessed  or levied by the  Buyer's  Country or any other  taxing  jurisdiction,
state or local,  within the Buyer's  Country,  against the Buyer  (including any
fines, penalties and interests thereof) as a result of or in connection with the
sale, use, delivery, storage or transfer of the Supplies.

The Seller agrees to equally share with the Buyer the cost of the import customs
duties levied by the customs authorities of the USA at the entry of the Supplies
into the USA, up to a maximum  cost for the Seller  equal to two percent (2%) of
the price of the Supplies.

The Buyer shall be responsible  for obtaining all necessary  permits or licences
with respect to the  importation of the Supplies in the Buyer's  Country and the
installation  and use of the Supplies at the Site, and the Seller will offer the
Buyer such reasonable assistance in this regard as the Buyer may request.


12.  Warranty As To Title

The Seller warrants good title to the Supplies.



<PAGE>   16



13. Design and Performance Warranty

The Seller hereby  warrants  that the Supplies  will perform in accordance  with
applicable  design  and  performance   specifications   set  forth  in  Appendix
"Cyclotron Parameters" and in Appendix ____________ Target Parameters for a
period of one (1) year after the  Acceptance  Date. The Seller shall resolve any
design flaws appearing during the first year following the Acceptance of the
Supplies.


14. Material and Workmanship Warranty

The  Seller  hereby  warrants  that the  Supplies  will be free from  defects in
material  and  workmanship  for a  period  of one  (1)  year  from  the  date of
acceptance of the Supplies by the Buyer or fifteen (15) months from the date the
Supplies are put in their final  location in the Buyer's vault if the Acceptance
Date is delayed at the Buyer's  request or through the Buyer's fault,  whichever
period is shorter: provided,  however, that this warranty shall not apply to ion
source stamped cathodes and chimneys,  puller electrodes,  air filters, targets,
oil for the vacuum  pumps,  demineralizing  column,  gas bottles (H2 for the ion
source, N2 for  venting,...),  and other  consumables;  that the Seller makes no
warranty with respect to failures notified after the warranty period or failures
during operation without logging or failures due to alteration, misapplications,
abuse, abnormal conditions of temperature,  dirt, corrosive matter,  maintenance
not  carried  out  according  to the  Seller's  instructions,  lack  of  trained
personnel for maintenance,  operation above rated capacities either  intentional
or otherwise,  or in an otherwise  improper  manner or physical damage caused by
persons  other than  employees or agents of the Seller;  that the Seller's  sole
liability  under valid  warranty  regarding  claims for defects in material  and
workmanship is limited, at the option of the Seller, to repair or replacement of
the defective parts; that with respect to components purchased by the Seller for
incorporation into the Supplies  essentially  without  modification,  the Seller
makes no  warranties  of its own but  assigns  to the  Buyer  the full  warranty
extended to the Seller as part of the original purchase of the component.

If, due to a fault of the Seller,  the Supplies  have not passed the  Acceptance
Tests by _______________,  the  Seller's  warranty  shall start and be in effect
until ______________.


<PAGE>   17


The Seller  shall  bear the cost and risk of loss  during  transport  of (i) any
defective  part or components  being  returned to the Seller's  factory with the
Seller's  agreement and (ii) any repaired or replacement  item being returned to
the Buyer.  Products or parts returned without the agreement of the Seller shall
be at the Buyer's  sole risk and expense.  The Seller  shall bear any  personnel
costs incurred in connection  with the  fulfillment of the Seller's  obligations
under this warranty.

The foregoing warranties are exclusive and are given and accepted in lieu of all
other warranties of quality written or oral,  express or implied,  and all other
warranties are hereby disclaimed.


15. Logging of Operations

The Buyer shall keep a logbook of operation  for the  Supplies.  In this logbook
shall be  documented  all  sessions of  operation of the Supplies as well as any
problems  encountered  during  operation of the Supplies.  If the Buyer requests
assistance  from the Seller in  resolving a problem  with the  Supplies  and the
information in the log is relevant to this resolution, the Buyer may at its sole
discretion  make the log available to the Seller . If the Buyer presents a claim
against the  warranty  provided  by the  Seller,  a copy of the log must be made
available to the Seller.  It is  understood  by the Seller that the  information
contained in the Log may be of a proprietary  nature and is therefore covered by
the confidentiality agreement between the parties.


16. Training

The Seller agrees to provide up to two days of training in __________ operation,
preventative  maintenance and repair to the Buyers' personnel at the Site during
or immediately after the installation  period, with the exact dates and times to
be mutually  agreed by the Buyer and Seller.  The cost of such training shall be
the responsibility of the Seller.


17. Disclaimer of Liability for Personal Injury

The Seller and the Buyer hereby acknowledge that the products,  as offered,  are
highly sophisticated devices which should be operated only by trained personnel;
that it is the Buyer's  sole  obligation  to retain and train such  personnel or
have it trained, possibly by the Seller; that, where necessary, the Supplies

<PAGE>   18


contain  interlocking  devices  designed to prevent their  operation in a manner
which  would  cause  injury  to such  personnel,  but as in the  case  with  all
equipment  utilizing  high  voltages,  such  personnel  should  assume  that the
interlocking  devices are  inoperative and should take  appropriate  measures to
ensure that the voltage  has been turned off prior to begin  working  where high
voltage is present during the start up and/or operation of the Supplies; that it
is inherent in the  operation of the  Supplies  that  portions  thereof may emit
dangerous  ionizing  radiation  and may become  activated  during  their  normal
operation;  that it is the Buyer's sole  obligation  to  determine  the level of
radioactivity,  to ensure that a system exists for determining and recording the
levels of  radioactivity  and to ensure that no personnel  or other  persons are
exposed to radiation in excess of that permitted by relevant law or regulations.

Based upon the  foregoing  acknowledgments,  it is,  therefore,  agreed that the
Seller shall not incur any  liability  for personal  injury to any party arising
out of the operations and  maintenance of the Supplies  unless such liability is
solely  caused by a gross  negligence  on the part of the Seller in the  design,
implementation  or  documentation  including but not limited to maintenance  and
operation manuals for the Supplies. In order to give effect to these limitations
of the Seller's liability, and as an express condition of sale, the Buyer hereby
agrees to indemnify and hold the Seller  harmless  from any and all claims,  but
limited by the  exclusion  of  negligent  acts or  omissions  as outlined in the
preceding sentence, damages and liability, including reasonable attorney's fees,
arising  out of a claim  against the Seller for  personal  injuries of any party
occasioned by the operation and/or maintenance of such Supplies.


18. Liability for Consequential Damages

The Seller's  liability to the Buyer for damages howsoever caused shall under no
circumstances  whatsoever  (including  the decision of an  arbitration  panel or
court of law)  exceed  the  payments  actually  received  by the  Seller for the
Supplies  and the Seller shall under no  circumstances  have any  liability  for
special,  incidental,  indirect  or  consequential  damages,  including  without
limitation liability for loss of use, loss of profits, damage or injury to other
property or persons.



<PAGE>   19



19.  Infringement of Proprietary Rights

a) The Seller shall  indemnify  and hold  harmless the Buyer against any and all
losses,  liabilities  and  expenses,  by reason of any third party claim,  suit,
action or proceeding for alleged  infringement  of any  copyright,  trademark or
patent  of the  Buyer's  Country  or  alleged  conversion  of any  trade  secret
resulting from or arising in connection with the manufacture,  installation, use
or sale of the Supplies or any part thereof  including  any and all judgments or
decrees which may be rendered against the Buyer (and reasonable  attorney's fees
if Seller  should  fail to defend as  provided  in  subsection  b)  hereof,  and
settlements  made  arising out of any such  claim,  suit,  action or  proceeding
provided,  however  that this  indemnity  shall not  extend to any  infringement
resulting  from a breach  by the  Buyer  of this  Agreement  or of the  Seller's
instructions for the operation of the Supplies.  The Seller shall however not be
liable for any  infringement  or claim based upon the use of the Supplies or any
portion of the  documentation  in combination with other equipment or technology
not supplied by the Seller or resulting from any modification made by the Buyer,
without approval or instruction by Seller.

b) The Seller shall defend at its own expense all suits,  actions or proceedings
brought  against the Buyer with respect to the matters  listed in  subsection a)
above. The Buyer shall have the right at its option and at its sole expense,  to
participate  in the  defense  of any such  claim,  suit,  action or  proceeding,
without  relieving  the  Seller of any  obligation  hereunder.  The Buyer  shall
promptly  notify the  Seller in writing  after any such claim is made or suit is
brought and shall  cooperate with Seller in the defense  thereof as requested by
the Seller,  and the Seller  agrees to  reimburse  the Buyer for its  reasonable
out-of-pocket  expenses incurred at Seller's specific request in connection with
such  cooperation.  The  Buyer  shall  immediately  notify  the  Seller  of  any
infringement  claim made or  threatened  and shall refrain from any admission of
liability,  and will not  negotiate  or enter into any  settlement  without  the
Seller's prior consent.

c) If,  however,  as a  consequence  of a final  determination  of any  suit for
infringement  or any court decision  involving any injunction  resulting from or
arising in connection  with the  manufacture or sale of the Supplies or any part
thereof furnished or employed by the Seller hereunder,  the Buyer is enjoined or
limited  in any  material  manner in the use of said  Supplies  or part,  Seller
shall,  at its option and at its own expense either i) procure for the Buyer the
right to continue use of said Supplies or part, ii) so modify the Supplies or

<PAGE>   20


part so as to render them  non-infringing  without any significant effect to use
thereof, or iii) replace the Supplies or part with an equivalent  non-infringing
product.


20. Seller's and Buyer's Proprietary Information

Upon completion of the Acceptance  Tests,  the Seller shall furnish to the Buyer
free of charge  information,  manuals  and  drawings  in English and with metric
units of measure  relating  to the  Supplies  and  instructions  to the Buyer in
sufficient  detail to enable the Buyer and its employees to operate,  calibrate,
maintain and repair the Supplies and all parts thereof.  A definitive version of
the documentation,  including the modifications that are specific to the Buyer's
configuration and that are made during the final stages of installation, will be
provided six (6) months after the  completion  of the  Acceptances  Tests.  Such
information,  manuals,  drawings  and  instructions  and the  written  materials
furnished  by the Seller to the Buyer  under the Section  entitled  "Preparatory
Work"  hereof shall remain the property of the Seller and the Buyer shall have a
royalty-free  license  to  use  the  same  in  connection  with  the  operation,
calibration, maintenance and repair of the Supplies. The Buyer shall not use any
of the proprietary information supplied by the Seller for any other purpose than
the operation, calibration, maintenance and repair of the Supplies and the Buyer
shall not register, apply for registration or attempt to acquire any other legal
protection  for the said  proprietary  information in its own name, or any other
name,  or take any  action  which may  affect  the  Seller's  rights,  title and
interest in and to the  technology in any country,  without  obtaining the prior
consent of the Seller.  The Buyer shall treat such  information and materials in
the same  manner  as it  treats  its own  proprietary  information  and will use
similar  means to  protect  it from  unauthorized  disclosure.  The  same  Buyer
covenants and agrees that the contents of such written  information or materials
shall  not be  divulged  to any other  person,  firm or  corporation,  except as
allowed above.

The Seller agrees that all  information  transmitted  from Buyer to Seller under
this contract  including but not limited to,  information  relating to research,
development, manufacturing, testing, accounting and marketing will be considered
confidential  information.   This  confidential  information  will  be  held  in
confidence and not disclosed to third parties by the Seller.  This  confidential
information  shall be held in  confidence by the Seller using the same degree of
care as the Seller uses in  protecting  its own  confidential  information.  The
Seller shall only use such  confidential  information for the purpose of meeting
its obligations under this Agreement.



<PAGE>   21



21. Destruction of Supplies

In the event that prior to the delivery of the Supplies,  the Supplies are lost,
destroyed  or  damaged  to such an extent  that  they  cannot  be  repaired  and
delivered  in  accordance  with the  delivery  schedule set forth in the Section
entitled "Installation of Supplies",  provided the event is not a willful act of
the Seller, the time reasonably  required by the Seller to furnish a replacement
for the  Supplies or to  accomplish  such  repairs  shall be deemed an Excusable
Delay under the Section entitled  "Excusable  Delay" and the Seller shall not be
deemed to be in default or to have breached its duties hereunder.



22. Excusable Delay

Notwithstanding anything to the contrary herein contained, if the performance of
this  Agreement  by any  party  or the  obligation  of any  party  hereunder  is
prevented,  restricted  or  interfered  with by reason of : i) fire,  explosion,
strike,  lockout,  labor  dispute,  casualty  or  accident,  epidemic,  cyclone,
drought,  flood or ii) war,  revolution,  riot, civil commotion,  acts of public
enemies,  blockage  or  embargo,  or iii) any law or  proclamation,  regulation,
ordinance, demand or requirement of any applicable government or any subdivision
thereof  or  representative  of any  such  government,  or iv)  any  other  acts
whatsoever,  whether  similar  or  dissimilar  to those  enumerated,  beyond the
reasonable  control of a party  hereto,  then,  and in that event,  the party so
affected  shall  promptly  notify the other  party of all  reasonable  resulting
difficulties.  Upon such notice,  the disabled party shall,  for the duration of
its disability (referred to as "Excusable Delay" in this Agreement),  be excused
from the performance of such of its obligations as are prevented, restricted, or
interfered  with  by  reason  of the  occurrence  of any  of  the  events  above
enumerated  and such  party  shall  not be deemed to be in  default  under  this
Agreement  nor be subject to any  liability  or damage.  The time period  during
which any party is to perform  under this  Agreement  shall be  extended  by the
period of any Excusable Delay. Excusable Delay under the same terms occurring in
respect to the Seller's  sub-contractors  shall be deemed to be Excusable  Delay
occurring to the Seller.

If the Seller is prevented from proceeding according to any of the schedules set
out in this Agreement by the Buyer's fault, by a delay on the part of the Buyer,

<PAGE>   22


or by regulatory body with  jurisdiction  over the Buyer's site, or if the Buyer
delays a payment or the issuance of a Letter of Credit  pursuant to Section 3 by
more than fifteen (15) days past the due date,  then all the dates  contained in
this  Agreement  for  completion  by the Seller of its  obligations  and rights,
including but not limited to the right to exercise the accelerated  delivery and
acceptance  option,  shall be  postponed  by an  additional  period equal to the
delay.


23. Termination for Insolvency

In the event that either the Buyer or the Seller :

a) makes a general assignment for the benefit of creditors or becomes insolvent;

b) files an insolvency petition in bankruptcy ;

c) petitions for or acquiesces in the  appointment  of any receiver,  trustee or
similar officer to liquidate or conserve its business or any substantial part of
its assets ;

d) commences,  under the laws of any jurisdiction,  any proceeding involving its
insolvency,  bankruptcy,   reorganization,   adjustment  of  debt,  dissolution,
liquidation  or any other  similar  proceeding  for the  release of  financially
distressed debtors ; or

e) becomes a party to any proceeding or action of the type described above in c)
or d) and such proceeding or action remains undismissed or unstayed for a period
of more than sixty (60) days,


then the other party may, by written notice, terminate this Agreement.


24. Spare Parts

The Seller agrees to make available to the Buyer,  as the Buyer may from time to
time require,  _____________________ spare parts and components to the Supplies,
and the Seller agrees to exert  reasonable  efforts to meet the Buyer's delivery
requirements  for said parts and  components  or acceptable  substitutes.  It is
understood  that the  parties  shall  negotiate  in good  faith  reasonable  and
mutually agreeable prices for said spare parts and components.



<PAGE>   23



25. Technical Assistance by the Seller

Immediately  following the  successful  completion of the  Acceptance  Tests the
Seller  shall send one of its  specialists  to assist the Buyer in bringing  the
cyclotron to full  operational  capacity.  The  specialist  shall be the project
coordinator  or, if he is not  available,  someone of equal or better  technical
expertise,  this other person to be approved by the Buyer,  such approval not to
be unreasonably  withheld. The Seller's specialist will remain at the site for a
period of 28 days unless the Buyer  agrees that the  services of the  specialist
are no longer required.  During this period,  the Buyer's specialist will define
the tasks to be  performed  by the  Seller's  specialist  with the  objective of
verifying  the  cyclotron  1) is fully  operational,  2) performs  according  to
specifications  within the production  environment and 3) its automated  control
system performs according to specifications. This period of technical assistance
does not relieve the Seller of any of its warranty  obligations,  including  the
requirement  that the Seller  send any  personnel  required  to the Site to make
repairs  should the  Supplies  be found to not meet  specifications  during this
period.


26. Entire Agreement

This Agreement,  made in two originals,  one for each party, contains the entire
agreement  between the parties and shall  supersede all previous  communications
and  agreements,  whether oral or written,  with  respect to the subject  matter
hereof and the provisions  hereof may not be modified or superseded except by an
instrument in writing signed by a duly authorized  officer or  representative of
each of the parties hereto.


27. Authorization

By virtue of having  affixed  their  respective  signatures  below,  each of the
parties  hereto  warrants  that it has obtained all  authorization  necessary to
enter into and perform its obligations under this Agreement.


28. Effective Date

This Agreement  shall become  effective as of the date upon which payment i), as
set forth in Section entitled  "Purchase Price of the Supplies",  is received by
the Seller.



<PAGE>   24



29. Disputes

With respect to any  controversy  arising out of or relating to this  Agreement,
such controversy shall be settled by final and binding  arbitration in New York,
NY,  USA,  in  accordance  with the  then-existing  rules (the  "Rules")  of the
American Arbitration Association ("AAA") and judgment upon the award rendered by
the  arbitrators  may be  entered  in any  court  having  jurisdiction  thereof;
provided,  however,  that the law applicable to any  controversy  and the law by
which this  Agreement  shall be construed  and governed  shall be the law of the
State  of New  York,  regardless  of its or  any  jurisdiction's  choice  of law
principles.  In any  arbitration,  pursuant  to this  Agreement,  the  award  or
decision  shall  be  rendered  by a  majority  of  the  members  of a  Board  of
Arbitration  consisting of three (3) members,  one of whom shall be appointed by
each  party  and the  third of whom  shall be the  Chairman  of the panel and be
appointed by mutual agreement of said two  party-appointed  arbitrators.  In the
event of failure of said two  arbitrators  to agree upon the  appointment of the
third  arbitrator   within  sixty  (60)  days  after  the  commencement  of  the
arbitration  proceeding,  the third  arbitrator shall be appointed by the AAA in
accordance  with the Rules. In the event that either party shall fail to appoint
an arbitrator  within thirty (30) days after the commencement of the arbitration
proceeding,  such arbitrator and the third  arbitrator shall be appointed by the
AAA in  accordance  with the  Rules.  The  Rules of  Evidence  and the  Right to
Discovery shall be applicable to both parties.

Work under this Agreement shall continue during the arbitration  proceedings and
payments due to the Seller shall not be withheld on account of such  proceedings
unless such  particular work or payment is the subject matter of the arbitration
in which case this provision shall not apply to such particular work or payment.

The parties agree to equally share the expenses associated with this arbitration
procedure.


30. Governing Laws

This Agreement  shall be governed by and construed in all respects in accordance
with the laws of the State of New York, USA.



<PAGE>   25



31. Notices

a) Any notice  given under this  Agreement  shall be made in  writing,  shall be
given by first class air mail,  telex,  telecopier or commercial cable and shall
be addressed to :

In the case of the Seller:
      Ion Beam Applications
      Chemin du Cyclotron, 3
      1348 Louvain-la-Neuve
      Belgium
      Attn : Mr. Yves Jongen
      Fax Number : 32-10-47.58.10

In the case of the Buyer :
      Theragenics Corporation
      5325, Oakbrook Parkway
      Norcross, GA 30093
      USA
      Attn : Mr. Glenn Dill
      Fax Number : 1 (404) 381 84 47

Either party,  by written  notice to the other,  may change the address to which
notices will be directed.

b) Any notice shall be deemed given on the date personally  delivered or sent by
telex,  telecopier or cable and fifteen (15) days after the date of mailing,  if
mailed.


32. Project Coordinator

Upon signing this Agreement,  both parties shall designate a representative  who
will act as Project  Coordinator  and official  addressee for all  communication
resulting from this  Agreement,  other than any official  notice given under the
Section  entitled   "Notices".   All  requests  for  service,   transmittals  of
information,  reports on training  activity,  and other  communication  required
under this  agreement  shall be sent by and directed to the  respective  Project
Coordinators. Informal conversations occurring person-to-person or by phone,

<PAGE>   26


requests and  information  shall be validated by an appropriate  written form as
confirmation.  Any communication sent to others than those designated as Project
Coordinators,  or in a  manner  not in  accordance  with the  Notices  procedure
specified in this Agreement will be considered as informal and non-existent.


33. Assignment

This  Agreement  shall inure to the  benefit of and be binding  upon each of the
parties hereto and their  respective  successors and assignees,  but neither the
rights nor the duties of either party hereunder may be assigned,  in whole or in
part by either party, without the prior written consent of the other party. Such
consent shall not be unreasonably withheld by either party. Any assignment shall
not relieve the assignee of any of the Agreement obligations of the assignor.


34. Headings

The headings  contained  within this  Agreement are  established  solely for the
convenience  of the  two  parties  and  are not  intended  to and do not  limit,
construe or modify any of the terms and conditions included hereof.


35. Severability

If  any  term  or  provision  of  this  Agreement  is  held  to  be  illegal  or
unenforceable, then this Agreement, except for such part or parts thereof, shall
continue to be in full force and effect.

In the event of any  inconsistency  between a provision of the conditions of the
Agreement and the content of an Appendix to this  Agreement,  and if the parties
cannot  agree on the  clause to take  precedence,  the AAA of Section 29 will be
asked to  mediate/arbitrate  the dispute  and the parties  agree to abide by the
finding of said association.



