NORTH AMERICAN SCIENTIFIC INC
10QSB, 1997-09-15
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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<PAGE>




                  SECURITIES AND EXCHANGE COMMISSION
                        WASHINGTON, D.C. 20549

                              FORM 10-QSB
(Mark One)

         /x/  Quarterly Report Pursuant to Section 13 or 15(d) of the Securities
              Exchange Act of 1934

                  For the quarterly period ended July 31, 1997

                                  or

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


                    Commission file number  0-26670

                    NORTH AMERICAN SCIENTIFIC, INC.
         (Name of small business as specified in its charter)

         Delaware                                     51-0366422
(State or other jurisdiction of            (I.R.S. Employer Identification No.)
incorporation or organization)


    7435 Greenbush Avenue
    North Hollywood, CA                                  91605    
(Address of principal executive offices)               (Zip Code) 



            Issuer's telephone number, including area code:
                            (818) 503-9201



    Check whether the issuer (1) filed all reports required to be filed by
Section 13 or 15(d) of the Exchange Act during the past 12 months (or for such
shorter period that the registrant was required to file such reports), and
(2) has been subject to such filing requirements for the past 90 days. 
Yes  X   No
    ---     ---

    At September 10, 1997,  there were 3,350,201 shares of the registrant's
common stock outstanding.


<PAGE>

                    NORTH AMERICAN SCIENTIFIC, INC.

                   THIRD QUARTER ENDED JULY 31, 1997




DESCRIPTION                                                                 PAGE
- -----------                                                                 ----

PART I   FINANCIAL INFORMATION


         Item 1.   Consolidated Financial Statements

                   CONSOLIDATED BALANCE SHEET                                1
                     July 31, 1997 and October 31, 1996

                   CONSOLIDATED STATEMENT OF OPERATIONS                      2
                     Nine months and Three months ended July 31, 1997
                     and July 31, 1996

                   CONSOLIDATED STATEMENTS OF CASH FLOWS                     3
                     Nine months ended July 31, 1997 and July 31, 1996

                   NOTES TO FINANCIAL STATEMENTS                             4

          Item 2.  Management's Discussion and Analysis of Financial         5
                   Condition and Results of Operations


PART II    OTHER INFORMATION                                                 6


<PAGE>

                    NORTH AMERICAN SCIENTIFIC, INC.

                      CONSOLIDATED BALANCE SHEET