36.  Non-Waiver

The failure by either party to enforce at any time or for any period of time any
of the  provisions  hereof shall not be a waiver of such  provisions  nor of the
right of such party thereafter to enforce each and every such provision.


<PAGE>   27


IN WITNESS  WHEREOF,  the parties  have caused this  Agreement to be executed in
duplicate by their duly qualified officers or representatives.

THERAGENICS CORPORATION Inc.

Not Required
Christine Jacobs
President

/s/ Bruce Smith                                      /s/ Glenn Dill
Bruce Smith                                          Glenn Dill
Chief Financial Officer

/s/ Yves Jongen                                      /s/ Sabine de Voghel
Yves Jongen                                          Sabine de Voghel
President                                            Area Sales Manager




<PAGE>   28

                                    APPENDIX

                              CYCLOTRON PARAMETERS

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission



                                                         METHOD OF VERIFICATION
 BEAM                                                   FOR THE ACCEPTANCE TESTS
                                                             not required
                                                             calculated
                                                             measured
                                                             rationale
                                                             calculated
 POWER CONSUMPTION                                         
                                                             measured
                                                             measured
 MAGNETIC STRUCTURE                                        
                                                             value provided
                                                             value provided
                                                             value provided
                                                             value provided
                                                             value provided
                                                             value provided
                                                             value provided





Theragenics/IBA Contract - Cyclotron #6 - _____________ - p.1
<PAGE>   29

The Seller agrees that if the Buyer develops at its own expense a
______________ to ___________, and if the device does not interfere or
compromise the functioning of this _______, the Seller will cooperate with the
Buyer to integrate this __________ into its design _________.


 R.F. SYSTEM
                                                                 value provided
                                                                 value provided
                                                                 value provided
                                                                 value provided
                                                                 value provided
                                                                 value provided
                                                                 value provided
                                                                 value provided
                                                                 value provided
 ION SOURCE                                                     
                                                                 verified
                                                                 value provided
 The Seller agrees to provide _______________________.





Theragenics/IBA Contract - Cyclotron #6 - _____________ - p.2

<PAGE>   30

 GENERAL DIMENSIONS
                                                                  value provided
                                                                  value provided
                                                                  value provided
                                                                  value provided
 WEIGHT                                                             
                                                                  value provided
 VACUUM SYSTEM
 The Buyer will make its best effort to have _____ whenever possible.

 CONTROL SYSTEM


 STRAY BEAM CONTROL


 WATER MANIFOLD
         The water manifold will be __________________________.





Theragenics/IBA Contract - Cyclotron #6 - _____________ - p.3
<PAGE>   31

                                    APPENDIX

                           ________ TARGET PARAMETERS

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission

                                                         METHOD OF VERIFICATION
 TESTS                                                      FOR THE ACCEPTANCE
                                                               calculated 
                                                               measured   
                                                               measured   
                                                               calculated 
                                                               specified  
                                                               specified  
                                                               measured*  


Notes:
         1)      It is understood the Seller will make its best effort to
                 ____________.

         2)      The Buyer understands the _______________ to be delivered is to
                 function at ____________.  The Seller will however consider
                 the possibility of ______________ and if this can be done at
                 _______________, will _________________.

* to be measured after completion of the Acceptance Tests





Theragenics/IBA Contract - Cyclotron #6 - _____________ - p.4
<PAGE>   32

                                    APPENDIX

                             BUILDING REQUIREMENTS

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission

 A.       RECOMMENDED ROOM CONFIGURATION


 1.       CYCLOTRON VAULT

 Inside dimensions:

 Recommended vault shielding:

 Floor loading:
 Floor drains:                   As required by local code & subject to health 
                                 safety rules

 Temperature limits:

 Humidity limits:
 Power dissipated in the air:

 Lifting eyebolts and anchoring points shall be installed in the vault
 according to IBA specifications, if required.


 2.       POWER SUPPLY AND CONTROL ROOM

 Inside dimensions:
 Temperature limits:

 Humidity limits:

 Power dissipated in the air:
 The door height for the insertion of the Supplies shall be more than 5 cm
 higher than that of the Supplies.

 Power supply, control and cyclotron rooms will be located close to each other
 to avoid long cables and shall not be more than 30 meters away from each
 other.


 3.       CYCLOTRON COOLING SYSTEM REQUIREMENTS

 The cooling system should be located as close to the cyclotron vault as
 possible, with access to a water supply.

A ___________ is sufficient to accommodate the heat exchanger, column and pump.





Theragenics/IBA Contract - Cyclotron #6 - _____________ - p.5
<PAGE>   33

 Locating the cooling system on a different level from the cyclotron's is
 possible to a maximum height difference of __________ the cyclotron median
 plane _____________.

 The area should be easily accessible for servicing the equipment.


 B.       SERVICES SPECIFICATIONS

 1.       ELECTRICAL POWER

 _________, other voltages possible if specified within two weeks of the time
 of order.  
 ______________.

 ______________.

 Voltage to be nominal ____________.
 
 Delivered to IBA's power distribution cabinet in the power supply room.

 The Buyer shall provide, install and terminate the power cables to the "mains"
 connection (AC power input) of all IBA power distribution cabinets in
 accordance with local electrical code requirements.


 2.       COOLING, SECONDARY LOOP

 Water requirements (chiller loop):

 Flow:

 Temperature:

 Power to be removed:

 D P:

 ____________ water has to be delivered in the cooling room ___________.
 Drains according to local building codes should be included.


 3.       COMPRESSED AIR

 Pressure:

 Quality:

 Average flow:

 Peak flow:

 Outlets must be provided.




                                      
Theragenics/IBA Contract - Cyclotron #6 - _____________ - p.6
<PAGE>   34

 4.       ____________ FOR CYCLOTRON VENTING

 Pressure:

 Quantity:


 5.       _____________ FOR THE ION SOURCE

 Pressure:

 Quantity:

 Quality:





Theragenics/IBA Contract - Cyclotron #6 - _____________ - p.7
<PAGE>   35

                                    APPENDIX

                       BUILDING COMPLETION SPECIFICATIONS

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission



The building shall be fully completed and shall have been accepted by the
Seller prior to the arrival of both the Seller's team and the equipment
necessary for the installation of the Supplies.  The Seller will start
installation work when the following conditions have been complied with to
Seller's reasonable satisfaction.

A "Site Acceptance Document" will be provided by the Seller to the Buyer and
will list the mutually agreed progress of the site reaching specification.

1.       CONCRETE

All concrete must cure for at least ________ prior to arrival of the Supplies
and related equipment in order to avoid _______________ problems.


2.       PIPES AND CABLES

All conduits, cable trenches, raceways, cable trays and related equipment shall
be installed by the Buyer prior to equipment arrival.  Cables and pipes shall
be relayed to the various working areas by way of a _________ having a
____________, built in accordance with relevant electrical standards.  The
________ shall be equipped with cable ladders and/or cable ducts and be covered
(planks or galvanized roofing...).

The Seller shall provide detailed plans and recommendations regarding location,
size and number of trenches/pipes and cable trays that are required.

Cables and pipes for the ____________ shall be laid in different cable trays or
conduits from the cable trays or conduits housing the ___________.
_____________ cables are to be separately routed.

The Seller recommends that the trench be provided with ___________________.

______________ are needed for power cables, control cables, cyclotron system
water cooling pipes, vacuum system water cooling pipes, compressed air pipes,
gas pipes and ________________.

It is the Buyer's responsibility to ensure that the cable routing system meets
local electrical codes and requirements.





Theragenics/IBA Contract - Cyclotron #6 - _____________ - p.8
<PAGE>   36

3.       SERVICES

All services, as described in Appendix "Building Requirements", shall be
installed and made ready to be put into operation, before installation
commences.


4.       SECONDARY WATER COOLING CONNECTIONS

All piping from the Buyer's water cooling system must be installed.  Piping,
routed to locations suggested by the Seller, should have _______________ prior
to equipment installation.  A water make-up line should be provided.


5.       DUST

All floors, ceilings and walls including the inside of the trenches and other
openings shall be given a surface that minimizes dust generation.  It is
recommended that all surfaces be painted in a light color to improve visibility
and to promote safety.  All painting, sanding, placement of doors and windows
or similar will be completed.


6.       LIGHTING AND ELECTRICAL EQUIPMENT POWER

Suitable and sufficient lighting shall be provided in all work areas.  Standard
recommendations are as follows:

                -Vault
                -Power supply room
                -Control room

Emergency lighting should be available in all relevant areas.

Single phase outlets shall be located at intervals of 3 meters or less in each
room where Seller's equipment will be installed.


7.       COMPRESSED AIR OUTLETS

Exact location for the compressed air outlet will be specified for the
particular application by the Seller to the Buyer in due time.





Theragenics/IBA Contract - Cyclotron #6 - _____________ - p.9
<PAGE>   37

8.       POWER SUPPLY AND CONTROL ROOM FLOORING

This room requires a raised or "computer type" flooring.


9.       VENTILATION

The control and power supply rooms will be air-conditioned to ensure optimal
operation of the electronic equipment.  The other areas will be ventilated and
heated when necessary.  Ventilation conditions and other conditions, shall be
organized according to the current regulations in the Buyer's country.  The
relative humidity level will not exceed ____ in all relevant areas.  The
passageways of ventilation ducts in the walls shall comply with the
________________.


10.      HEATING

A temperature at ________ will be maintained in all relevant areas during the
installation and testing of the equipment.


11.      RADIATION PROTECTION

While the Seller can offer building design suggestions, the entire
responsibilities for meeting all local codes and regulations regarding
radiation protection remain with the Buyer.  The building and all work areas
will comply with all relevant safety standards concerning radiation protection
during all phases of construction, installation, testing and operation.  The
Buyer will be responsible for installation plans of a radiation protection
system in accordance with local codes and regulations.


12.      INFRASTRUCTURE & SERVICES

The Seller requires sufficient office space, tool storage, locker, furniture
and shower facilities for its personnel during the period of installation and
testing.  Construction site access must also meet the approval of the Seller's
engineer.

The Buyer must, at his own expense arrange for the destruction, pick-up and/or
clearing away of all waste, including Seller's Supplies packaging except
radioactive waste which will be handled as follows.  The Buyer agrees to
provide an uncontaminated area directly in front of the cyclotron vault that
can be used for unpacking components of the Supplies during assembly with the
understanding that all packing materials and other waste must be removed from
this area before the start of beam tests at which time the area in front of the
vault will be incorporated into the contaminated Hot Maintenance Area.  The
Buyer will also provide appropriate disposable protective clothing and gear for
Seller's personnel during installation and testing and will at its own expense
dispose of all such protective clothing and gear.  The Buyer will also at its
own expense dispose of one 55 gallon drum of solid radioactive waste produced
by Seller's personnel during installation.  For any additional





Theragenics/IBA Contract - Cyclotron #6 - _____________ - p.10
<PAGE>   38

radioactive waste produced by Seller's personnel during the installation
process, the Buyer and Seller agree to equally share the cost of disposal up to
a maximum of ____________ paid by the Seller.

Besides the maintenance of the building site, providing security and fire
protection is also the Buyer's responsibility.


13.      COMMUNICATION AND SURVEILLANCE EQUIPMENT

An intercom system shall interlink the ______________.  It would be useful to
be able to communicate from the ____________.  It is suggested that a
________________ be used in the ___________ for personnel safety.


14.      INSERTION OF THE SUPPLIES

a)       An appropriate opening through the wall shall be made in the cyclotron
         vault to allow for passage of the cyclotron.  This opening shall be
         closed by the Buyer as soon as the cyclotron will have been rigged
         into the cyclotron vault as closing of the opening is necessary for
         progressing with the installation of the Supplies.  The inside surface
         of the vault closing will be finished within 5 days after the
         cyclotron has been place in its final location.

b)       A maneuvering area for a heavy trailer ______________ unloading and a
         covered area ____________ for the assembly of the major components of
         the Supplies must be provided for in front of the opening outside the
         vault with adequate access to nearby roads.

         The covered area shall be such as to be able to serve as storage area
         for the rest of the Supplies while the cyclotron is rigged and the
         opening in the vault is closed.  Its floor shall support the use of a
         three-ton forklift truck.

         The ground of the cyclotron vault and of the unloading area shall be
         surfaced with reinforced concrete capable of withstanding the
         necessary maneuvering of the cyclotron into position.

c)       All doors, corridors and other passageways leading to the control room
         or any other room where Seller's equipment will be installed shall be
         cleared so as to allow transportation of the Seller's equipment by
         mean of a three-ton forklift truck or a similar transportation vehicle
         from the unloading area to the place of final installation of the said
         equipment.

d)       For unloading and installation of additional equipment delivered to
         the Site during the installation period, the Buyer shall prepare
         building access and surroundings in order to allow access and
         unloading of 10-ton trucks (unloading platform if possible).  It must
         be possible to perform the trucks unloading and the introduction of
         the additional equipment in the building with a hand-lift.  The
         possibility to use the Buyer's fork-lift if needed would be
         appreciated.





Theragenics/IBA Contract - Cyclotron #6 - _____________ - p.11
<PAGE>   39

15.      CONSULTING SERVICES

Typically, prior to the issuance of a purchase order or execution of some other
form of purchase agreement, the Seller will have prepared a preliminary layout
of the Buyer's facility and furnished various data regarding required building
services.  After the purchase agreement has become effective, the Seller,
without additional charge, will make a final layout and prepare such other
plans and memoranda necessary to transmit data to the Buyer's architects and
engineers.  Similarly, the Seller, without additional charge, will review the
initial set of architectural and engineering drawings and minor revisions
thereof.  However, the time devoted to preparation by the Seller's personnel of
additional layouts or drawings and/or reviews of revised sets of architectural
and engineering drawings will be invoiced at the Seller's regular rates.  No
additional charge will be made for telephone consultations.  Travel and related
expenses incurred as a result of attendance by the Seller personnel required at
meetings outside of Belgium with the Buyer's architects, engineers, consultants
and/or representatives will be reimbursed by the Buyer.  With respect to the
foregoing, the responsibility for determining whether conflict exists between
local building codes and/or other laws or government regulations and the
content of drawings, data sheets, memoranda or other forms of communication
submitted by the Seller is solely the responsibility of the Buyer, his
architects, engineers and/or consultants.





Theragenics/IBA Contract - Cyclotron #6 - _____________ - p.12
<PAGE>   40

                                    APPENDIX

                              INCLUDED SPARE PARTS

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission





The following spare parts are included in the total purchase price of the
Supplies:



         -other miscellaneous spares for a value of __________, to be specified
          by the Buyer.





Theragenics/IBA Contract - Cyclotron #6 - _____________ - p.13
<PAGE>   41

                                    APPENDIX

                              ACCEPTANCE CRITERIA

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission


The Buyer is prepared to purchase the Supplies because the Seller has
represented that they will possess certain characteristics which make them
useful and of value to the Buyer.  The following Acceptance Criteria embody the
Buyer's understanding of these characteristics and therefore the Buyer's
willingness to purchase the Supplies is predicated upon the Supplies actually
having these characteristics.  The Acceptance Tests which follow are intended
to establish whether or not the Supplies are likely to possess these
characteristics and consequently determine if the Buyer should pay the full
agreed price for the Supplies.

Acceptance of the Supplies by the Buyer requires that they meet the following
minimum criteria as demonstrated by the Acceptance Tests:

1.       The Supplies must conform with the parameters set out in the Appendix.
"Cyclotron Parameters" and the Appendix "______________ Target Parameters."

2.       All of the items making up the Supplies must function together in a
way which provides reliable, continuous operation with _________________.  This
performance must be sustainable over a routine production schedule defined as
_______________.  Furthermore, the ___________________.

3.       The target system must be designed so that it efficiently utilizes the
protons impinging the target.  The rate of Pd-103 production in the rhodium
target must meet or exceed __________.  If the rate of production is determined
during the Acceptance Test to be _____________ of the above production rate,
the Seller may correct the deficiency by _____________, i.e., the guaranteed
intensity as referred to in Appendix "Cyclotron Parameters".

4.       Void.

5.       Routine operation as defined in Item 2 above must not lead to
structural damage to internal components of the cyclotron or the target
assembly due to interactions between the beam and such components.

6.       The radiation level within the cyclotron must not increase as a result
of proton and neutron activation and target evaporation to a level which makes
it unsafe to maintain and service the internal components.

7.       The target handling device shall reliably remove the ______________
target from the cyclotron and place it into a shielded container for manual
transfer to the target processing laboratory.  The operation of the target
handling device shall be _______________________.  A written procedure,
providing adequate radiation protection, shall be prepared in case it is
necessary to _________________.  The rhodium surface and all other surfaces of
the target handling system





Theragenics/IBA Contract - Cyclotron #6 - _____________ - p.14
<PAGE>   42

shall be shielded so an operator can safely enter the cyclotron vault to
transfer the shielded target out for processing.





Theragenics/IBA Contract - Cyclotron #6 - _____________ - p.15
<PAGE>   43

                                    APPENDIX

                                ACCEPTANCE TESTS

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission

The following tests were developed based on experience gained through the
operation of the first three IBA __________ cyclotrons.  They provide a
reasonable test of the functionality of the Supplies and when combined with the
Technical Assistance provided by the Seller as called for in Section 25 of the
Contract, should provide the Buyer a fully functional cyclotron properly
integrated into Buyer's production environment.

All radiation monitoring and measuring equipment used in these tests will be
provided by the Buyer.  All targets and the _________ are the Buyer's
responsibility and at its own expense.

Test 1.  The Supplies shall be demonstrated to comply with the specifications
set out in the Appendix "Cyclotron Parameters" and the Appendix "___________
Target Parameters" by the means specified in the Appendices.

Test 2.  When the Supplies have been declared fully operational by the Seller,
the target handling device shall be cycled through a complete transfer from
demounting a fully installed target as it would be installed for a production
run through placing the target into a shielded container and the container
closed.  This portion of this test shall be deemed passed when ___________ have
been completed.  The target shall be transferred from the cyclotron to the
shielded container 5 times following the routine procedure for
__________________.

Test 3.  When the Supplies are fully installed and Tests 1 and 2 have been
successfully completed, the Supplies must operate for ____________________.
The target must then be removed and inspected in the hot cell to determine that
the beam strike was on target, _________________.  When the Buyer concurs in
writing, such concurrence not to be unreasonably withheld, that the Supplies
performed according to the specifications, the Supplies will be deemed to have
been accepted and Seller become eligible for the Acceptance Payment.





Theragenics/IBA Contract - Cyclotron #6 - _____________ - p.16
<PAGE>   44

                                   APPENDIX

                  ACCELERATED DELIVERY AND ACCEPTANCE OPTION

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission


The Buyer has the option to request to the Seller, at any time during this
Agreement, to work on an accelerated schedule basis in order to have the
Supplies accepted at an earlier date than the scheduled acceptance date of
__________________.  Official request must be made in writing and addressed to
Yves Jongen, President of IBA.

In the case the Buyer exercises this option, the Buyer will pay the Seller an
additional sum of ___________ for each complete day between the actual date of
early acceptance and ______________, including the day of
_______________________.





Theragenics/IBA Contract - Cyclotron #6 - _____________ - p.17

<PAGE>   1

                                EXHIBIT 10.23(c)

                               Purchase Agreement
                                     between
                             Theragenics Corporation
                                       and
                           Ion Beam Applications s.a.
                                      dated
                                December 27, 1996


Confidentialportions of this  document have been blanked out and have been filed
            separately with the Securities and Exchange Commission.

<PAGE>   2










                               Purchase Agreement

                                     between

                          Theragenics Corporation Inc.

                                       and

                           Ion Beam Applications S.A.

                                       for

                       _______________ Cyclotron Number 7

                                       and

                            Related Target Equipment








<PAGE>   3


                                Table of Contents

Purchase Agreement

1.  Interpretation............................................................3
2.  Subject Matter of Sale....................................................4
3.  Purchase Price of the Supplies............................................5
4.  Title and Risk of Loss....................................................7
5.  Delivery..................................................................7
6.  Installation of Supplies..................................................7
7.  Preparatory Work..........................................................9
8.  Acceptance...............................................................11
9.  Transportation and Insurance.............................................13
10. Export Documents, Duties and Foreign Taxes...............................14
11. Customs Duties, Buyer's Country Taxes and Import Permits.................14
12. Warranty As To Title.....................................................14
13. Design and Performance Warranty..........................................15
14. Material and Workmanship Warranty........................................15
15. Logging of Operations....................................................16
16. Training.................................................................16
17. Disclaimer of Liability for Personal Injury..............................16
18. Liability for Consequential Damages......................................17
19. Infringement of Proprietary Rights.......................................17
20. Seller's and Buyer's Proprietary Information.............................19
21. Destruction of Supplies..................................................20
22. Excusable Delay..........................................................20
23. Termination for Insolvency...............................................21
24. Spare Parts..............................................................21
25. Technical Assistance by the Seller.......................................21
26. Entire Agreement.........................................................22
27. Authorization............................................................22
28. Effective Date...........................................................22
29. Disputes.................................................................23
30. Governing Laws...........................................................23
31. Notices..................................................................23
32. Project Coordinator......................................................24
33. Assignment...............................................................25
34. Headings.................................................................25
35. Severability.............................................................25
36. Non-Waiver...............................................................25

Appendices

Cyclotron Parameters
__________ Target Parameters
Building Requirements
Building Completion Specifications
Included Spare Parts
Acceptance Criteria
Acceptance Tests
Accelerated Delivery and Acceptance Option



<PAGE>   4


                               Purchase Agreement


AGREEMENT  made as of this 27th day of  December  1996 by and  between  ION BEAM
APPLICATIONS,  S.A., a corporation  organized under the laws of Belgium,  having
its principal  office at Chemin du Cyclotron 3, 1348  Louvain-la-Neuve,  Belgium
(hereinafter  called the "Seller",  which expression includes its successors and
permitted assignees) and THERAGENICS CORPORATION, having its principal office at
5325 Oakbrook  Parkway,  Norcross,  Georgia 30093, USA  (hereinafter  called the
"Buyer", which expression includes its successors and permitted assignees).

WITNESSETH :

WHEREAS, the Seller wishes to sell to the Buyer and the Buyer wishes to buy from
the  Seller,  the  Seller's  model  _____________  cyclotron,   related targetry
equipment and spare parts therefore, all as more particularly described herein :
and

WHEREAS,  the Buyer wishes the Seller to assemble,  install,  start up, test and
make operational the ______________  cyclotron to be purchased including related
equipment and the Seller is willing to undertake this task : and

NOW, THEREFORE,  in consideration of the mutual covenants herein contained,  the
parties hereto agree as follows :


1. Interpretation

In this Agreement, unless the contrary intention appears :

"Acceptance" means the process whereby the Seller demonstrates to the Buyer that
the Supplies provided meet the requirements of the Agreement. This process shall
consist of a series of tests,  the  "Acceptance  Tests" as  defined in  Appendix
"Acceptance   Tests",   which  demonstrate  the  Supplies  meet  the  guaranteed
specifications, the Acceptance Criteria.


<PAGE>   5


"Acceptance  Criteria"  mean the  guaranteed  specifications  of the Supplies as
defined in Appendix "Acceptance Criteria".

"Acceptance  Date"  means the date on which the Buyer  agrees  that based on the
Acceptance  Tests, the Supplies have met the Acceptance  Criteria . The Supplies
shall be deemed  accepted  when the Buyer and Seller  agree in writing  that the
Acceptance Tests have been successfully completed.

"Acceptance Tests" are the tests listed in Appendix "Acceptance Tests".

"Agreement" means this document and includes its Appendices.

"Buyer's Country" means the country where the Site is located.

"Day" means calendar day;  "Week" means  calendar  week;  "Month" means calendar
month.

When the last day of any period  prescribed  for the execution of any assignment
falls on a day which is not a working day in Belgium or in the Buyer's  Country,
the  assignment  may be  performed  on  the  first  working  day  following  the
aforementioned day.

"Effective Date" has the meaning set forth in Section entitled "Effective Date".

"Excusable  Delay"  has the  meaning  set forth in Section  entitled  "Excusable
Delay".

"Site" means the Buyer's facility in Buford, Georgia, USA.

"Supplies" means all equipment,  hardware, software (including installation) and
the  associated  documentation,  support  equipment  and services to be provided
under the Agreement, as detailed in Appendix "Cyclotron Parameters" and Appendix
"_______________________ Target Parameters".



<PAGE>   6



2. Subject Matter of Sale

Subject to the terms and conditions of this Agreement :

a) The Seller  shall sell and deliver to the Buyer and the Buyer shall  purchase
from the Seller (i) a __________________ cyclotron, the technical specifications
of  which  are more  fully  described  in the  Appendix  "Cyclotron  Parameters"
Appendix hereto; (ii) _________ target system,  the technical  specifications of
which are more fully  described  in the Appendix  "__________ Target Parameters"
hereto;  and (iii) a set of spare parts listed in the Appendix  "Included  Spare
Parts" hereto;

b) The Seller shall also assemble, install, start up, test, make operational and
perform the Acceptance Tests on the Supplies.

c) The  Seller  shall  send one of his  specialists  to assist in  bringing  the
cyclotron to full  operational  capacity after Acceptance of the Supplies by the
Buyer, as described in Section 25.

d) The Buyer and  Seller  agree  that an option  for  accelerated  delivery  and
acceptance as described in Appendix "Accelerated Delivery and Acceptance Option"
may be  exercised  by the Buyer.  In case that option is exercised by the Buyer,
the covenants of the "Accelerated Delivery and Acceptance Option" Appendix shall
be applicable to both parties.


3. Purchase Price of the Supplies

a) The  aggregate  purchase  price  (hereinafter  the "Price") of the  Supplies,
including  packaging,  insurance and transportation of the Supplies to the Site,
the  assembly,  testing and start up of the  Supplies  described  in the Section
entitled  "Subject  Matter  of  Sale"  above,   shall  be   ____________________
________________________________.  This price shall also  include the  technical
assistance  by the Seller as  described in Section 25, the Spare Parts as listed
in  Appendix  "Included  Spare  Parts"  and  the  Seller's  contribution  to the
applicable USA customs duty as stated in Section 11 of this Agreement.

b) As a down payment  equivalent to  ____________  has been made by the Buyer to
the Seller on November 6, 1996, the balance of the Price set forth in subsection
a) shall be payable as follows:


<PAGE>   7


     i)  ____________________________________________________________________ to
be paid to the Seller upon execution of this Agreement;

     ii) ____________________________________________________________ to be paid
to the  Seller  on  March 1,  1997.  This  payment  shall  be  guaranteed  by an
irrevocable  standby  letter of credit to be issued in favor of and  approved by
the Seller within one month from the Effective Date.

     iii)_____________________________________________________________   to   be
paid to the Seller on January 1, 1998.  This payment  shall be  guaranteed by an
irrevocable  standby  letter of credit to be issued in favor of and  approved by
the Seller by March 1, 1997.

     iv) _________________________________________________________ to be paid to
the Seller  within 15 days from shipment of the Supplies as evidenced by receipt
of the  shipping  documents  and no later than June 1, 1998 if the  shipment  is
delayed by Buyer's  fault.  This payment shall be  guaranteed by an  irrevocable
standby  Letter of Credit to be issued in favor of and approved by the Seller by
the date of shipping of the  Supplies,  to be notified by Seller to the Buyer at
least 30 days in advance.

     v)  _________________________________________________________ to be paid to
the Seller within 15 days of the Acceptance of the Supplies.  This payment shall
be guaranteed by an  irrevocable  stand-by  Letter of Credit,  which can only be
exercised  during  the  year  following  the  delivery  of  the  Supplies,   and
conditioned  only  upon  successful  completion  of  the  Acceptance  Tests  and
providing  further  that,  in the event the Seller is  prevented  by the Buyer's
fault,  by a delay  on the  part of the  Buyer,  or by a  regulatory  body  with
jurisdiction over the Buyer from completing the Acceptance Tests for a period of
sixty (60) days or more,  payment  thereunder  to the Seller  shall be made upon
demand of the  Seller.  This  Letter  of Credit  shall be issued in favor of and
approved by the Seller,  such approval not to be unreasonably  withheld,  by the
date of  shipping  of the  Supplies,  to be notified by Seller to Buyer at least
thirty days in advance.

c) All  payments  by the Buyer to the Seller  under this  Agreement  shall be in
Belgian Francs and,  except those  specified in paragraph 3. b) above,  shall be
made by wire transfer within thirty (30) days from the date of invoice.


<PAGE>   8


d) All  payments  by the Buyer to the Seller will be deemed to have been made by
the Buyer on the date on which  the  Seller  has been  credited  for the  proper
amounts.  Any payment due to the Seller  which is not paid on the due date shall
accrue  interest for each started  month of delay at an annual rate of one point
above  the rate of the  "Avance  en Compte  Courant  Hors  Plafond  de la Banque
Nationale de Belgique" as published in "l'Echo" on the first day of such month.


4. Title and Risk of Loss

Except as indicated  below in this  paragraph,  title to the  Supplies  shall be
transferred  from the Seller to the Buyer when and to the  extent  payments  are
received by the Seller.  The Buyer  represents  and  warrants  that it shall not
cause or permit to be caused  any lien or  encumbrance  of any kind to be placed
upon the  Supplies  to an  extent  greater  than its share of  ownership  in the
Supplies.  It is  understood  that if the  Seller is unable to  demonstrate  the
Supplies  meet  the  Acceptance  Criteria  within  one year of  delivery  of the
Supplies to the Buyer's Site, clear title to the Supplies transfers to the Buyer
without  obligation to pay to the Seller the final payment  specified in Section
3.b.v unless the Seller has been prevented from conducting the Acceptance  Tests
as described in Section 8, last paragraph.

Risk of loss of any part of the Supplies shall pass from the Seller to the Buyer
upon delivery of such parts to the Site.


5. Delivery

The  Seller  shall  deliver  the  Supplies  to the Buyer at the Site and set the
Supplies in their final location.


6. Installation of Supplies

a) The assembly and  installation of the Supplies at the Site and the Acceptance
Tests are planned to be completed by _____________________________________ after
completion  of  Site  preparation  by  the  Buyer  at  the  Seller's  reasonable
satisfaction  as  evidenced  by  an  acceptance  document  of  the  Site  ("Site
Acceptance  Document")  signed by the  Seller,  whichever  is later.  The Seller
undertakes to make its best efforts to complete the installation and testing

<PAGE>   9


within this period.  During the  installation  period the Buyer shall permit the
Seller's  employees,  subcontractors  or  agents  unlimited  access  to the Site
provided said  individuals  comply with policies and procedures  established for
the Buyer's employees regarding such matters as health and safety issues.

b)  With  reasonable  notice  to  the  Seller,  the  Buyer  and  its  authorized
representatives  shall,  during reasonable working hours, be free to inspect the
quality and  conditions of the Supplies at the Seller's site during  fabrication
and at any time upon arrival of the same at the Site and during the installation
period.  The Seller will notify in writing to the Buyer when the major materials
are available for construction of the cyclotron.

c) The Buyer at its sole expense shall  provide the Seller with closed  premises
on or reasonably  near the Site in which the Seller may store employee  clothing
and tools and equipment required for the installation.  However,  the Buyer does
not assume any risk with respect to the loss or theft of any such items while on
the Buyer's premises.

d) The Buyer shall,  at its sole expense,  provide the Seller with the following
utilities  required for installation of the Supplies and Acceptance Tests on the
Supplies:  electricity,  water,  compressed  air,  dry  nitrogen for venting the
vacuum  chamber,  hydrogen  gas for the ion  source,  as  described  in Appendix
"Building Requirements".  Access to telephone and fax equipment connected to the
international network is required and the Seller will pay the charges associated
with the use of this line.  The Buyer shall provide all the necessary  radiation
measuring  equipment  required for the operation and the Acceptance Tests on the
Supplies.

e) Within  fifteen  (15) days from the date of delivery of the  cyclotron at the
Site, the Buyer shall permit the Seller to produce beams at full energy and full
intensity in the cyclotron vault.

f) The Price  reflects labor  provided by the Seller.  Any  additional  labor or
costs  required by local labor codes,  etc.  will be the  responsibility  of the
Buyer.

g) The Supplies are manufactured  according to Belgian technical  standards.  If
the Buyer requires compliance of the Supplies with specific technical standards,
these  technical  standards  must be notified by the Buyer to the Seller  within

<PAGE>   10


seven weeks of the Effective  Date. All  additional  costs related to making the
Supplies  conform to those norms or specific  standards  shall be charged to the
Buyer.


7. Preparatory Work

a) The Buyer shall have the sole  responsibility,  at its sole expense,  for the
work required to prepare the Site for installation of the Supplies. The building
to house the Supplies and the systems  contained  therein  shall comply with the
specifications   detailed  in  Appendix  "Building  Requirements"  and  Appendix
"Building Completion Specifications". As soon as possible after completion, and,
at the  latest,  on_____________,  the  Seller  shall  prepare  for the  Buyer a
proposed  layout and prepare such other plans and  memoranda as are necessary to
transmit data to the Buyer's  architects and engineers.  By  __________________,
the Buyer shall furnish to the Seller  drawings and plans for the Site including
the  building  and  systems  detailed in Appendix  "Building  Requirements"  and
Appendix "Building Completion Specifications" in sufficient detail to enable the
Seller to judge whether the Site will be satisfactory  for the Supplies and will
meet  the  specifications  detailed  in  Appendix  "Building  Requirements"  and
Appendix  "Building  Completion  Specifications".  Within  four (4) weeks of the
receipt of this initial set of architectural and engineering drawings and plans,
the  Seller  shall  provide  the  Buyer  with  comments   thereon  and  detailed
information  as to such  modifications  therein  as the Seller  deems  necessary
including such drawings and technical  documents as may be required by the Buyer
to complete the  installation  of the cables,  cooling water and  compressed air
systems.  However,  the time  devoted to  preparation  by personnel of Seller of
additional  layouts or drawings and/or reviews of revised sets of  architectural
and  engineering  drawings  will be  invoiced  at  Seller's  regular  rates.  No
additional charge will be made for telephone  consultations.  Travel and related
expenses  incurred as a result of attendance by personnel of the Seller required
at  meeting  outside  of  Belgium  with  the  Buyer's   architects,   engineers,
consultants and/or representatives will be reimbursed by the Buyer. With respect
to the foregoing,  the  responsibility  for determining  whether conflict exists
between local building codes and/or other laws or government regulations and the
content of  drawings,  data sheets,  memoranda  or other forms of  communication
submitted  by  the  Seller  is  solely  the  responsibility  of the  Buyer,  his
architects,  engineers and/or consultants. The definitive drawings and plans for
the Site,  made in accordance  with the Seller's  comments and  recommendations,
will then be  furnished  by the  Buyer to the  Seller  by  ________________.  In
addition,   unless   otherwise   specified,   the  Buyer  shall  have  the  sole
responsibility  for the  design and  construction  of the  radiation  monitoring
systems, of the shielding required to

<PAGE>   11


prevent  radiation leakage and of the systems required to handle the disposal of
radioactive waste.

Any delay on the part of the Seller in meeting its  obligations  related to this
Section  by more  than ten (10)  days  will add a number  of days to the  period
provided for the  performance  by the Buyer equal to the number of days of delay
by the Seller.

b) Before  commencing  installation,  the Seller shall  inspect the Site and the
Buyer shall  submit to the Seller the Site  Acceptance  Document to be signed by
the Seller confirming that the preparatory work meets all the criteria set forth
in the Section entitled  "Installation of Supplies",  paragraph c) and d) and in
Appendix   "Building    Requirements"   and   Appendix   "Building    Completion
Specifications".   This   acceptance   document  only   indicates  the  Seller's
willingness to begin the  installation of the Supplies in the Buyer's  building.
It  does  not  discharge  the  Buyer  and  his  subcontractors  of any of  their
responsibilities   regarding  the  building.   The  Buyer  shall   complete  the
preparatory work at the Site by ____________. If the preparatory work as regards
the cyclotron vault is substantially completed before that date, the Buyer shall
accept  delivery  and/or  installation of the Supplies as soon as possible under
the applicable  laws and  regulations.  In the event that such work has not been
completed  before that date,  or if for any other  reason the Buyer is unable to
accept delivery of the Supplies or commencement of the  installation  thereof by
that date,  the Buyer shall  immediately  give the Seller written notice of this
fact and the anticipated new date for completion of the preparatory work. In any
case,  the Seller may ship the  Supplies  to the Buyer at any time and the Buyer
shall store them in one of its warehouses until the date the preparatory work is
completed.

c) One week before  commencing  installation and setting of the cyclotron in its
vault,  the Buyer shall allow the Seller  full  access to the  cyclotron  vault,
power supplies and control room and all other rooms related to the  installation
of the Supplies to allow for the measurement of line-up marks to be performed.

d) The Buyer's completion,  to the reasonable satisfaction of the Seller, of its
undertakings  in this  section  and  elsewhere  in this  Agreement  relating  to
preparation of the Site and the continuous  furnishing of necessary services and
permits set forth in the Section entitled "Installation of Supplies",  paragraph
c), d) and e) and in Section entitled "Custom Duties,  Buyer's Country Taxes and

<PAGE>   12


Import   Permits"   and  the   requirements   detailed  in  Appendix   "Building
Requirements"  and  Appendix  "Building  Completion  Specifications"  shall be a
condition precedent to the Seller's commitment to perform within the time period
specified under the Section entitled  "Installation of Supplies" hereof, and any
delay or  interruption  by the  Buyer in  meeting  its  obligations  under  this
Agreement in a timely  fashion  shall extend the Seller's  time to perform under
this  Agreement  including  but not  limited to Seller's  time to  exercise  and
perform under the option for  accelerated  delivery and  acceptance  outlined in
Appendix  "Accelerated Delivery and Acceptance Option", by a period equal to the
period of the Buyer's delay or interruption plus, if shipment and/or delivery is
delayed by Buyer's  fault or at Buyer's  request,  an  additional  period not to
exceed four weeks to reschedule  shipment and/or delivery of the Supplies and/or
personnel as may be required.

In the event of any such delay or  interruption,  the Buyer will  reimburse  the
Seller for any  reasonable  costs  incurred as a direct  result of such delay or
interruption.  Additionally,  if such  postponement or  interruption  delays the
Buyer's  obligation  to make any of the payments  set forth in Section  entitled
"Purchase Price of the Supplies", paragraph b) hereof, interest will be computed
for each  started  month of delay at an annual  rate one point above the rate of
the "Avance en Compte  Courant Hors Plafond de la Banque  Nationale de Belgique"
as published in "l'Echo" on the first day of such month.

If all the  conditions  necessary  for the  Seller  to sign the Site  Acceptance
Document  referred  to in the  above  Section  have  not been met at the time of
delivery of the Supplies,  the Seller will  nonetheless make its best efforts to
start the  installation  of the Supplies as soon as reasonably  possible and the
Buyer will give the Seller any reasonable  support to allow the Seller to do so.
However,  beginning of installation of the Supplies in the building,  under such
conditions,  will under no circumstances be considered as implicit acceptance of
the Site by the Seller.


8. Acceptance

On the date set by the Seller for the conduct of the  Acceptance  Tests,  and in
the presence of the Buyer's  representatives,  the Seller shall begin to conduct
the agreed-upon Acceptance Tests.

Not more than twenty four (24) hours following the completion of such tests, the
Buyer shall either accept the Supplies as conforming to the requirements of the

<PAGE>   13


Agreement  by  issuing  an  acceptance  certificate   "Acceptance   Certificate"
acknowledging  that  decision,  or advise the Seller in writing of the extent to
which the Supplies do not meet the requirements of the Agreement.

The Buyer shall not withhold the issue of the Acceptance  Certificate on account
of minor omissions or defects in the Supplies which do not substantially  affect
their use but may designate in the Acceptance  Certificate such minors omissions
or defects. The Seller shall promptly make good these omissions or defects.

If the Buyer does not give notice within the period  stipulated above, or begins
using the  Supplies for its own use,  such tests shall be deemed  satisfactorily
completed,  the Acceptance  Certificate  shall be deemed issued on that date and
the related  acceptance  payment shall be paid to the Seller within 15 days from
that date.

If  the  Buyer   gives  the  Seller   notice  that  such  tests  have  not  been
satisfactorily  completed,  the  Seller  shall  make  such  adjustments  as  are
necessary  and  repeat  the   Acceptance   Tests  until  the  Buyer  deems  them
satisfactory pursuant to the terms set out above.

Until _____________,  the Seller shall have unimpeded  access to the Supplies to
complete the Acceptance Tests. If the Seller is unable to successfully  complete
the Acceptance Tests by _______________, the Buyer shall be free to begin use of
the  Supplies  forty five (45) days later.  Should the  Supplies be put into use
under this  condition,  it is  understood  the Buyer and Seller will make a good
faith effort to facilitate  the completion of the  Acceptance  Tests,  but it is
further  understood that the Buyer's production of Pd-103 with the machine takes
precedence.  The Buyer agrees to allow the Seller three (3) prescheduled days of
unimpeded    access   to   the    Supplies   per   month   during   the   period
between________________,   until  the  period  for  acceptance  has  expired  as
specified in Section 4 "Title and Risk of Loss".

If a dispute  arises  between  the Buyer and the Seller  concerning  whether the
Acceptance Tests have been successfully  completed or concerning the issuance of
the  Acceptance  Certificate,  the Buyer and the Seller  will  jointly  agree to
obtain the services of the American Arbitration Association ("AAA") to arbitrate
the dispute,  as described in Section 29  hereafter.  Both parties will abide by
AAA's recommendations.


<PAGE>   14


If the Seller is prevented  either by the Buyer or by any  regulatory  body that
has juridiction over the Buyer from conducting the Acceptance Tests for a period
of sixty (60) days,  the Buyer  shall be deemed to have  accepted  the  Supplies
sixty  (60) days  after the  Seller  was first  prevented  from  conducting  the
Acceptance  Tests. If the Seller is prevented by force majeure or events similar
to  those  enumerated  under  Section  "Excusable  Delay"  from  conducting  the
Acceptance  Tests, the Buyer shall pay 50% of the Acceptance  payment as defined
in Section 3 b) v). In either  case the Seller  shall  complete  the  Acceptance
Tests within the period remaining at the time the impediment began.


9. Transportation and Insurance

Seller shall at its own expense :

i) Obtain appropriate  property and liability  insurance covering loss or damage
to the Supplies  and  injuries to  individuals  during the  construction  of the
Supplies and during the  transportation  of the Supplies from the Seller's plant
to the Site.

ii) Pay all freight and other transportation charges associated with delivery of
the Supplies to the Site, and have a representative  present during the transfer
of the Supplies from the port of entry to the Site.

iii) Maintain worker's compensation insurance during the assembly,  installation
and testing of the  Supplies,  as  required  by  applicable  law,  covering  its
employees  and,  upon request  from Buyer,  provide a  certificate  of insurance
evidencing such coverage.

Buyer shall at its own expense:

i) Obtain appropriate  property and liability  insurance covering loss or damage
to the Supplies  between  delivery of the Supplies at the Site and the time when
the  Seller  has  been  paid in full  for the  amounts  under  Section  entitled
"Purchase Price of the Supplies". In such insurance policies, both the Buyer and
the Seller shall be named as insured parties.

ii) Arrange for the  destruction,  pick-up  and/or  clearing  away of all waste,
including the Supplies  packaging  except for the disposal of radioactive  waste
which is covered in section 12 of appendix "Building Completion Specifications".


<PAGE>   15


The Buyer and the Seller  shall each take out and  maintain at their own expense
during the period from receipt of the  Supplies at the Site through  Acceptance,
insurance to provide  coverage for both itself and the other party for an amount
of at least one million US dollars  (US$  1,000,000)  per  accident  against any
direct and indirect liability for bodily injury and death to individuals and all
direct or  indirect  costs,  losses  and  damages to the  property  of the other
arising  out of  each  other's  acts  or  omissions  in  unloading,  assembling,
installing and testing of the Supplies.


10. Export Documents, Duties and Foreign Taxes

The Seller will be  responsible  for obtaining all necessary  export  permits or
licences  relating  to the  Supplies  and the Buyer will  offer such  reasonable
assistance  in this regard as the Seller may  request.  The Seller shall pay any
and all export  duties and all other taxes  required  to be paid  outside of the
Buyer's Country in connection with the sale of the Supplies.


11. Customs Duties, Buyer's Country Taxes and Import Permits

The Buyer  shall pay all sales,  use,  gross  receipts,  excise and other  taxes
assessed  or levied by the  Buyer's  Country or any other  taxing  jurisdiction,
state or local,  within the Buyer's  Country,  against the Buyer  (including any
fines, penalties and interests thereof) as a result of or in connection with the
sale, use, delivery, storage or transfer of the Supplies.

The Seller agrees to equally share with the Buyer the cost of the import customs
duties levied by the customs authorities of the USA at the entry of the Supplies
into the USA, up to a maximum  cost for the Seller  equal to two percent (2%) of
the price of the Supplies.

The Buyer shall be responsible  for obtaining all necessary  permits or licences
with respect to the  importation of the Supplies in the Buyer's  Country and the
installation  and use of the Supplies at the Site, and the Seller will offer the
Buyer such reasonable assistance in this regard as the Buyer may request.



12.  Warranty As To Title

The Seller warrants good title to the Supplies.



<PAGE>   16



13. Design and Performance Warranty

The Seller hereby  warrants  that the Supplies  will perform in accordance  with
applicable  design  and  performance   specifications   set  forth  in  Appendix
"Cyclotron  Parameters"  and in  Appendix "_____ Target Parameters" for a period
of one (1) year after the Acceptance  Date. The Seller shall resolve any design
flaws appearing during the first year following the Acceptance of the Supplies.


14. Material and Workmanship Warranty

The  Seller  hereby  warrants  that the  Supplies  will be free from  defects in
material  and  workmanship  for a  period  of one  (1)  year  from  the  date of
acceptance of the Supplies by the Buyer or fifteen (15) months from the date the
Supplies are put in their final  location in the Buyer's vault if the Acceptance
Date is delayed at the Buyer's  request or through the Buyer's fault,  whichever
period is shorter: provided,  however, that this warranty shall not apply to ion
source stamped cathodes and chimneys,  puller electrodes,  air filters, targets,
oil for the vacuum  pumps,  demineralizing  column,  gas bottles (H2 for the ion
source, N2 for  venting,...),  and other  consumables;  that the Seller makes no
warranty with respect to failures notified after the warranty period or failures
during operation without logging or failures due to alteration, misapplications,
abuse, abnormal conditions of temperature,  dirt, corrosive matter,  maintenance
not  carried  out  according  to the  Seller's  instructions,  lack  of  trained
personnel for maintenance,  operation above rated capacities either  intentional
or otherwise,  or in an otherwise  improper  manner or physical damage caused by
persons  other than  employees or agents of the Seller;  that the Seller's  sole
liability  under valid  warranty  regarding  claims for defects in material  and
workmanship is limited, at the option of the Seller, to repair or replacement of
the defective parts; that with respect to components purchased by the Seller for
incorporation into the Supplies  essentially  without  modification,  the Seller
makes no  warranties  of its own but  assigns  to the  Buyer  the full  warranty
extended to the Seller as part of the original purchase of the component.

If, due to a fault of the Seller,  the Supplies  have not passed the  Acceptance
Tests by _____________, the Seller's warranty shall start and be in effect until
__________________.


<PAGE>   17


The Seller  shall  bear the cost and risk of loss  during  transport  of (i) any
defective  part or components  being  returned to the Seller's  factory with the
Seller's  agreement and (ii) any repaired or replacement  item being returned to
the Buyer.  Products or parts returned without the agreement of the Seller shall
be at the Buyer's  sole risk and expense.  The Seller  shall bear any  personnel
costs incurred in connection  with the  fulfillment of the Seller's  obligations
under this warranty.

The foregoing warranties are exclusive and are given and accepted in lieu of all
other warranties of quality written or oral,  express or implied,  and all other
warranties are hereby disclaimed.


15. Logging of Operations

The Buyer shall keep a logbook of operation  for the  Supplies.  In this logbook
shall be  documented  all  sessions of  operation of the Supplies as well as any
problems  encountered  during  operation of the Supplies.  If the Buyer requests
assistance  from the Seller in  resolving a problem  with the  Supplies  and the
information in the log is relevant to this resolution, the Buyer may at its sole
discretion  make the log available to the Seller . If the Buyer presents a claim
against the  warranty  provided  by the  Seller,  a copy of the log must be made
available to the Seller.  It is  understood  by the Seller that the  information
contained in the Log may be of a proprietary  nature and is therefore covered by
the confidentiality agreement between the parties.


16. Training

The Seller agrees to provide up to two days of training in _________  operation,
preventative  maintenance and repair to the Buyers' personnel at the Site during
or immediately after the installation  period, with the exact dates and times to
be mutually  agreed by the Buyer and Seller.  The cost of such training shall be
the responsibility of the Seller.


17. Disclaimer of Liability for Personal Injury

The Seller and the Buyer hereby acknowledge that the products,  as offered,  are
highly sophisticated devices which should be operated only by trained personnel;
that it is the Buyer's sole obligation to retain and train such personnel or

<PAGE>   18


have it trained,  possibly by the Seller;  that, where  necessary,  the Supplies
contain  interlocking  devices  designed to prevent their  operation in a manner
which  would  cause  injury  to such  personnel,  but as in the  case  with  all
equipment  utilizing  high  voltages,  such  personnel  should  assume  that the
interlocking  devices are  inoperative and should take  appropriate  measures to
ensure that the voltage  has been turned off prior to begin  working  where high
voltage is present during the start up and/or operation of the Supplies; that it
is inherent in the  operation of the  Supplies  that  portions  thereof may emit
dangerous  ionizing  radiation  and may become  activated  during  their  normal
operation;  that it is the Buyer's sole  obligation  to  determine  the level of
radioactivity,  to ensure that a system exists for determining and recording the
levels of  radioactivity  and to ensure that no personnel  or other  persons are
exposed to radiation in excess of that permitted by relevant law or regulations.

Based upon the  foregoing  acknowledgments,  it is,  therefore,  agreed that the
Seller shall not incur any  liability  for personal  injury to any party arising
out of the operations and  maintenance of the Supplies  unless such liability is
solely  caused by a gross  negligence  on the part of the Seller in the  design,
implementation  or  documentation  including but not limited to maintenance  and
operation manuals for the Supplies. In order to give effect to these limitations
of the Seller's liability, and as an express condition of sale, the Buyer hereby
agrees to indemnify and hold the Seller  harmless  from any and all claims,  but
limited by the  exclusion  of  negligent  acts or  omissions  as outlined in the
preceding sentence, damages and liability, including reasonable attorney's fees,
arising  out of a claim  against the Seller for  personal  injuries of any party
occasioned by the operation and/or maintenance of such Supplies.


18. Liability for Consequential Damages

The Seller's  liability to the Buyer for damages howsoever caused shall under no
circumstances  whatsoever  (including  the decision of an  arbitration  panel or
court of law)  exceed  the  payments  actually  received  by the  Seller for the
Supplies  and the Seller shall under no  circumstances  have any  liability  for
special,  incidental,  indirect  or  consequential  damages,  including  without
limitation liability for loss of use, loss of profits, damage or injury to other
property or persons.



<PAGE>   19



19.  Infringement of Proprietary Rights

a) The Seller shall  indemnify  and hold  harmless the Buyer against any and all
losses,  liabilities  and  expenses,  by reason of any third party claim,  suit,
action or proceeding for alleged  infringement  of any  copyright,  trademark or
patent  of the  Buyer's  Country  or  alleged  conversion  of any  trade  secret
resulting from or arising in connection with the manufacture,  installation, use
or sale of the Supplies or any part thereof  including  any and all judgments or
decrees which may be rendered against the Buyer (and reasonable  attorney's fees
if Seller  should  fail to defend as  provided  in  subsection  b)  hereof,  and
settlements  made  arising out of any such  claim,  suit,  action or  proceeding
provided,  however  that this  indemnity  shall not  extend to any  infringement
resulting  from a breach  by the  Buyer  of this  Agreement  or of the  Seller's
instructions for the operation of the Supplies.  The Seller shall however not be
liable for any  infringement  or claim based upon the use of the Supplies or any
portion of the  documentation  in combination with other equipment or technology
not supplied by the Seller or resulting from any modification made by the Buyer,
without approval or instruction by Seller.

b) The Seller shall defend at its own expense all suits,  actions or proceedings
brought  against the Buyer with respect to the matters  listed in  subsection a)
above. The Buyer shall have the right at its option and at its sole expense,  to
participate  in the  defense  of any such  claim,  suit,  action or  proceeding,
without  relieving  the  Seller of any  obligation  hereunder.  The Buyer  shall
promptly  notify the  Seller in writing  after any such claim is made or suit is
brought and shall  cooperate with Seller in the defense  thereof as requested by
the Seller,  and the Seller  agrees to  reimburse  the Buyer for its  reasonable
out-of-pocket  expenses incurred at Seller's specific request in connection with
such  cooperation.  The  Buyer  shall  immediately  notify  the  Seller  of  any
infringement  claim made or  threatened  and shall refrain from any admission of
liability,  and will not  negotiate  or enter into any  settlement  without  the
Seller's prior consent.

c) If,  however,  as a  consequence  of a final  determination  of any  suit for
infringement  or any court decision  involving any injunction  resulting from or
arising in connection  with the  manufacture or sale of the Supplies or any part
thereof furnished or employed by the Seller hereunder,  the Buyer is enjoined or
limited  in any  material  manner in the use of said  Supplies  or part,  Seller
shall,  at its option and at its own expense either i) procure for the Buyer the
right to continue use of said Supplies or part, ii) so modify the Supplies or

<PAGE>   20


part so as to render them  non-infringing  without any significant effect to use
thereof, or iii) replace the Supplies or part with an equivalent  non-infringing
product.


20. Seller's and Buyer's Proprietary Information

Upon completion of the Acceptance  Tests,  the Seller shall furnish to the Buyer
free of charge  information,  manuals  and  drawings  in English and with metric
units of measure  relating  to the  Supplies  and  instructions  to the Buyer in
sufficient  detail to enable the Buyer and its employees to operate,  calibrate,
maintain and repair the Supplies and all parts thereof.  A definitive version of
the documentation,  including the modifications that are specific to the Buyer's
configuration and that are made during the final stages of installation, will be
provided six (6) months after the  completion  of the  Acceptances  Tests.  Such
information,  manuals,  drawings  and  instructions  and the  written  materials
furnished  by the Seller to the Buyer  under the Section  entitled  "Preparatory
Work"  hereof shall remain the property of the Seller and the Buyer shall have a
royalty-free  license  to  use  the  same  in  connection  with  the  operation,
calibration, maintenance and repair of the Supplies. The Buyer shall not use any
of the proprietary information supplied by the Seller for any other purpose than
the operation, calibration, maintenance and repair of the Supplies and the Buyer
shall not register, apply for registration or attempt to acquire any other legal
protection  for the said  proprietary  information in its own name, or any other
name,  or take any  action  which may  affect  the  Seller's  rights,  title and
interest in and to the  technology in any country,  without  obtaining the prior
consent of the Seller.  The Buyer shall treat such  information and materials in
the same  manner  as it  treats  its own  proprietary  information  and will use
similar  means to  protect  it from  unauthorized  disclosure.  The  same  Buyer
covenants and agrees that the contents of such written  information or materials
shall  not be  divulged  to any other  person,  firm or  corporation,  except as
allowed above.

The Seller agrees that all  information  transmitted  from Buyer to Seller under
this contract  including but not limited to,  information  relating to research,
development, manufacturing, testing, accounting and marketing will be considered
confidential  information.   This  confidential  information  will  be  held  in
confidence and not disclosed to third parties by the Seller.  This  confidential
information  shall be held in  confidence by the Seller using the same degree of
care as the Seller uses in  protecting  its own  confidential  information.  The
Seller shall only use such  confidential  information for the purpose of meeting
its obligations under this Agreement.



<PAGE>   21



21. Destruction of Supplies

In the event that prior to the delivery of the Supplies,  the Supplies are lost,
destroyed  or  damaged  to such an extent  that  they  cannot  be  repaired  and
delivered  in  accordance  with the  delivery  schedule set forth in the Section
entitled "Installation of Supplies",  provided the event is not a willful act of
the Seller, the time reasonably  required by the Seller to furnish a replacement
for the  Supplies or to  accomplish  such  repairs  shall be deemed an Excusable
Delay under the Section entitled  "Excusable  Delay" and the Seller shall not be
deemed to be in default or to have breached its duties hereunder.



22. Excusable Delay

Notwithstanding anything to the contrary herein contained, if the performance of
this  Agreement  by any  party  or the  obligation  of any  party  hereunder  is
prevented,  restricted  or  interfered  with by reason of : i) fire,  explosion,
strike,  lockout,  labor  dispute,  casualty  or  accident,  epidemic,  cyclone,
drought,  flood or ii) war,  revolution,  riot, civil commotion,  acts of public
enemies,  blockage  or  embargo,  or iii) any law or  proclamation,  regulation,
ordinance, demand or requirement of any applicable government or any subdivision
thereof  or  representative  of any  such  government,  or iv)  any  other  acts
whatsoever,  whether  similar  or  dissimilar  to those  enumerated,  beyond the
reasonable  control of a party  hereto,  then,  and in that event,  the party so
affected  shall  promptly  notify the other  party of all  reasonable  resulting
difficulties.  Upon such notice,  the disabled party shall,  for the duration of
its disability (referred to as "Excusable Delay" in this Agreement),  be excused
from the performance of such of its obligations as are prevented, restricted, or
interfered  with  by  reason  of the  occurrence  of any  of  the  events  above
enumerated  and such  party  shall  not be deemed to be in  default  under  this
Agreement  nor be subject to any  liability  or damage.  The time period  during
which any party is to perform  under this  Agreement  shall be  extended  by the
period of any Excusable Delay. Excusable Delay under the same terms occurring in
respect to the Seller's  sub-contractors  shall be deemed to be Excusable  Delay
occurring to the Seller.

If the Seller is prevented from proceeding according to any of the schedules set
out in this Agreement by the Buyer's fault, by a delay on the part of the Buyer,

<PAGE>   22


or by a regulatory body with jurisdiction over the Buyer's site, or if the Buyer
delays a payment or the issuance of a Letter of Credit  pursuant to Section 3 by
more than fifteen (15) days past the due date,  then all the dates  contained in
this  Agreement  for  completion  by the Seller of its  obligations  and rights,
including but not limited to the right to exercise the accelerated  delivery and
acceptance  option,  shall be  postponed  by an  additional  period equal to the
delay.


23. Termination for Insolvency

In the event that either the Buyer or the Seller :

a) makes a general assignment for the benefit of creditors or becomes insolvent;

b) files an insolvency petition in bankruptcy ;

c) petitions for or acquiesces in the  appointment  of any receiver,  trustee or
similar officer to liquidate or conserve its business or any substantial part of
its assets ;

d) commences,  under the laws of any jurisdiction,  any proceeding involving its
insolvency,  bankruptcy,   reorganization,   adjustment  of  debt,  dissolution,
liquidation  or any other  similar  proceeding  for the  release of  financially
distressed debtors ; or

e) becomes a party to any proceeding or action of the type described above in c)
or d) and such proceeding or action remains undismissed or unstayed for a period
of more than sixty (60) days,


then the other party may, by written notice, terminate this Agreement.


24. Spare Parts

The Seller agrees to make available to the Buyer,  as the Buyer may from time to
time require, _____________, spare parts and components to the Supplies, and the
Seller  agrees  to  exert  reasonable  efforts  to  meet  the  Buyer's  delivery
requirements  for said parts and  components  or acceptable  substitutes.  It is
understood  that the  parties  shall  negotiate  in good  faith  reasonable  and
mutually agreeable prices for said spare parts and components.



<PAGE>   23



25. Technical Assistance by the Seller

Immediately  following the  successful  completion of the  Acceptance  Tests the
Seller  shall send one of its  specialists  to assist the Buyer in bringing  the
cyclotron to full  operational  capacity.  The  specialist  shall be the project
coordinator  or, if he is not  available,  someone of equal or better  technical
expertise,  this other person to be approved by the Buyer,  such approval not to
be unreasonably  withheld. The Seller's specialist will remain at the site for a
period of 28 days unless the Buyer  agrees that the  services of the  specialist
are no longer required.  During this period,  the Buyer's specialist will define
the tasks to be  performed  by the  Seller's  specialist  with the  objective of
verifying  the  cyclotron  1) is fully  operational,  2) performs  according  to
specifications  within the production  environment and 3) its automated  control
system performs according to specifications. This period of technical assistance
does not relieve the Seller of any of its warranty  obligations,  including  the
requirement  that the Seller  send any  personnel  required  to the Site to make
repairs  should the  Supplies  be found to not meet  specifications  during this
period.


26. Entire Agreement

This Agreement,  made in two originals,  one for each party, contains the entire
agreement  between the parties and shall  supersede all previous  communications
and  agreements,  whether oral or written,  with  respect to the subject  matter
hereof and the provisions  hereof may not be modified or superseded except by an
instrument in writing signed by a duly authorized  officer or  representative of
each of the parties hereto.


27. Authorization

By virtue of having  affixed  their  respective  signatures  below,  each of the
parties  hereto  warrants  that it has obtained all  authorization  necessary to
enter into and perform its obligations under this Agreement.


28. Effective Date

This Agreement  shall become  effective as of the date upon which payment i), as
set forth in Section entitled  "Purchase Price of the Supplies",  is received by
the Seller.



<PAGE>   24



29. Disputes

With respect to any  controversy  arising out of or relating to this  Agreement,
such controversy shall be settled by final and binding  arbitration in New York,
NY,  USA,  in  accordance  with the  then-existing  rules (the  "Rules")  of the
American Arbitration Association ("AAA") and judgment upon the award rendered by
the  arbitrators  may be  entered  in any  court  having  jurisdiction  thereof;
provided,  however,  that the law applicable to any  controversy  and the law by
which this  Agreement  shall be construed  and governed  shall be the law of the
State  of New  York,  regardless  of its or  any  jurisdiction's  choice  of law
principles.  In any  arbitration,  pursuant  to this  Agreement,  the  award  or
decision  shall  be  rendered  by a  majority  of  the  members  of a  Board  of
Arbitration  consisting of three (3) members,  one of whom shall be appointed by
each  party  and the  third of whom  shall be the  Chairman  of the panel and be
appointed by mutual agreement of said two  party-appointed  arbitrators.  In the
event of failure of said two  arbitrators  to agree upon the  appointment of the
third  arbitrator   within  sixty  (60)  days  after  the  commencement  of  the
arbitration  proceeding,  the third  arbitrator shall be appointed by the AAA in
accordance  with the Rules. In the event that either party shall fail to appoint
an arbitrator  within thirty (30) days after the commencement of the arbitration
proceeding,  such arbitrator and the third  arbitrator shall be appointed by the
AAA in  accordance  with the  Rules.  The  Rules of  Evidence  and the  Right to
Discovery shall be applicable to both parties.

Work under this Agreement shall continue during the arbitration  proceedings and
payments due to the Seller shall not be withheld on account of such  proceedings
unless such  particular work or payment is the subject matter of the arbitration
in which case this provision shall not apply to such particular work or payment.

The parties agree to equally share the expenses associated with this arbitration
procedure.


30. Governing Laws

This Agreement  shall be governed by and construed in all respects in accordance
with the laws of the State of New York, USA.



<PAGE>   25



31. Notices

a) Any notice  given under this  Agreement  shall be made in  writing,  shall be
given by first class air mail,  telex,  telecopier or commercial cable and shall
be addressed to :

In the case of the Seller:
      Ion Beam Applications
      Chemin du Cyclotron, 3
      1348 Louvain-la-Neuve
      Belgium
      Attn : Mr. Yves Jongen
      Fax Number : 32-10-47.58.10

In the case of the Buyer :
      Theragenics Corporation
      5325, Oakbrook Parkway
      Norcross, GA 30093
      USA
      Attn : Mr. Glenn Dill
      Fax Number : 1 (404) 381 84 47

Either party,  by written  notice to the other,  may change the address to which
notices will be directed.

b) Any notice shall be deemed given on the date personally  delivered or sent by
telex,  telecopier or cable and fifteen (15) days after the date of mailing,  if
mailed.


32. Project Coordinator

Upon signing this Agreement,  both parties shall designate a representative  who
will act as Project  Coordinator  and official  addressee for all  communication
resulting from this  Agreement,  other than any official  notice given under the
Section  entitled   "Notices".   All  requests  for  service,   transmittals  of
information,  reports on training  activity,  and other  communication  required
under this  agreement  shall be sent by and directed to the  respective  Project
Coordinators. Informal conversations occurring person-to-person or by phone,

<PAGE>   26


requests and  information  shall be validated by an appropriate  written form as
confirmation.  Any communication sent to others than those designated as Project
Coordinators,  or in a  manner  not in  accordance  with the  Notices  procedure
specified in this Agreement will be considered as informal and non-existent.


33. Assignment

This  Agreement  shall inure to the  benefit of and be binding  upon each of the
parties hereto and their  respective  successors and assignees,  but neither the
rights nor the duties of either party hereunder may be assigned,  in whole or in
part by either party, without the prior written consent of the other party. Such
consent shall not be unreasonably withheld by either party. Any assignment shall
not relieve the assignee of any of the Agreement obligations of the assignor.


34. Headings

The headings  contained  within this  Agreement are  established  solely for the
convenience  of the  two  parties  and  are not  intended  to and do not  limit,
construe or modify any of the terms and conditions included hereof.


35. Severability

If  any  term  or  provision  of  this  Agreement  is  held  to  be  illegal  or
unenforceable, then this Agreement, except for such part or parts thereof, shall
continue to be in full force and effect.

In the event of any  inconsistency  between a provision of the conditions of the
Agreement and the content of an Appendix to this  Agreement,  and if the parties
cannot  agree on the  clause to take  precedence,  the AAA of Section 29 will be
asked to  mediate/arbitrate  the dispute  and the parties  agree to abide by the
finding of said association.



36.  Non-Waiver

The failure by either party to enforce at any time or for any period of time any
of the  provisions  hereof shall not be a waiver of such  provisions  nor of the
right of such party thereafter to enforce each and every such provision.


<PAGE>   27


IN WITNESS  WHEREOF,  the parties  have caused this  Agreement to be executed in
duplicate by their duly qualified officers or representatives.

THERAGENICS CORPORATION Inc.

Not Required
Christine Jacobs
President

/s/ Bruce Smith                                      /s/ Glenn Dill
Bruce Smith                                          Glenn Dill
Chief Financial Officer                              Director of Operations

ION BEAM APPLICATIONS, S.A.

 /s/ Yves Jongen                                     /s/ Sabine de Voghel
Yves Jongen                                          Sabine de Voghel
President                                            Area Sales Manager




<PAGE>   28

                                APPENDIX                             
                                                                    
                            CYCLOTRON PARAMETERS                       

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission
                                                                        
                                                                        
 
                                                         METHOD OF VERIFICATION
 BEAM                                                   FOR THE ACCEPTANCE TESTS
                                                             not required
                                                             calculated
                                                             measured
                                                             rationale
                                                             calculated
 POWER CONSUMPTION                                         
                                                             measured
                                                             measured
 MAGNETIC STRUCTURE                                        
                                                             value provided
                                                             value provided
                                                             value provided
                                                             value provided
                                                             value provided
                                                             value provided
                                                             value provided





Theragenics/IBA Contract - Cyclotron #7 - _____________ - p.1

<PAGE>   29

The Seller agrees that if the Buyer develops at its own expense a
______________ to ___________, and if the device does not interfere or
compromise the functioning of this _______, the Seller will cooperate with the
Buyer to integrate this __________ into its design _________.


 R.F. SYSTEM
                                                                 value provided
                                                                 value provided
                                                                 value provided
                                                                 value provided
                                                                 value provided
                                                                 value provided
                                                                 value provided
                                                                 value provided
                                                                 value provided
 ION SOURCE                                                     
                                                                 verified
                                                                 value provided
 The Seller agrees to provide _______________________.





Theragenics/IBA Contract - Cyclotron #7 - _____________ - p.2

<PAGE>   30

 GENERAL DIMENSIONS
                                                                  value provided
                                                                  value provided
                                                                  value provided
                                                                  value provided
 WEIGHT                                                             
                                                                  value provided
 VACUUM SYSTEM
 The Buyer will make its best effort to have _____ whenever possible.

 CONTROL SYSTEM


 STRAY BEAM CONTROL


 WATER MANIFOLD
         The water manifold will be __________________________.





Theragenics/IBA Contract - Cyclotron #7 - _____________ - p.3
<PAGE>   31

                                    APPENDIX

                           ________ TARGET PARAMETERS

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission


                                                         METHOD OF VERIFICATION
 TESTS                                                      FOR THE ACCEPTANCE
                                                               calculated 
                                                               measured   
                                                               measured   
                                                               calculated 
                                                               specified  
                                                               specified  
                                                               measured*  


Notes:
         1)      It is understood the Seller will make its best effort to
                 ____________.

         2)      The Buyer understands the _____________ to be delivered is to
                 function at ____________.  The Seller will however consider
                 the possibility of ______________ and if this can be done 
                 _______________, will _________________.

* to be measured after completion of the Acceptance Tests





Theragenics/IBA Contract - Cyclotron #7 - _____________ - p.4
<PAGE>   32

                                    APPENDIX

                             BUILDING REQUIREMENTS

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission


 A.       RECOMMENDED ROOM CONFIGURATION


 1.       CYCLOTRON VAULT

 Inside dimensions:

 Recommended vault shielding:

 Floor loading:
 Floor drains:                   As required by local code & subject to health 
                                 safety rules

 Temperature limits:

 Humidity limits:
 Power dissipated in the air:

 Lifting eyebolts and anchoring points shall be installed in the vault
 according to IBA specifications, if required.


 2.       POWER SUPPLY AND CONTROL ROOM

 Inside dimensions:
 Temperature limits:

 Humidity limits:

 Power dissipated in the air:
 The door height for the insertion of the Supplies shall be more than 5 cm
 higher than that of the Supplies.

 Power supply, control and cyclotron rooms will be located close to each other
 to avoid long cables and shall not be more than 30 meters away from each
 other.


 3.       CYCLOTRON COOLING SYSTEM REQUIREMENTS

 The cooling system should be located as close to the cyclotron vault as
 possible, with access to a water supply.

A ___________ is sufficient to accommodate the heat exchanger, column and pump.





Theragenics/IBA Contract - Cyclotron #7 - _____________ - p.5
<PAGE>   33

 Locating the cooling system on a different level from the cyclotron's is
 possible to a maximum height difference of __________ the cyclotron median
 plane _____________.

 The area should be easily accessible for servicing the equipment.


 B.       SERVICES SPECIFICATIONS

 1.       ELECTRICAL POWER

 _________, other voltages possible if specified within two weeks of the time
 of order.  
 ______________.

 ______________.

 Voltage to be nominal ____________.
 
 Delivered to IBA's power distribution cabinet in the power supply room.

 The Buyer shall provide, install and terminate the power cables to the "mains"
 connection (AC power input) of all IBA power distribution cabinets in
 accordance with local electrical code requirements.


 2.       COOLING, SECONDARY LOOP

 Water requirements (chiller loop):

 Flow:

 Temperature:

 Power to be removed:

 D P:

 ____________ water has to be delivered in the cooling room ___________.
 Drains according to local building codes should be included.


 3.       COMPRESSED AIR

 Pressure:

 Quality:

 Average flow:

 Peak flow:

 Outlets must be provided.





Theragenics/IBA Contract - Cyclotron #7 - _____________ - p.6
<PAGE>   34

 4.       ____________ FOR CYCLOTRON VENTING

 Pressure:

 Quantity:


 5.       _____________ FOR THE ION SOURCE

 Pressure:

 Quantity:

 Quality:





Theragenics/IBA Contract - Cyclotron #7 - _____________ - p.7
<PAGE>   35

                                    APPENDIX

                       BUILDING COMPLETION SPECIFICATIONS

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission


The building shall be fully completed and shall have been accepted by the
Seller prior to the arrival of both the Seller's team and the equipment
necessary for the installation of the Supplies.  The Seller will start
installation work when the following conditions have been complied with to
Seller's reasonable satisfaction.

A "Site Acceptance Document" will be provided by the Seller to the Buyer and
will list the mutually agreed progress of the site reaching specification.

1.       CONCRETE

All concrete must cure for at least ________ prior to arrival of the Supplies
and related equipment in order to avoid _______________ problems.


2.       PIPES AND CABLES

All conduits, cable trenches, raceways, cable trays and related equipment shall
be installed by the Buyer prior to equipment arrival.  Cables and pipes shall
be relayed to the various working areas by way of a _________ having a
____________, built in accordance with relevant electrical standards.  The
_______ shall be equipped with cable ladders and/or cable ducts and be covered
(planks or galvanized roofing...).

The Seller shall provide detailed plans and recommendations regarding location,
size and number of trenches/pipes and cable trays that are required.

Cables and pipes for the ____________ shall be laid in different cable trays or
conduits from the cable trays or conduits housing the ___________.
_____________ cables are to be separately routed.

The Seller recommends that the trench be provided with ___________________.

______________ are needed for power cables, control cables, cyclotron system
water cooling pipes, vacuum system water cooling pipes, compressed air pipes,
gas pipes and ________________.

It is the Buyer's responsibility to ensure that the cable routing system meets
local electrical codes and requirements.





Theragenics/IBA Contract - Cyclotron #7 - _____________ - p.8
<PAGE>   36

3.       SERVICES

All services, as described in Appendix "Building Requirements", shall be
installed and made ready to be put into operation, before installation
commences.


4.       SECONDARY WATER COOLING CONNECTIONS

All piping from the Buyer's water cooling system must be installed.  Piping,
routed to locations suggested by the Seller, should have _______________ prior
to equipment installation.  A water make-up line should be provided.


5.       DUST

All floors, ceilings and walls including the inside of the trenches and other
openings shall be given a surface that minimizes dust generation.  It is
recommended that all surfaces be painted in a light color to improve visibility
and to promote safety.  All painting, sanding, placement of doors and windows
or similar will be completed.


6.       LIGHTING AND ELECTRICAL EQUIPMENT POWER

Suitable and sufficient lighting shall be provided in all work areas.  Standard
recommendations are as follows:

                -Vault
                -Power supply room
                -Control room

Emergency lighting should be available in all relevant areas.

Single phase outlets shall be located at intervals of 3 meters or less in each
room where Seller's equipment will be installed.


7.       COMPRESSED AIR OUTLETS

Exact location for the compressed air outlet will be specified for the
particular application by the Seller to the Buyer in due time.





Theragenics/IBA Contract - Cyclotron #7 - _____________ - p.9
<PAGE>   37

8.       POWER SUPPLY AND CONTROL ROOM FLOORING

This room requires a raised or "computer type" flooring.


9.       VENTILATION

The control and power supply rooms will be air-conditioned to ensure optimal
operation of the electronic equipment.  The other areas will be ventilated and
heated when necessary.  Ventilation conditions and other conditions, shall be
organized according to the current regulations in the Buyer's country.  The
relative humidity level will not exceed ____% in all relevant areas.  The
passageways of ventilation ducts in the walls shall comply with the
________________.


10.      HEATING

A temperature at ________ will be maintained in all relevant areas during the
installation and testing of the equipment.


11.      RADIATION PROTECTION

While the Seller can offer building design suggestions, the entire
responsibilities for meeting all local codes and regulations regarding
radiation protection remain with the Buyer.  The building and all work areas
will comply with all relevant safety standards concerning radiation protection
during all phases of construction, installation, testing and operation.  The
Buyer will be responsible for installation plans of a radiation protection
system in accordance with local codes and regulations.


12.      INFRASTRUCTURE & SERVICES

The Seller requires sufficient office space, tool storage, locker, furniture
and shower facilities for its personnel during the period of installation and
testing.  Construction site access must also meet the approval of the Seller's
engineer.

The Buyer must, at his own expense arrange for the destruction, pick-up and/or
clearing away of all waste, including Seller's Supplies packaging except
radioactive waste which will be handled as follows.  The Buyer agrees to
provide an uncontaminated area directly in front of the cyclotron vault that
can be used for unpacking components of the Supplies during assembly with the
understanding that all packing materials and other waste must be removed from
this area before the start of beam tests at which time the area in front of the
vault will be incorporated into the contaminated Hot Maintenance Area.  The
Buyer will also provide appropriate disposable protective clothing and gear for
Seller's personnel during installation and testing and will at its own expense
dispose of all such protective clothing and gear.  The Buyer will also at its
own expense dispose of one 55 gallon drum of solid radioactive waste produced
by Seller's personnel during installation.  For any additional





Theragenics/IBA Contract - Cyclotron #7 - _____________ - p.10
<PAGE>   38

radioactive waste produced by Seller's personnel during the installation
process, the Buyer and Seller agree to equally share the cost of disposal up to
a maximum of ____________ paid by the Seller.

Besides the maintenance of the building site, providing security and fire
protection is also the Buyer's responsibility.


13.      COMMUNICATION AND SURVEILLANCE EQUIPMENT

An intercom system shall interlink the ______________.  It would be useful to
be able to communicate from the ____________.  It is suggested that a
________________ be used in the ___________ for personnel safety.


14.      INSERTION OF THE SUPPLIES

a)       An appropriate opening through the wall shall be made in the cyclotron
         vault to allow for passage of the cyclotron.  This opening shall be
         closed by the Buyer as soon as the cyclotron will have been rigged
         into the cyclotron vault as closing of the opening is necessary for
         progressing with the installation of the Supplies.  The inside surface
         of the vault closing will be finished within 5 days after the
         cyclotron has been place in its final location.

b)       A maneuvering area for a heavy trailer ______________ unloading and a
         covered area ____________ for the assembly of the major components of
         the Supplies must be provided for in front of the opening outside the
         vault with adequate access to nearby roads.

         The covered area shall be such as to be able to serve as storage area
         for the rest of the Supplies while the cyclotron is rigged and the
         opening in the vault is closed.  Its floor shall support the use of a
         three-ton forklift truck.

         The ground of the cyclotron vault and of the unloading area shall be
         surfaced with reinforced concrete capable of withstanding the
         necessary maneuvering of the cyclotron into position.

c)       All doors, corridors and other passageways leading to the control room
         or any other room where Seller's equipment will be installed shall be
         cleared so as to allow transportation of the Seller's equipment by
         mean of a three-ton forklift truck or a similar transportation vehicle
         from the unloading area to the place of final installation of the said
         equipment.

d)       For unloading and installation of additional equipment delivered to
         the Site during the installation period, the Buyer shall prepare
         building access and surroundings in order to allow access and
         unloading of 10-ton trucks (unloading platform if possible).  It must
         be possible to perform the trucks unloading and the introduction of
         the additional equipment in the building with a hand-lift.  The
         possibility to use the Buyer's fork-lift if needed would be
         appreciated.





Theragenics/IBA Contract - Cyclotron #7 - _____________ - p.11
<PAGE>   39

15.      CONSULTING SERVICES

Typically, prior to the issuance of a purchase order or execution of some other
form of purchase agreement, the Seller will have prepared a preliminary layout
of the Buyer's facility and furnished various data regarding required building
services.  After the purchase agreement has become effective, the Seller,
without additional charge, will make a final layout and prepare such other
plans and memoranda necessary to transmit data to the Buyer's architects and
engineers.  Similarly, the Seller, without additional charge, will review the
initial set of architectural and engineering drawings and minor revisions
thereof.  However, the time devoted to preparation by the Seller's personnel of
additional layouts or drawings and/or reviews of revised sets of architectural
and engineering drawings will be invoiced at the Seller's regular rates.  No
additional charge will be made for telephone consultations.  Travel and related
expenses incurred as a result of attendance by the Seller personnel required at
meetings outside of Belgium with the Buyer's architects, engineers, consultants
and/or representatives will be reimbursed by the Buyer.  With respect to the
foregoing, the responsibility for determining whether conflict exists between
local building codes and/or other laws or government regulations and the
content of drawings, data sheets, memoranda or other forms of communication
submitted by the Seller is solely the responsibility of the Buyer, his
architects, engineers and/or consultants.





Theragenics/IBA Contract - Cyclotron #7 - _____________ - p.12
<PAGE>   40

                                    APPENDIX

                              INCLUDED SPARE PARTS

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission




The following spare parts are included in the total purchase price of the
Supplies:



         -other miscellaneous spares for a value of __________, to be specified
          by the Buyer.





Theragenics/IBA Contract - Cyclotron #7 - _____________ - p.13
<PAGE>   41

                                    APPENDIX

                              ACCEPTANCE CRITERIA

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission


The Buyer is prepared to purchase the Supplies because the Seller has
represented that they will possess certain characteristics which make them
useful and of value to the Buyer.  The following Acceptance Criteria embody the
Buyer's understanding of these characteristics and therefore the Buyer's
willingness to purchase the Supplies is predicated upon the Supplies actually
having these characteristics.  The Acceptance Tests which follow are intended
to establish whether or not the Supplies are likely to possess these
characteristics and consequently determine if the Buyer should pay the full
agreed price for the Supplies.

Acceptance of the Supplies by the Buyer requires that they meet the following
minimum criteria as demonstrated by the Acceptance Tests:

1.       The Supplies must conform with the parameters set out in the Appendix.
"Cyclotron Parameters" and the Appendix "______________ Target Parameters."

2.       All of the items making up the Supplies must function together in a
way which provides reliable, continuous operation with _________________.  This
performance must be sustainable over a routine production schedule defined as
_______________.  Furthermore, the ___________________.

3.       The target system must be designed so that it efficiently utilizes the
protons impinging the target.  The rate of Pd-103 production in the rhodium
target must meet or exceed __________.  If the rate of production is determined
during the Acceptance Test to be _____________ of the above production rate,
the Seller may correct the deficiency by _____________, i.e., the guaranteed
intensity as referred to in Appendix "Cyclotron Parameters".

4.       Void.

5.       Routine operation as defined in Item 2 above must not lead to
structural damage to internal components of the cyclotron or the target
assembly due to interactions between the beam and such components.

6.       The radiation level within the cyclotron must not increase as a result
of proton and neutron activation and target evaporation to a level which makes
it unsafe to maintain and service the internal components.

7.       The target handling device shall reliably remove the ______________
target from the cyclotron and place it into a shielded container for manual
transfer to the target processing laboratory.  The operation of the target
handling device shall be _______________________.  A written procedure,
providing adequate radiation protection, shall be prepared in case it is
necessary to _________________.  The rhodium surface and all other surfaces of
the target handling system





Theragenics/IBA Contract - Cyclotron #7 - _____________ - p.14
<PAGE>   42

shall be shielded so an operator can safely enter the cyclotron vault to
transfer the shielded target out for processing.





Theragenics/IBA Contract - Cyclotron #7 - _____________ - p.15
<PAGE>   43

                                    APPENDIX

                                ACCEPTANCE TESTS

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission

The following tests were developed based on experience gained through the
operation of the first three IBA __________ cyclotrons.  They provide a
reasonable test of the functionality of the Supplies and when combined with the
Technical Assistance provided by the Seller as called for in Section 25 of the
Contract, should provide the Buyer a fully functional cyclotron properly
integrated into Buyer's production environment.

All radiation monitoring and measuring equipment used in these tests will be
provided by the Buyer.  All targets and the _________ are the Buyer's
responsibility and at its own expense.

Test 1.  The Supplies shall be demonstrated to comply with the specifications
set out in the Appendix "Cyclotron Parameters" and the Appendix "___________
Target Parameters" by the means specified in the Appendices.

Test 2.  When the Supplies have been declared fully operational by the Seller,
the target handling device shall be cycled through a complete transfer from
demounting a fully installed target as it would be installed for a production
run through placing the target into a shielded container and the container
closed.  This portion of this test shall be deemed passed when ___________ have
been completed.  The target shall be transferred from the cyclotron to the
shielded container 5 times following the routine procedure for
__________________.

Test 3.  When the Supplies are fully installed and Tests 1 and 2 have been
successfully completed, the Supplies must operate for ____________________.
The target must then be removed and inspected in the hot cell to determine that
the beam strike was on target, _________________.  When the Buyer concurs in
writing, such concurrence not to be unreasonably withheld, that the Supplies
performed according to the specifications, the Supplies will be deemed to have
been accepted and Seller become eligible for the Acceptance Payment.





Theragenics/IBA Contract - Cyclotron #7 - _____________ - p.16
<PAGE>   44

                                   APPENDIX

                  ACCELERATED DELIVERY AND ACCEPTANCE OPTION

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission


The Buyer has the option to request to the Seller, at any time during this
Agreement, to work on an accelerated schedule basis in order to have the
Supplies accepted at an earlier date than the scheduled acceptance date of
__________________.  Official request must be made in writing and addressed to
Yves Jongen, President of IBA.

In the case the Buyer exercises this option, the Buyer will pay the Seller an
additional sum of ___________ for each complete day between the actual date of
early acceptance and ______________, including the day of
_______________________.





Theragenics/IBA Contract - Cyclotron #7 - _____________ - p.17

<PAGE>   1

                                EXHIBIT 10.23(d)

                               Purchase Agreement
                                     between
                             Theragenics Corporation
                                       and
                           Ion Beam Applications s.a.
                                      dated
                                December 27, 1996


Confidentialportions of this  document have been blanked out and have been filed
            separately with the Securities and Exchange Commission.

<PAGE>   2










                               Purchase Agreement

                                     between

                          Theragenics Corporation Inc.

                                       and

                           Ion Beam Applications S.A.

                                       for

                       _______________ Cyclotron Number 8

                                       and

                            Related Target Equipment








<PAGE>   3


                                Table of Contents

Purchase Agreement

1.  Interpretation............................................................3
2.  Subject Matter of Sale....................................................4
3.  Purchase Price of the Supplies............................................5
4.  Title and Risk of Loss....................................................7
5.  Delivery..................................................................7
6.  Installation of Supplies..................................................7
7.  Preparatory Work..........................................................9
8.  Acceptance...............................................................11
9.  Transportation and Insurance.............................................13
10. Export Documents, Duties and Foreign Taxes...............................14
11. Customs Duties, Buyer's Country Taxes and Import Permits.................14
12. Warranty As To Title.....................................................14
13. Design and Performance Warranty..........................................15
14. Material and Workmanship Warranty........................................15
15. Logging of Operations....................................................16
16. Training.................................................................16
17. Disclaimer of Liability for Personal Injury..............................16
18. Liability for Consequential Damages......................................17
19. Infringement of Proprietary Rights.......................................17
20. Seller's and Buyer's Proprietary Information.............................19
21. Destruction of Supplies..................................................19
22. Excusable Delay..........................................................20
23. Termination for Insolvency...............................................21
24. Spare Parts..............................................................21
25. Technical Assistance by the Seller.......................................21
26. Entire Agreement.........................................................22
27. Authorization............................................................22
28. Effective Date...........................................................22
29. Disputes.................................................................22
30. Governing Laws...........................................................23
31. Notices..................................................................23
32. Project Coordinator......................................................24
33. Assignment...............................................................25
34. Headings.................................................................25
35. Severability.............................................................25
36. Non-Waiver...............................................................25

Appendices

Cyclotron Parameters
____________ Target Parameters
Building Requirements
Building Completion Specifications
Included Spare Parts
Acceptance Criteria
Acceptance Tests
Accelerated Delivery and Acceptance Option




<PAGE>   4


                               Purchase Agreement


AGREEMENT  made as of this 27th day of  December  1996 by and  between  ION BEAM
APPLICATIONS,  S.A., a corporation  organized under the laws of Belgium,  having
its principal  office at Chemin du Cyclotron 3, 1348  Louvain-la-Neuve,  Belgium
(hereinafter  called the "Seller",  which expression includes its successors and
permitted assignees) and THERAGENICS CORPORATION, having its principal office at
5325 Oakbrook  Parkway,  Norcross,  Georgia 30093, USA  (hereinafter  called the
"Buyer", which expression includes its successors and permitted assignees).

WITNESSETH :

WHEREAS, the Seller wishes to sell to the Buyer and the Buyer wishes to buy from
the  Seller,  the  Seller's  model  ________________________  cyclotron, related
______________________ targetry equipment and spare parts therefore, all as more
particularly described herein : and

WHEREAS,  the Buyer wishes the Seller to assemble,  install,  start up, test and
make operational the _______________ cyclotron to be purchased including related
equipment and the Seller is willing to undertake this task : and

NOW, THEREFORE,  in consideration of the mutual covenants herein contained,  the
parties hereto agree as follows :


1. Interpretation

In this Agreement, unless the contrary intention appears :

"Acceptance" means the process whereby the Seller demonstrates to the Buyer that
the Supplies provided meet the requirements of the Agreement. This process shall
consist of a series of tests,  the  "Acceptance  Tests" as  defined in  Appendix
"Acceptance   Tests",   which  demonstrate  the  Supplies  meet  the  guaranteed
specifications, the Acceptance Criteria.


<PAGE>   5


"Acceptance  Criteria"  mean the  guaranteed  specifications  of the Supplies as
defined in Appendix "Acceptance Criteria".

"Acceptance  Date"  means the date on which the Buyer  agrees  that based on the
Acceptance  Tests, the Supplies have met the Acceptance  Criteria . The Supplies
shall be deemed  accepted  when the Buyer and Seller  agree in writing  that the
Acceptance Tests have been successfully completed.

"Acceptance Tests" are the tests listed in Appendix "Acceptance Tests".

"Agreement" means this document and includes its Appendices.

"Buyer's Country" means the country where the Site is located.

"Day" means calendar day;  "Week" means  calendar  week;  "Month" means calendar
month.

When the last day of any period  prescribed  for the execution of any assignment
falls on a day which is not a working day in Belgium or in the Buyer's  Country,
the  assignment  may be  performed  on  the  first  working  day  following  the
aforementioned day.

"Effective Date" has the meaning set forth in Section entitled "Effective Date".

"Excusable  Delay"  has the  meaning  set forth in Section  entitled  "Excusable
Delay".

"Site" means the Buyer's facility in Buford, Georgia, USA.

"Supplies" means all equipment,  hardware, software (including installation) and
the  associated  documentation,  support  equipment  and services to be provided
under the Agreement, as detailed in Appendix "Cyclotron Parameters" and Appendix
"____________ Target Parameters."



<PAGE>   6



2. Subject Matter of Sale

Subject to the terms and conditions of this Agreement :

a) The Seller  shall sell and deliver to the Buyer and the Buyer shall  purchase
from  the  Seller  (i)  a  ________________ model  cyclotron,   the    technical
specifications  of which are more fully  described  in the  Appendix  "Cyclotron
Parameters"  Appendix  hereto;  (ii)____________ target system,   the  technical
specifications   of   which   are  more   fully   described in     the  Appendix
"________ Target Parameters"  hereto;  and (iii) a set of spare parts  listed in
the Appendix "Included Spare Parts" hereto;

b) The Seller shall also assemble, install, start up, test, make operational and
perform the Acceptance Tests on the Supplies.

c) The  Seller  shall  send one of his  specialists  to assist in  bringing  the
cyclotron to full  operational  capacity after Acceptance of the Supplies by the
Buyer, as described in Section 25.

d) The Buyer and  Seller  agree  that an option  for  accelerated  delivery  and
acceptance as described in Appendix "Accelerated Delivery and Acceptance Option"
may be  exercised  by the Buyer.  In case that option is exercised by the Buyer,
the covenants of the "Accelerated Delivery and Acceptance Option" Appendix shall
be applicable to both parties.


3. Purchase Price of the Supplies

a) The  aggregate  purchase  price  (hereinafter  the "Price") of the  Supplies,
including  packaging,  insurance and transportation of the Supplies to the Site,
the  assembly,  testing and start up of the  Supplies  described  in the Section
entitled  "Subject  Matter  of  Sale"  above,  shall  be  ______________________
________________________. This price shall also include the technical assistance
by the Seller as  described in Section 25, the Spare Parts as listed in Appendix
"Included  Spare  Parts" and the Seller's  contribution  to the  applicable  USA
customs duty as stated in Section 11 of this Agreement.

b) As a down payment  equivalent to  ____________  has been made by the Buyer to
the Seller on November 6, 1996, the balance of the Price set forth in subsection
a) shall be payable as follows:


<PAGE>   7


     i) _____________________________________________________________________ to
be paid to the Seller upon execution of this Agreement;

     ii) ____________________________________________________________ to be paid
to the  Seller  on  March 1,  1997.  This  payment  shall  be  guaranteed  by an
irrevocable  standby  letter of credit to be issued in favor of and  approved by
the Seller within one month from the Effective Date.

     iii)   _____________________________________________________________ to  be
paid to the Seller on April 1, 1998.  This  payment  shall be  guaranteed  by an
irrevocable  standby  letter of credit to be issued in favor of and  approved by
the Seller by March 1, 1997.

     iv)  ___________________________________________________________ to be paid
to the Seller  within 15 days from  shipment  of the  Supplies as  evidenced  by
receipt of the  shipping  documents  and no later than  September 1, 1998 if the
shipment is delayed by Buyer's  fault.  This payment  shall be  guaranteed by an
irrevocable  standby  Letter of Credit to be issued in favor of and  approved by
the Seller by the date of shipping of the Supplies,  to be notified by Seller to
the Buyer at least 30 days in advance.

     v)  _________________________________________________________ to be paid to
the Seller within 15 days of the Acceptance of the Supplies.  This payment shall
be guaranteed by an  irrevocable  stand-by  Letter of Credit,  which can only be
exercised  during  the  year  following  the  delivery  of  the  Supplies,   and
conditioned  only  upon  successful  completion  of  the  Acceptance  Tests  and
providing  further  that,  in the event the Seller is  prevented  by the Buyer's
fault,  by a delay  on the  part of the  Buyer,  or by a  regulatory  body  with
jurisdiction over the Buyer from completing the Acceptance Tests for a period of
sixty (60) days or more,  payment  thereunder  to the Seller  shall be made upon
demand of the  Seller.  This  Letter  of Credit  shall be issued in favor of and
approved by the Seller,  such approval not to be unreasonably  withheld,  by the
date of  shipping  of the  Supplies,  to be notified by Seller to Buyer at least
thirty days in advance.

c) All  payments  by the Buyer to the Seller  under this  Agreement  shall be in
Belgian Francs and,  except those  specified in paragraph 3. b) above,  shall be
made by wire transfer within thirty (30) days from the date of invoice.


<PAGE>   8


d) All  payments  by the Buyer to the Seller will be deemed to have been made by
the Buyer on the date on which  the  Seller  has been  credited  for the  proper
amounts.  Any payment due to the Seller  which is not paid on the due date shall
accrue  interest for each started  month of delay at an annual rate of one point
above  the rate of the  "Avance  en Compte  Courant  Hors  Plafond  de la Banque
Nationale de Belgique" as published in "l'Echo" on the first day of such month.


4. Title and Risk of Loss

Except as indicated  below in this  paragraph,  title to the  Supplies  shall be
transferred  from the Seller to the Buyer when and to the  extent  payments  are
received by the Seller.  The Buyer  represents  and  warrants  that it shall not
cause or permit to be caused  any lien or  encumbrance  of any kind to be placed
upon the  Supplies  to an  extent  greater  than its share of  ownership  in the
Supplies.  It is  understood  that if the  Seller is unable to  demonstrate  the
Supplies  meet  the  Acceptance  Criteria  within  one year of  delivery  of the
Supplies to the Buyer's Site, clear title to the Supplies transfers to the Buyer
without  obligation to pay to the Seller the final payment  specified in Section
3.b.v unless the Seller has been prevented from conducting the Acceptance  Tests
as described in Section 8, last paragraph.

Risk of loss of any part of the Supplies shall pass from the Seller to the Buyer
upon delivery of such parts to the Site.


5. Delivery

The  Seller  shall  deliver  the  Supplies  to the Buyer at the Site and set the
Supplies in their final location.


6. Installation of Supplies

a) The assembly and  installation of the Supplies at the Site and the Acceptance
Tests are planned to be completed by _____________________________________ after
completion  of  Site  preparation  by  the  Buyer  at  the  Seller's  reasonable
satisfaction  as  evidenced  by  an  acceptance  document  of  the  Site  ("Site
Acceptance  Document")  signed by the  Seller,  whichever  is later.  The Seller
undertakes to make its best efforts to complete the installation and testing

<PAGE>   9


within this period.  During the  installation  period the Buyer shall permit the
Seller's  employees,  subcontractors  or  agents  unlimited  access  to the Site
provided said  individuals  comply with policies and procedures  established for
the Buyer's employees regarding such matters as health and safety issues.

b)  With  reasonable  notice  to  the  Seller,  the  Buyer  and  its  authorized
representatives  shall,  during reasonable working hours, be free to inspect the
quality and  conditions of the Supplies at the Seller's site during  fabrication
and at any time upon arrival of the same at the Site and during the installation
period.  The Seller will notify in writing to the Buyer when the major materials
are available for construction of the cyclotron.

c) The Buyer at its sole expense shall  provide the Seller with closed  premises
on or reasonably  near the Site in which the Seller may store employee  clothing
and tools and equipment required for the installation.  However,  the Buyer does
not assume any risk with respect to the loss or theft of any such items while on
the Buyer's premises.

d) The Buyer shall,  at its sole expense,  provide the Seller with the following
utilities  required for installation of the Supplies and Acceptance Tests on the
Supplies:  electricity,  water,  compressed  air,  dry  nitrogen for venting the
vacuum  chamber,  hydrogen  gas for the ion  source,  as  described  in Appendix
"Building Requirements".  Access to telephone and fax equipment connected to the
international network is required and the Seller will pay the charges associated
with the use of this line.  The Buyer shall provide all the necessary  radiation
measuring  equipment  required for the operation and the Acceptance Tests on the
Supplies.

e) Within  fifteen  (15) days from the date of delivery of the  cyclotron at the
Site, the Buyer shall permit the Seller to produce beams at full energy and full
intensity in the cyclotron vault.

f) The Price  reflects labor  provided by the Seller.  Any  additional  labor or
costs  required by local labor codes,  etc.  will be the  responsibility  of the
Buyer.

g) The Supplies are manufactured  according to Belgian technical  standards.  If
the Buyer requires compliance of the Supplies with specific technical standards,
these  technical  standards  must be notified by the Buyer to the Seller  within

<PAGE>   10


seven weeks of the Effective  Date. All  additional  costs related to making the
Supplies  conform to those norms or specific  standards  shall be charged to the
Buyer.


7. Preparatory Work

a) The Buyer shall have the sole  responsibility,  at its sole expense,  for the
work required to prepare the Site for installation of the Supplies. The building
to house the Supplies and the systems  contained  therein  shall comply with the
specifications   detailed  in  Appendix  "Building  Requirements"  and  Appendix
"Building Completion Specifications". As soon as possible after completion, and,
at the latest,  on  _________________,  the Seller shall prepare for the Buyer a
proposed  layout and prepare such other plans and  memoranda as are necessary to
transmit data to the Buyer's architects and engineers.  By _______________,  the
Buyer shall furnish to the Seller  drawings and plans for the Site including the
building and systems detailed in Appendix  "Building  Requirements" and Appendix
"Building  Completion  Specifications" in sufficient detail to enable the Seller
to judge  whether the Site will be  satisfactory  for the Supplies and will meet
the  specifications  detailed in Appendix  "Building  Requirements" and Appendix
"Building  Completion  Specifications".  Within four (4) weeks of the receipt of
this initial set of architectural and engineering drawings and plans, the Seller
shall provide the Buyer with  comments  thereon and detailed  information  as to
such modifications therein as the Seller deems necessary including such drawings
and  technical  documents  as may be  required  by the  Buyer  to  complete  the
installation of the cables,  cooling water and compressed air systems.  However,
the time devoted to preparation by personnel of Seller of additional  layouts or
drawings  and/or  reviews  of  revised  sets of  architectural  and  engineering
drawings will be invoiced at Seller's  regular rates. No additional  charge will
be made for telephone  consultations.  Travel and related expenses incurred as a
result of attendance by personnel of the Seller  required at meeting  outside of
Belgium   with   the   Buyer's   architects,   engineers,   consultants   and/or
representatives  will be reimbursed by the Buyer. With respect to the foregoing,
the  responsibility  for  determining  whether  conflict  exists  between  local
building  codes and/or other laws or government  regulations  and the content of
drawings,  data sheets,  memoranda or other forms of communication  submitted by
the Seller is solely the responsibility of the Buyer, his architects,  engineers
and/or  consultants.  The  definitive  drawings and plans for the Site,  made in
accordance  with  the  Seller's  comments  and  recommendations,  will  then  be
furnished by the Buyer to the Seller by  ________________.  In addition,  unless
otherwise specified, the Buyer shall have the sole responsibility for the design
and construction of the radiation monitoring systems, of the shielding required

<PAGE>   11


to prevent  radiation leakage and of the systems required to handle the disposal
of radioactive waste.

Any delay on the part of the Seller in meeting its  obligations  related to this
Section  by more  than ten (10)  days  will add a number  of days to the  period
provided for the  performance  by the Buyer equal to the number of days of delay
by the Seller.

b) Before  commencing  installation,  the Seller shall  inspect the Site and the
Buyer shall  submit to the Seller the Site  Acceptance  Document to be signed by
the Seller confirming that the preparatory work meets all the criteria set forth
in the Section entitled  "Installation of Supplies",  paragraph c) and d) and in
Appendix   "Building    Requirements"   and   Appendix   "Building    Completion
Specifications".   This   acceptance   document  only   indicates  the  Seller's
willingness to begin the  installation of the Supplies in the Buyer's  building.
It  does  not  discharge  the  Buyer  and  his  subcontractors  of any of  their
responsibilities   regarding  the  building.   The  Buyer  shall   complete  the
preparatory  work at the Site by  _______________.  If the  preparatory  work as
regards the cyclotron  vault is  substantially  completed  before that date, the
Buyer shall  accept  delivery  and/or  installation  of the  Supplies as soon as
possible under the applicable laws and regulations.  In the event that such work
has not been completed before that date, or if for any other reason the Buyer is
unable to accept delivery of the Supplies or  commencement  of the  installation
thereof by that date, the Buyer shall immediately give the Seller written notice
of this fact and the  anticipated  new date for  completion  of the  preparatory
work. In any case, the Seller may ship the Supplies to the Buyer at any time and
the  Buyer  shall  store  them  in one of its  warehouses  until  the  date  the
preparatory work is completed.

c) One week before  commencing  installation and setting of the cyclotron in its
vault,  the Buyer shall allow the Seller  full  access to the  cyclotron  vault,
power supplies and control room and all other rooms related to the  installation
of the Supplies to allow for the measurement of line-up marks to be performed.

d) The Buyer's completion,  to the reasonable satisfaction of the Seller, of its
undertakings  in this  section  and  elsewhere  in this  Agreement  relating  to
preparation of the Site and the continuous  furnishing of necessary services and
permits set forth in the Section entitled "Installation of Supplies",  paragraph
c), d) and e) and in Section entitled "Custom Duties,  Buyer's Country Taxes and
Import   Permits"   and  the   requirements   detailed  in  Appendix   "Building

<PAGE>   12


Requirements"  and  Appendix  "Building  Completion  Specifications"  shall be a
condition precedent to the Seller's commitment to perform within the time period
specified under the Section entitled  "Installation of Supplies" hereof, and any
delay or  interruption  by the  Buyer in  meeting  its  obligations  under  this
Agreement in a timely  fashion  shall extend the Seller's  time to perform under
this  Agreement  including  but not  limited to Seller's  time to  exercise  and
perform under the option for  accelerated  delivery and  acceptance  outlined in
Appendix  "Accelerated Delivery and Acceptance Option", by a period equal to the
period of the Buyer's delay or interruption plus, if shipment and/or delivery is
delayed by Buyer's  fault or at Buyer's  request,  an  additional  period not to
exceed four weeks to reschedule  shipment and/or delivery of the Supplies and/or
personnel as may be required.

In the event of any such delay or  interruption,  the Buyer will  reimburse  the
Seller for any  reasonable  costs  incurred as a direct  result of such delay or
interruption.  Additionally,  if such  postponement or  interruption  delays the
Buyer's  obligation  to make any of the payments  set forth in Section  entitled
"Purchase Price of the Supplies", paragraph b) hereof, interest will be computed
for each  started  month of delay at an annual  rate one point above the rate of
the "Avance en Compte  Courant Hors Plafond de la Banque  Nationale de Belgique"
as published in "l'Echo" on the first day of such month.

If all the  conditions  necessary  for the  Seller  to sign the Site  Acceptance
Document  referred  to in the  above  Section  have  not been met at the time of
delivery of the Supplies,  the Seller will  nonetheless make its best efforts to
start the  installation  of the Supplies as soon as reasonably  possible and the
Buyer will give the Seller any reasonable  support to allow the Seller to do so.
However,  beginning of installation of the Supplies in the building,  under such
conditions,  will under no circumstances be considered as implicit acceptance of
the Site by the Seller.


8. Acceptance

On the date set by the Seller for the conduct of the  Acceptance  Tests,  and in
the presence of the Buyer's  representatives,  the Seller shall begin to conduct
the agreed-upon Acceptance Tests.

Not more than twenty four (24) hours following the completion of such tests, the
Buyer shall either accept the Supplies as conforming to the requirements of the

<PAGE>   13


Agreement  by  issuing  an  acceptance  certificate   "Acceptance   Certificate"
acknowledging  that  decision,  or advise the Seller in writing of the extent to
which the Supplies do not meet the requirements of the Agreement.

The Buyer shall not withhold the issue of the Acceptance  Certificate on account
of minor omissions or defects in the Supplies which do not substantially  affect
their use but may designate in the Acceptance  Certificate such minors omissions
or defects. The Seller shall promptly make good these omissions or defects.

If the Buyer does not give notice within the period  stipulated above, or begins
using the  Supplies for its own use,  such tests shall be deemed  satisfactorily
completed,  the Acceptance  Certificate  shall be deemed issued on that date and
the related  acceptance  payment shall be paid to the Seller within 15 days from
that date.

If  the  Buyer   gives  the  Seller   notice  that  such  tests  have  not  been
satisfactorily  completed,  the  Seller  shall  make  such  adjustments  as  are
necessary  and  repeat  the   Acceptance   Tests  until  the  Buyer  deems  them
satisfactory pursuant to the terms set out above.

Until  _________________  the Seller shall have unimpeded access to the Supplies
to  complete  the  Acceptance  Tests.  If the  Seller is unable to  successfully
complete the Acceptance Tests by  __________________  the Buyer shall be free to
begin use of the Supplies forty five (45) days later. Should the Supplies be put
into use under this condition, it is understood the Buyer and Seller will make a
good faith effort to facilitate the completion of the Acceptance  Tests,  but it
is further  understood  that the Buyer's  production  of Pd-103 with the machine
takes  precedence.  The Buyer agrees to allow the Seller three (3)  prescheduled
days of unimpeded  access to the  Supplies  per month during the period  between
____________________ until the period for acceptance has expired as specified in
Section 4 "Title and Risk of Loss".

If a dispute  arises  between  the Buyer and the Seller  concerning  whether the
Acceptance Tests have been successfully  completed or concerning the issuance of
the  Acceptance  Certificate,  the Buyer and the Seller  will  jointly  agree to
obtain the services of the American Arbitration Association ("AAA") to arbitrate
the dispute,  as described in Section 29  hereafter.  Both parties will abide by
AAA's recommendations.


<PAGE>   14


If the Seller is prevented  either by the Buyer or by any  regulatory  body that
has juridiction over the Buyer from conducting the Acceptance Tests for a period
of sixty (60) days,  the Buyer  shall be deemed to have  accepted  the  Supplies
sixty  (60) days  after the  Seller  was first  prevented  from  conducting  the
Acceptance  Tests. If the Seller is prevented by force majeure or events similar
to  those  enumerated  under  Section  "Excusable  Delay"  from  conducting  the
Acceptance  Tests, the Buyer shall pay 50% of the Acceptance  payment as defined
in Section 3 b) v). In either  case the Seller  shall  complete  the  Acceptance
Tests within the period remaining at the time the impediment began.


9. Transportation and Insurance

Seller shall at its own expense :

i) Obtain appropriate  property and liability  insurance covering loss or damage
to the Supplies  and  injuries to  individuals  during the  construction  of the
Supplies and during the  transportation  of the Supplies from the Seller's plant
to the Site.

ii) Pay all freight and other transportation charges associated with delivery of
the Supplies to the Site, and have a representative  present during the transfer
of the Supplies from the port of entry to the Site.

iii) Maintain worker's compensation insurance during the assembly,  installation
and testing of the  Supplies,  as  required  by  applicable  law,  covering  its
employees  and,  upon request  from Buyer,  provide a  certificate  of insurance
evidencing such coverage.

Buyer shall at its own expense:

i) Obtain appropriate  property and liability  insurance covering loss or damage
to the Supplies  between  delivery of the Supplies at the Site and the time when
the  Seller  has  been  paid in full  for the  amounts  under  Section  entitled
"Purchase Price of the Supplies". In such insurance policies, both the Buyer and
the Seller shall be named as insured parties.

ii) Arrange for the  destruction,  pick-up  and/or  clearing  away of all waste,
including the Supplies  packaging  except for the disposal of radioactive  waste
which is covered in section 12 of appendix "Building Completion Specifications".


<PAGE>   15


The Buyer and the Seller  shall each take out and  maintain at their own expense
during the period from receipt of the  Supplies at the Site through  Acceptance,
insurance to provide  coverage for both itself and the other party for an amount
of at least one million US dollars  (US$  1,000,000)  per  accident  against any
direct and indirect liability for bodily injury and death to individuals and all
direct or  indirect  costs,  losses  and  damages to the  property  of the other
arising  out of  each  other's  acts  or  omissions  in  unloading,  assembling,
installing and testing of the Supplies.


10. Export Documents, Duties and Foreign Taxes

The Seller will be  responsible  for obtaining all necessary  export  permits or
licences  relating  to the  Supplies  and the Buyer will  offer such  reasonable
assistance  in this regard as the Seller may  request.  The Seller shall pay any
and all export  duties and all other taxes  required  to be paid  outside of the
Buyer's Country in connection with the sale of the Supplies.


11. Customs Duties, Buyer's Country Taxes and Import Permits

The Buyer  shall pay all sales,  use,  gross  receipts,  excise and other  taxes
assessed  or levied by the  Buyer's  Country or any other  taxing  jurisdiction,
state or local,  within the Buyer's  Country,  against the Buyer  (including any
fines, penalties and interests thereof) as a result of or in connection with the
sale, use, delivery, storage or transfer of the Supplies.

The Seller agrees to equally share with the Buyer the cost of the import customs
duties levied by the customs authorities of the USA at the entry of the Supplies
into the USA, up to a maximum  cost for the Seller  equal to two percent (2%) of
the price of the Supplies.

The Buyer shall be responsible  for obtaining all necessary  permits or licences
with respect to the  importation of the Supplies in the Buyer's  Country and the
installation  and use of the Supplies at the Site, and the Seller will offer the
Buyer such reasonable assistance in this regard as the Buyer may request.


12.  Warranty As To Title

The Seller warrants good title to the Supplies.



<PAGE>   16



13. Design and Performance Warranty

The Seller hereby  warrants  that the Supplies  will perform in accordance  with
applicable  design  and  performance   specifications   set  forth  in  Appendix
"Cyclotron Parameters" and in Appendix  "_______ Target Parameters" for a period
of one (1) year after the  Acceptance  Date. The Seller shall resolve any design
flaws appearing during the first year following the Acceptance of the Supplies.


14. Material and Workmanship Warranty

The  Seller  hereby  warrants  that the  Supplies  will be free from  defects in
material  and  workmanship  for a  period  of one  (1)  year  from  the  date of
acceptance of the Supplies by the Buyer or fifteen (15) months from the date the
Supplies are put in their final  location in the Buyer's vault if the Acceptance
Date is delayed at the Buyer's  request or through the Buyer's fault,  whichever
period is shorter: provided,  however, that this warranty shall not apply to ion
source stamped cathodes and chimneys,  puller electrodes,  air filters, targets,
oil for the vacuum  pumps,  demineralizing  column,  gas bottles (H2 for the ion
source, N2 for  venting,...),  and other  consumables;  that the Seller makes no
warranty with respect to failures notified after the warranty period or failures
during operation without logging or failures due to alteration, misapplications,
abuse, abnormal conditions of temperature,  dirt, corrosive matter,  maintenance
not  carried  out  according  to the  Seller's  instructions,  lack  of  trained
personnel for maintenance,  operation above rated capacities either  intentional
or otherwise,  or in an otherwise  improper  manner or physical damage caused by
persons  other than  employees or agents of the Seller;  that the Seller's  sole
liability  under valid  warranty  regarding  claims for defects in material  and
workmanship is limited, at the option of the Seller, to repair or replacement of
the defective parts; that with respect to components purchased by the Seller for
incorporation into the Supplies  essentially  without  modification,  the Seller
makes no  warranties  of its own but  assigns  to the  Buyer  the full  warranty
extended to the Seller as part of the original purchase of the component.

If, due to a fault of the Seller,  the Supplies  have not passed the  Acceptance
Tests by  ______________,  the  Seller's  warranty  shall start and be in effect
until ________________.



<PAGE>   17


The Seller  shall  bear the cost and risk of loss  during  transport  of (i) any
defective  part or components  being  returned to the Seller's  factory with the
Seller's  agreement and (ii) any repaired or replacement  item being returned to
the Buyer.  Products or parts returned without the agreement of the Seller shall
be at the Buyer's  sole risk and expense.  The Seller  shall bear any  personnel
costs incurred in connection  with the  fulfillment of the Seller's  obligations
under this warranty.

The foregoing warranties are exclusive and are given and accepted in lieu of all
other warranties of quality written or oral,  express or implied,  and all other
warranties are hereby disclaimed.


15. Logging of Operations

The Buyer shall keep a logbook of operation  for the  Supplies.  In this logbook
shall be  documented  all  sessions of  operation of the Supplies as well as any
problems  encountered  during  operation of the Supplies.  If the Buyer requests
assistance  from the Seller in  resolving a problem  with the  Supplies  and the
information in the log is relevant to this resolution, the Buyer may at its sole
discretion  make the log available to the Seller . If the Buyer presents a claim
against the  warranty  provided  by the  Seller,  a copy of the log must be made
available to the Seller.  It is  understood  by the Seller that the  information
contained in the Log may be of a proprietary  nature and is therefore covered by
the confidentiality agreement between the parties.


16. Training

The Seller agrees to provide up to two days of training in __________ operation,
preventative  maintenance and repair to the Buyers' personnel at the Site during
or immediately after the installation  period, with the exact dates and times to
be mutually  agreed by the Buyer and Seller.  The cost of such training shall be
the responsibility of the Seller.


17. Disclaimer of Liability for Personal Injury

The Seller and the Buyer hereby acknowledge that the products,  as offered,  are
highly sophisticated devices which should be operated only by trained personnel;
that it is the Buyer's sole obligation to retain and train such personnel or

<PAGE>   18


have it trained,  possibly by the Seller;  that, where  necessary,  the Supplies
contain  interlocking  devices  designed to prevent their  operation in a manner
which  would  cause  injury  to such  personnel,  but as in the  case  with  all
equipment  utilizing  high  voltages,  such  personnel  should  assume  that the
interlocking  devices are  inoperative and should take  appropriate  measures to
ensure that the voltage  has been turned off prior to begin  working  where high
voltage is present during the start up and/or operation of the Supplies; that it
is inherent in the  operation of the  Supplies  that  portions  thereof may emit
dangerous  ionizing  radiation  and may become  activated  during  their  normal
operation;  that it is the Buyer's sole  obligation  to  determine  the level of
radioactivity,  to ensure that a system exists for determining and recording the
levels of  radioactivity  and to ensure that no personnel  or other  persons are
exposed to radiation in excess of that permitted by relevant law or regulations.

Based upon the  foregoing  acknowledgments,  it is,  therefore,  agreed that the
Seller shall not incur any  liability  for personal  injury to any party arising
out of the operations and  maintenance of the Supplies  unless such liability is
solely  caused by a gross  negligence  on the part of the Seller in the  design,
implementation  or  documentation  including but not limited to maintenance  and
operation manuals for the Supplies. In order to give effect to these limitations
of the Seller's liability, and as an express condition of sale, the Buyer hereby
agrees to indemnify and hold the Seller  harmless  from any and all claims,  but
limited by the  exclusion  of  negligent  acts or  omissions  as outlined in the
preceding sentence, damages and liability, including reasonable attorney's fees,
arising  out of a claim  against the Seller for  personal  injuries of any party
occasioned by the operation and/or maintenance of such Supplies.


18. Liability for Consequential Damages

The Seller's  liability to the Buyer for damages howsoever caused shall under no
circumstances  whatsoever  (including  the decision of an  arbitration  panel or
court of law)  exceed  the  payments  actually  received  by the  Seller for the
Supplies  and the Seller shall under no  circumstances  have any  liability  for
special,  incidental,  indirect  or  consequential  damages,  including  without
limitation liability for loss of use, loss of profits, damage or injury to other
property or persons.




<PAGE>   19



19.  Infringement of Proprietary Rights

a) The Seller shall  indemnify  and hold  harmless the Buyer against any and all
losses,  liabilities  and  expenses,  by reason of any third party claim,  suit,
action or proceeding for alleged  infringement  of any  copyright,  trademark or
patent  of the  Buyer's  Country  or  alleged  conversion  of any  trade  secret
resulting from or arising in connection with the manufacture,  installation, use
or sale of the Supplies or any part thereof  including  any and all judgments or
decrees which may be rendered against the Buyer (and reasonable  attorney's fees
if Seller  should  fail to defend as  provided  in  subsection  b)  hereof,  and
settlements  made  arising out of any such  claim,  suit,  action or  proceeding
provided,  however  that this  indemnity  shall not  extend to any  infringement
resulting  from a breach  by the  Buyer  of this  Agreement  or of the  Seller's
instructions for the operation of the Supplies.  The Seller shall however not be
liable for any  infringement  or claim based upon the use of the Supplies or any
portion of the  documentation  in combination with other equipment or technology
not supplied by the Seller or resulting from any modification made by the Buyer,
without approval or instruction by Seller.

b) The Seller shall defend at its own expense all suits,  actions or proceedings
brought  against the Buyer with respect to the matters  listed in  subsection a)
above. The Buyer shall have the right at its option and at its sole expense,  to
participate  in the  defense  of any such  claim,  suit,  action or  proceeding,
without  relieving  the  Seller of any  obligation  hereunder.  The Buyer  shall
promptly  notify the  Seller in writing  after any such claim is made or suit is
brought and shall  cooperate with Seller in the defense  thereof as requested by
the Seller,  and the Seller  agrees to  reimburse  the Buyer for its  reasonable
out-of-pocket  expenses incurred at Seller's specific request in connection with
such  cooperation.  The  Buyer  shall  immediately  notify  the  Seller  of  any
infringement  claim made or  threatened  and shall refrain from any admission of
liability,  and will not  negotiate  or enter into any  settlement  without  the
Seller's prior consent.

c) If,  however,  as a  consequence  of a final  determination  of any  suit for
infringement  or any court decision  involving any injunction  resulting from or
arising in connection  with the  manufacture or sale of the Supplies or any part
thereof furnished or employed by the Seller hereunder,  the Buyer is enjoined or
limited  in any  material  manner in the use of said  Supplies  or part,  Seller
shall,  at its option and at its own expense either i) procure for the Buyer the
right to continue use of said Supplies or part, ii) so modify the Supplies or

<PAGE>   20


part so as to render them  non-infringing  without any significant effect to use
thereof, or iii) replace the Supplies or part with an equivalent  non-infringing
product.


20. Seller's and Buyer's Proprietary Information

Upon completion of the Acceptance  Tests,  the Seller shall furnish to the Buyer
free of charge  information,  manuals  and  drawings  in English and with metric
units of measure  relating  to the  Supplies  and  instructions  to the Buyer in
sufficient  detail to enable the Buyer and its employees to operate,  calibrate,
maintain and repair the Supplies and all parts thereof.  A definitive version of
the documentation,  including the modifications that are specific to the Buyer's
configuration and that are made during the final stages of installation, will be
provided six (6) months after the  completion  of the  Acceptances  Tests.  Such
information,  manuals,  drawings  and  instructions  and the  written  materials
furnished  by the Seller to the Buyer  under the Section  entitled  "Preparatory
Work"  hereof shall remain the property of the Seller and the Buyer shall have a
royalty-free  license  to  use  the  same  in  connection  with  the  operation,
calibration, maintenance and repair of the Supplies. The Buyer shall not use any
of the proprietary information supplied by the Seller for any other purpose than
the operation, calibration, maintenance and repair of the Supplies and the Buyer
shall not register, apply for registration or attempt to acquire any other legal
protection  for the said  proprietary  information in its own name, or any other
name,  or take any  action  which may  affect  the  Seller's  rights,  title and
interest in and to the  technology in any country,  without  obtaining the prior
consent of the Seller.  The Buyer shall treat such  information and materials in
the same  manner  as it  treats  its own  proprietary  information  and will use
similar  means to  protect  it from  unauthorized  disclosure.  The  same  Buyer
covenants and agrees that the contents of such written  information or materials
shall  not be  divulged  to any other  person,  firm or  corporation,  except as
allowed above.

The Seller agrees that all  information  transmitted  from Buyer to Seller under
this contract  including but not limited to,  information  relating to research,
development, manufacturing, testing, accounting and marketing will be considered
confidential  information.   This  confidential  information  will  be  held  in
confidence and not disclosed to third parties by the Seller.  This  confidential
information  shall be held in  confidence by the Seller using the same degree of
care as the Seller uses in  protecting  its own  confidential  information.  The
Seller shall only use such  confidential  information for the purpose of meeting
its obligations under this Agreement.




<PAGE>   21



21. Destruction of Supplies

In the event that prior to the delivery of the Supplies,  the Supplies are lost,
destroyed  or  damaged  to such an extent  that  they  cannot  be  repaired  and
delivered  in  accordance  with the  delivery  schedule set forth in the Section
entitled "Installation of Supplies",  provided the event is not a willful act of
the Seller, the time reasonably  required by the Seller to furnish a replacement
for the  Supplies or to  accomplish  such  repairs  shall be deemed an Excusable
Delay under the Section entitled  "Excusable  Delay" and the Seller shall not be
deemed to be in default or to have breached its duties hereunder.



22. Excusable Delay

Notwithstanding anything to the contrary herein contained, if the performance of
this  Agreement  by any  party  or the  obligation  of any  party  hereunder  is
prevented,  restricted  or  interfered  with by reason of : i) fire,  explosion,
strike,  lockout,  labor  dispute,  casualty  or  accident,  epidemic,  cyclone,
drought,  flood or ii) war,  revolution,  riot, civil commotion,  acts of public
enemies,  blockage  or  embargo,  or iii) any law or  proclamation,  regulation,
ordinance, demand or requirement of any applicable government or any subdivision
thereof  or  representative  of any  such  government,  or iv)  any  other  acts
whatsoever,  whether  similar  or  dissimilar  to those  enumerated,  beyond the
reasonable  control of a party  hereto,  then,  and in that event,  the party so
affected  shall  promptly  notify the other  party of all  reasonable  resulting
difficulties.  Upon such notice,  the disabled party shall,  for the duration of
its disability (referred to as "Excusable Delay" in this Agreement),  be excused
from the performance of such of its obligations as are prevented, restricted, or
interfered  with  by  reason  of the  occurrence  of any  of  the  events  above
enumerated  and such  party  shall  not be deemed to be in  default  under  this
Agreement  nor be subject to any  liability  or damage.  The time period  during
which any party is to perform  under this  Agreement  shall be  extended  by the
period of any Excusable Delay. Excusable Delay under the same terms occurring in
respect to the Seller's  sub-contractors  shall be deemed to be Excusable  Delay
occurring to the Seller.

If the Seller is prevented from proceeding according to any of the schedules set
out in this Agreement by the Buyer's fault, by a delay on the part of the Buyer,

<PAGE>   22


or by a regulatory body with jurisdiction over the Buyer's site, or if the Buyer
delays a payment or the issuance of a Letter of Credit  pursuant to Section 3 by
more than fifteen (15) days past the due date,  then all the dates  contained in
this  Agreement  for  completion  by the Seller of its  obligations  and rights,
including but not limited to the right to exercise the accelerated  delivery and
acceptance  option,  shall be  postponed  by an  additional  period equal to the
delay.


23. Termination for Insolvency

In the event that either the Buyer or the Seller :

a) makes a general assignment for the benefit of creditors or becomes insolvent;

b) files an insolvency petition in bankruptcy;

c) petitions for or acquiesces in the  appointment  of any receiver,  trustee or
similar officer to liquidate or conserve its business or any substantial part of
its assets ;

d) commences,  under the laws of any jurisdiction,  any proceeding involving its
insolvency,  bankruptcy,   reorganization,   adjustment  of  debt,  dissolution,
liquidation  or any other  similar  proceeding  for the  release of  financially
distressed debtors ; or

e) becomes a party to any proceeding or action of the type described above in c)
or d) and such proceeding or action remains undismissed or unstayed for a period
of more than sixty (60) days,


then the other party may, by written notice, terminate this Agreement.


24. Spare Parts

The Seller agrees to make available to the Buyer,  as the Buyer may from time to
time require, ____________________,  spare parts and components to the Supplies,
and the Seller agrees to exert  reasonable  efforts to meet the Buyer's delivery
requirements  for said parts and  components  or acceptable  substitutes.  It is
understood  that the  parties  shall  negotiate  in good  faith  reasonable  and
mutually agreeable prices for said spare parts and components.




<PAGE>   23



25. Technical Assistance by the Seller

Immediately  following the  successful  completion of the  Acceptance  Tests the
Seller  shall send one of its  specialists  to assist the Buyer in bringing  the
cyclotron to full  operational  capacity.  The  specialist  shall be the project
coordinator  or, if he is not  available,  someone of equal or better  technical
expertise,  this other person to be approved by the Buyer,  such approval not to
be unreasonably  withheld. The Seller's specialist will remain at the site for a
period of 28 days unless the Buyer  agrees that the  services of the  specialist
are no longer required.  During this period,  the Buyer's specialist will define
the tasks to be  performed  by the  Seller's  specialist  with the  objective of
verifying  the  cyclotron  1) is fully  operational,  2) performs  according  to
specifications  within the production  environment and 3) its automated  control
system performs according to specifications. This period of technical assistance
does not relieve the Seller of any of its warranty  obligations,  including  the
requirement  that the Seller  send any  personnel  required  to the Site to make
repairs  should the  Supplies  be found to not meet  specifications  during this
period.


26. Entire Agreement

This Agreement,  made in two originals,  one for each party, contains the entire
agreement  between the parties and shall  supersede all previous  communications
and  agreements,  whether oral or written,  with  respect to the subject  matter
hereof and the provisions  hereof may not be modified or superseded except by an
instrument in writing signed by a duly authorized  officer or  representative of
each of the parties hereto.


27. Authorization

By virtue of having  affixed  their  respective  signatures  below,  each of the
parties  hereto  warrants  that it has obtained all  authorization  necessary to
enter into and perform its obligations under this Agreement.


28. Effective Date

This Agreement  shall become  effective as of the date upon which payment i), as
set forth in Section entitled  "Purchase Price of the Supplies",  is received by
the Seller.




<PAGE>   24



29. Disputes

With respect to any  controversy  arising out of or relating to this  Agreement,
such controversy shall be settled by final and binding  arbitration in New York,
NY,  USA,  in  accordance  with the  then-existing  rules (the  "Rules")  of the
American Arbitration Association ("AAA") and judgment upon the award rendered by
the  arbitrators  may be  entered  in any  court  having  jurisdiction  thereof;
provided,  however,  that the law applicable to any  controversy  and the law by
which this  Agreement  shall be construed  and governed  shall be the law of the
State  of New  York,  regardless  of its or  any  jurisdiction's  choice  of law
principles.  In any  arbitration,  pursuant  to this  Agreement,  the  award  or
decision  shall  be  rendered  by a  majority  of  the  members  of a  Board  of
Arbitration  consisting of three (3) members,  one of whom shall be appointed by
each  party  and the  third of whom  shall be the  Chairman  of the panel and be
appointed by mutual agreement of said two  party-appointed  arbitrators.  In the
event of failure of said two  arbitrators  to agree upon the  appointment of the
third  arbitrator   within  sixty  (60)  days  after  the  commencement  of  the
arbitration  proceeding,  the third  arbitrator shall be appointed by the AAA in
accordance  with the Rules. In the event that either party shall fail to appoint
an arbitrator  within thirty (30) days after the commencement of the arbitration
proceeding,  such arbitrator and the third  arbitrator shall be appointed by the
AAA in  accordance  with the  Rules.  The  Rules of  Evidence  and the  Right to
Discovery shall be applicable to both parties.

Work under this Agreement shall continue during the arbitration  proceedings and
payments due to the Seller shall not be withheld on account of such  proceedings
unless such  particular work or payment is the subject matter of the arbitration
in which case this provision shall not apply to such particular work or payment.

The parties agree to equally share the expenses associated with this arbitration
procedure.


30. Governing Laws

This Agreement  shall be governed by and construed in all respects in accordance
with the laws of the State of New York, USA.




<PAGE>   25



31. Notices

a) Any notice  given under this  Agreement  shall be made in  writing,  shall be
given by first class air mail,  telex,  telecopier or commercial cable and shall
be addressed to :

In the case of the Seller:
      Ion Beam Applications
      Chemin du Cyclotron, 3
      1348 Louvain-la-Neuve
      Belgium
      Attn : Mr. Yves Jongen
      Fax Number : 32-10-47.58.10

In the case of the Buyer :
      Theragenics Corporation
      5325, Oakbrook Parkway
      Norcross, GA 30093
      USA
      Attn : Mr. Glenn Dill
      Fax Number : 1 (404) 381 84 47

Either party,  by written  notice to the other,  may change the address to which
notices will be directed.

b) Any notice shall be deemed given on the date personally  delivered or sent by
telex,  telecopier or cable and fifteen (15) days after the date of mailing,  if
mailed.


32. Project Coordinator

Upon signing this Agreement,  both parties shall designate a representative  who
will act as Project  Coordinator  and official  addressee for all  communication
resulting from this  Agreement,  other than any official  notice given under the
Section  entitled   "Notices".   All  requests  for  service,   transmittals  of
information,  reports on training  activity,  and other  communication  required
under this  agreement  shall be sent by and directed to the  respective  Project
Coordinators. Informal conversations occurring person-to-person or by phone,

<PAGE>   26


requests and  information  shall be validated by an appropriate  written form as
confirmation.  Any communication sent to others than those designated as Project
Coordinators,  or in a  manner  not in  accordance  with the  Notices  procedure
specified in this Agreement will be considered as informal and non-existent.


33. Assignment

This  Agreement  shall inure to the  benefit of and be binding  upon each of the
parties hereto and their  respective  successors and assignees,  but neither the
rights nor the duties of either party hereunder may be assigned,  in whole or in
part by either party, without the prior written consent of the other party. Such
consent shall not be unreasonably withheld by either party. Any assignment shall
not relieve the assignee of any of the Agreement obligations of the assignor.


34. Headings

The headings  contained  within this  Agreement are  established  solely for the
convenience  of the  two  parties  and  are not  intended  to and do not  limit,
construe or modify any of the terms and conditions included hereof.


35. Severability

If  any  term  or  provision  of  this  Agreement  is  held  to  be  illegal  or
unenforceable, then this Agreement, except for such part or parts thereof, shall
continue to be in full force and effect.

In the event of any  inconsistency  between a provision of the conditions of the
Agreement and the content of an Appendix to this  Agreement,  and if the parties
cannot  agree on the  clause to take  precedence,  the AAA of Section 29 will be
asked to  mediate/arbitrate  the dispute  and the parties  agree to abide by the
finding of said association.



36.  Non-Waiver

The failure by either party to enforce at any time or for any period of time any
of the  provisions  hereof shall not be a waiver of such  provisions  nor of the
right of such party thereafter to enforce each and every such provision.


<PAGE>   27


IN WITNESS  WHEREOF,  the parties  have caused this  Agreement to be executed in
duplicate by their duly qualified officers or representatives.

THERAGENICS CORPORATION Inc.

Not Required
Christine Jacobs
President

/s/ Bruce Smith                                      /s/ Glenn Dill
Bruce Smith                                          Glenn Dill
Chief Financial Officer                              Director of Operations

ION BEAM APPLICATIONS, S.A.

/s/ Yves Jongen                                      /s/ Sabine de Voghel
Yves Jongen                                          Sabine de Voghel
President                                            Area Sales Manager




<PAGE>   28
                                    APPENDIX
                                                                    
                            CYCLOTRON PARAMETERS                       
                                                             
                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission                               


                                                         METHOD OF VERIFICATION
 BEAM                                                   FOR THE ACCEPTANCE TESTS
                                                             not required
                                                             calculated
                                                             measured
                                                             rationale
                                                             calculated
 POWER CONSUMPTION                                         
                                                             measured
                                                             measured
 MAGNETIC STRUCTURE                                        
                                                             value provided
                                                             value provided
                                                             value provided
                                                             value provided
                                                             value provided
                                                             value provided
                                                             value provided





Theragenics/IBA Contract - Cyclotron #8 - _____________ - p.1

<PAGE>   29

The Seller agrees that if the Buyer develops at its own expense a
______________ to ___________, and if the device does not interfere or
compromise the functioning of this _______, the Seller will cooperate with the
Buyer to integrate this __________ into its design _________.


 R.F. SYSTEM
                                                                 value provided
                                                                 value provided
                                                                 value provided
                                                                 value provided
                                                                 value provided
                                                                 value provided
                                                                 value provided
                                                                 value provided
                                                                 value provided
 ION SOURCE                                                     
                                                                 verified
                                                                 value provided
 The Seller agrees to provide _______________________.





Theragenics/IBA Contract - Cyclotron #8 - _____________ - p.2

<PAGE>   30

 GENERAL DIMENSIONS
                                                                  value provided
                                                                  value provided
                                                                  value provided
                                                                  value provided
 WEIGHT                                                             
                                                                  value provided
 VACUUM SYSTEM
 The Buyer will make its best effort to have _____ whenever possible.

 CONTROL SYSTEM


 STRAY BEAM CONTROL


 WATER MANIFOLD
         The water manifold will be __________________________.





Theragenics/IBA Contract - Cyclotron #8 - _____________ - p.3
<PAGE>   31

                                    APPENDIX

                           ________ TARGET PARAMETERS


                                                         METHOD OF VERIFICATION
 TESTS                                                      FOR THE ACCEPTANCE
                                                               calculated 
                                                               measured   
                                                               measured   
                                                               calculated 
                                                               specified  
                                                               specified  
                                                               measured*  


Notes:
         1)      It is understood the Seller will make its best effort to
                 ____________.

         2)      The Buyer understands the ___________ to be delivered is to
                 function at ____________.  The Seller will however consider
                 the possibility of ______________ and if this can be done 
                 _______________, will _________________.

* to be measured after completion of the Acceptance Tests





Theragenics/IBA Contract - Cyclotron #8 - _____________ - p.4
<PAGE>   32

                                    APPENDIX

                             BUILDING REQUIREMENTS

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission

 A.       RECOMMENDED ROOM CONFIGURATION


 1.       CYCLOTRON VAULT

 Inside dimensions:

 Recommended vault shielding:

 Floor loading:
 Floor drains:                   As required by local code & subject to health 
                                 safety rules

 Temperature limits:

 Humidity limits:
 Power dissipated in the air:

 Lifting eyebolts and anchoring points shall be installed in the vault
 according to IBA specifications, if required.


 2.       POWER SUPPLY AND CONTROL ROOM

 Inside dimensions:
 Temperature limits:

 Humidity limits:

 Power dissipated in the air:
 The door height for the insertion of the Supplies shall be more than 5 cm
 higher than that of the Supplies.

 Power supply, control and cyclotron rooms will be located close to each other
 to avoid long cables and shall not be more than 30 meters away from each
 other.


 3.       CYCLOTRON COOLING SYSTEM REQUIREMENTS

 The cooling system should be located as close to the cyclotron vault as
 possible, with access to a water supply.

A ___________ is sufficient to accommodate the heat exchanger, column and pump.





Theragenics/IBA Contract - Cyclotron #8 - _____________ - p.5
<PAGE>   33

 Locating the cooling system on a different level from the cyclotron's is
 possible to a maximum height difference of __________ the cyclotron median
 plane _____________.

 The area should be easily accessible for servicing the equipment.


 B.       SERVICES SPECIFICATIONS

 1.       ELECTRICAL POWER

 _________, other voltages possible if specified within two weeks of the time
 of order.  
 ______________.

 ______________.

 Voltage to be nominal ____________.
 
 Delivered to IBA's power distribution cabinet in the power supply room.

 The Buyer shall provide, install and terminate the power cables to the "mains"
 connection (AC power input) of all IBA power distribution cabinets in
 accordance with local electrical code requirements.


 2.       COOLING, SECONDARY LOOP

 Water requirements (chiller loop):

 Flow:

 Temperature:

 Power to be removed:

 D P:

 ____________ water has to be delivered in the cooling room ___________.
 Drains according to local building codes should be included.


 3.       COMPRESSED AIR

 Pressure:

 Quality:

 Average flow:

 Peak flow:

 Outlets must be provided.





Theragenics/IBA Contract - Cyclotron #8 - _____________ - p.6
<PAGE>   34

 4.       ____________ FOR CYCLOTRON VENTING

 Pressure:

 Quantity:


 5.       _____________ FOR THE ION SOURCE

 Pressure:

 Quantity:

 Quality:





Theragenics/IBA Contract - Cyclotron #8 - _____________ - p.7
<PAGE>   35

                                    APPENDIX

                       BUILDING COMPLETION SPECIFICATIONS

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission


The building shall be fully completed and shall have been accepted by the
Seller prior to the arrival of both the Seller's team and the equipment
necessary for the installation of the Supplies.  The Seller will start
installation work when the following conditions have been complied with to
Seller's reasonable satisfaction.

A "Site Acceptance Document" will be provided by the Seller to the Buyer and
will list the mutually agreed progress of the site reaching specification.

1.       CONCRETE

All concrete must cure for at least ________ prior to arrival of the Supplies
and related equipment in order to avoid _______________ problems.


2.       PIPES AND CABLES

All conduits, cable trenches, raceways, cable trays and related equipment shall
be installed by the Buyer prior to equipment arrival.  Cables and pipes shall
be relayed to the various working areas by way of a _________ having a
____________, built in accordance with relevant electrical standards.  The
trench shall be equipped with cable ladders and/or cable ducts and be covered
(planks or galvanized roofing...).

The Seller shall provide detailed plans and recommendations regarding location,
size and number of trenches/pipes and cable trays that are required.

Cables and pipes for the ____________ shall be laid in different cable trays or
conduits from the cable trays or conduits housing the ___________.
_____________ are to be separately routed.

The Seller recommends that the trench be provided with ___________________.

______________ are needed for power cables, control cables, cyclotron system
water cooling pipes, vacuum system water cooling pipes, compressed air pipes,
gas pipes and ________________.

It is the Buyer's responsibility to ensure that the cable routing system meets
local electrical codes and requirements.





Theragenics/IBA Contract - Cyclotron #8 - _____________ - p.8
<PAGE>   36

3.       SERVICES

All services, as described in Appendix "Building Requirements", shall be
installed and made ready to be put into operation, before installation
commences.


4.       SECONDARY WATER COOLING CONNECTIONS

All piping from the Buyer's water cooling system must be installed.  Piping,
routed to locations suggested by the Seller, should have _______________ prior
to equipment installation.  A water make-up line should be provided.


5.       DUST

All floors, ceilings and walls including the inside of the trenches and other
openings shall be given a surface that minimizes dust generation.  It is
recommended that all surfaces be painted in a light color to improve visibility
and to promote safety.  All painting, sanding, placement of doors and windows
or similar will be completed.


6.       LIGHTING AND ELECTRICAL EQUIPMENT POWER

Suitable and sufficient lighting shall be provided in all work areas.  Standard
recommendations are as follows:

                -Vault
                -Power supply room
                -Control room

Emergency lighting should be available in all relevant areas.

Single phase outlets shall be located at intervals of 3 meters or less in each
room where Seller's equipment will be installed.


7.       COMPRESSED AIR OUTLETS

Exact location for the compressed air outlet will be specified for the
particular application by the Seller to the Buyer in due time.





Theragenics/IBA Contract - Cyclotron #8 - _____________ - p.9
<PAGE>   37

8.       POWER SUPPLY AND CONTROL ROOM FLOORING

This room requires a raised or "computer type" flooring.


9.       VENTILATION

The control and power supply rooms will be air-conditioned to ensure optimal
operation of the electronic equipment.  The other areas will be ventilated and
heated when necessary.  Ventilation conditions and other conditions, shall be
organized according to the current regulations in the Buyer's country.  The
relative humidity level will not exceed ____% in all relevant areas.  The
passageways of ventilation ducts in the walls shall comply with the
________________.


10.      HEATING

A temperature at ________ will be maintained in all relevant areas during the
installation and testing of the equipment.


11.      RADIATION PROTECTION

While the Seller can offer building design suggestions, the entire
responsibilities for meeting all local codes and regulations regarding
radiation protection remain with the Buyer.  The building and all work areas
will comply with all relevant safety standards concerning radiation protection
during all phases of construction, installation, testing and operation.  The
Buyer will be responsible for installation plans of a radiation protection
system in accordance with local codes and regulations.


12.      INFRASTRUCTURE & SERVICES

The Seller requires sufficient office space, tool storage, locker, furniture
and shower facilities for its personnel during the period of installation and
testing.  Construction site access must also meet the approval of the Seller's
engineer.

The Buyer must, at his own expense arrange for the destruction, pick-up and/or
clearing away of all waste, including Seller's Supplies packaging except
radioactive waste which will be handled as follows.  The Buyer agrees to
provide an uncontaminated area directly in front of the cyclotron vault that
can be used for unpacking components of the Supplies during assembly with the
understanding that all packing materials and other waste must be removed from
this area before the start of beam tests at which time the area in front of the
vault will be incorporated into the contaminated Hot Maintenance Area.  The
Buyer will also provide appropriate disposable protective clothing and gear for
Seller's personnel during installation and testing and will at its own expense
dispose of all such protective clothing and gear.  The Buyer will also at its
own expense dispose of one 55 gallon drum of solid radioactive waste produced
by Seller's personnel during installation.  For any additional





Theragenics/IBA Contract - Cyclotron #8 - _____________ - p.10
<PAGE>   38

radioactive waste produced by Seller's personnel during the installation
process, the Buyer and Seller agree to equally share the cost of disposal up to
a maximum of ____________ paid by the Seller.

Besides the maintenance of the building site, providing security and fire
protection is also the Buyer's responsibility.


13.      COMMUNICATION AND SURVEILLANCE EQUIPMENT

An intercom system shall interlink the ______________.  It would be useful to
be able to communicate from the ____________.  It is suggested that a
________________ be used in the ___________ for personnel safety.


14.      INSERTION OF THE SUPPLIES

a)       An appropriate opening through the wall shall be made in the cyclotron
         vault to allow for passage of the cyclotron.  This opening shall be
         closed by the Buyer as soon as the cyclotron will have been rigged
         into the cyclotron vault as closing of the opening is necessary for
         progressing with the installation of the Supplies.  The inside surface
         of the vault closing will be finished within 5 days after the
         cyclotron has been place in its final location.

b)       A maneuvering area for a heavy trailer ______________ unloading and a
         covered area ____________ for the assembly of the major components of
         the Supplies must be provided for in front of the opening outside the
         vault with adequate access to nearby roads.

         The covered area shall be such as to be able to serve as storage area
         for the rest of the Supplies while the cyclotron is rigged and the
         opening in the vault is closed.  Its floor shall support the use of a
         three-ton forklift truck.

         The ground of the cyclotron vault and of the unloading area shall be
         surfaced with reinforced concrete capable of withstanding the
         necessary maneuvering of the cyclotron into position.

c)       All doors, corridors and other passageways leading to the control room
         or any other room where Seller's equipment will be installed shall be
         cleared so as to allow transportation of the Seller's equipment by
         mean of a three-ton forklift truck or a similar transportation vehicle
         from the unloading area to the place of final installation of the said
         equipment.

d)       For unloading and installation of additional equipment delivered to
         the Site during the installation period, the Buyer shall prepare
         building access and surroundings in order to allow access and
         unloading of 10-ton trucks (unloading platform if possible).  It must
         be possible to perform the trucks unloading and the introduction of
         the additional equipment in the building with a hand-lift.  The
         possibility to use the Buyer's fork-lift if needed would be
         appreciated.





Theragenics/IBA Contract - Cyclotron #8 - _____________ - p.11
<PAGE>   39

15.      CONSULTING SERVICES

Typically, prior to the issuance of a purchase order or execution of some other
form of purchase agreement, the Seller will have prepared a preliminary layout
of the Buyer's facility and furnished various data regarding required building
services.  After the purchase agreement has become effective, the Seller,
without additional charge, will make a final layout and prepare such other
plans and memoranda necessary to transmit data to the Buyer's architects and
engineers.  Similarly, the Seller, without additional charge, will review the
initial set of architectural and engineering drawings and minor revisions
thereof.  However, the time devoted to preparation by the Seller's personnel of
additional layouts or drawings and/or reviews of revised sets of architectural
and engineering drawings will be invoiced at the Seller's regular rates.  No
additional charge will be made for telephone consultations.  Travel and related
expenses incurred as a result of attendance by the Seller personnel required at
meetings outside of Belgium with the Buyer's architects, engineers, consultants
and/or representatives will be reimbursed by the Buyer.  With respect to the
foregoing, the responsibility for determining whether conflict exists between
local building codes and/or other laws or government regulations and the
content of drawings, data sheets, memoranda or other forms of communication
submitted by the Seller is solely the responsibility of the Buyer, his
architects, engineers and/or consultants.





Theragenics/IBA Contract - Cyclotron #8 - _____________ - p.12
<PAGE>   40

                                    APPENDIX

                              INCLUDED SPARE PARTS

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission




The following spare parts are included in the total purchase price of the
Supplies:



         -other miscellaneous spares for a value of __________, to be specified
          by the Buyer.





Theragenics/IBA Contract - Cyclotron #8 - _____________ - p.13
<PAGE>   41

                                    APPENDIX

                              ACCEPTANCE CRITERIA

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission


The Buyer is prepared to purchase the Supplies because the Seller has
represented that they will possess certain characteristics which make them
useful and of value to the Buyer.  The following Acceptance Criteria embody the
Buyer's understanding of these characteristics and therefore the Buyer's
willingness to purchase the Supplies is predicated upon the Supplies actually
having these characteristics.  The Acceptance Tests which follow are intended
to establish whether or not the Supplies are likely to possess these
characteristics and consequently determine if the Buyer should pay the full
agreed price for the Supplies.

Acceptance of the Supplies by the Buyer requires that they meet the following
minimum criteria as demonstrated by the Acceptance Tests:

1.       The Supplies must conform with the parameters set out in the Appendix.
"Cyclotron Parameters" and the Appendix "______________ Target Parameters."

2.       All of the items making up the Supplies must function together in a
way which provides reliable, continuous operation with _________________.  This
performance must be sustainable over a routine production schedule defined as
_______________.  Furthermore, the ___________________.

3.       The target system must be designed so that it efficiently utilizes the
protons impinging the target.  The rate of Pd-103 production in the rhodium
target must meet or exceed __________.  If the rate of production is determined
during the Acceptance Test to be _____________ of the above production rate,
the Seller may correct the deficiency by _____________, i.e., the guaranteed
intensity as referred to in Appendix "Cyclotron Parameters".

4.       Void.

5.       Routine operation as defined in Item 2 above must not lead to
structural damage to internal components of the cyclotron or the target
assembly due to interactions between the beam and such components.

6.       The radiation level within the cyclotron must not increase as a result
of proton and neutron activation and target evaporation to a level which makes
it unsafe to maintain and service the internal components.

7.       The target handling device shall reliably remove the ______________
target from the cyclotron and place it into a shielded container for manual
transfer to the target processing laboratory.  The operation of the target
handling device shall be _______________________.  A written procedure,
providing adequate radiation protection, shall be prepared in case it is
necessary to _________________.  The rhodium surface and all other surfaces of
the target handling system





Theragenics/IBA Contract - Cyclotron #8 - _____________ - p.14
<PAGE>   42

shall be shielded so an operator can safely enter the cyclotron vault to
transfer the shielded target out for processing.





Theragenics/IBA Contract - Cyclotron #8 - _____________ - p.15
<PAGE>   43

                                    APPENDIX

                                ACCEPTANCE TESTS

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission


The following tests were developed based on experience gained through the
operation of the first three IBA __________ cyclotrons.  They provide a
reasonable test of the functionality of the Supplies and when combined with the
Technical Assistance provided by the Seller as called for in Section 25 of the
Contract, should provide the Buyer a fully functional cyclotron properly
integrated into Buyer's production environment.

All radiation monitoring and measuring equipment used in these tests will be
provided by the Buyer.  All targets and the _________ are the Buyer's
responsibility and at its own expense.

Test 1.  The Supplies shall be demonstrated to comply with the specifications
set out in the Appendix "Cyclotron Parameters" and the Appendix "___________
Target Parameters" by the means specified in the Appendices.

Test 2.  When the Supplies have been declared fully operational by the Seller,
the target handling device shall be cycled through a complete transfer from
demounting a fully installed target as it would be installed for a production
run through placing the target into a shielded container and the container
closed.  This portion of this test shall be deemed passed when ___________ have
been completed.  The target shall be transferred from the cyclotron to the
shielded container 5 times following the routine procedure for
__________________.

Test 3.  When the Supplies are fully installed and Tests 1 and 2 have been
successfully completed, the Supplies must operate for ____________________.
The target must then be removed and inspected in the hot cell to determine that
the beam strike was on target, _________________.  When the Buyer concurs in
writing, such concurrence not to be unreasonably withheld, that the Supplies
performed according to the specifications, the Supplies will be deemed to have
been accepted and Seller become eligible for the Acceptance Payment.





Theragenics/IBA Contract - Cyclotron #8 - _____________ - p.16
<PAGE>   44

                                   APPENDIX

                  ACCELERATED DELIVERY AND ACCEPTANCE OPTION

                     Confidential portions of this Appendix
                     have been omitted and filed separately
                              with the Commission


The Buyer has the option to request to the Seller, at any time during this
Agreement, to work on an accelerated schedule basis in order to have the
Supplies accepted at an earlier date than the scheduled acceptance date of
__________________.  Official request must be made in writing and addressed to
Yves Jongen, President of IBA.

In the case the Buyer exercises this option, the Buyer will pay the Seller an
additional sum of ___________ for each complete day between the actual date of
early acceptance and ______________, including the day of
_______________________.





Theragenics/IBA Contract - Cyclotron #8 - _____________ - p.17


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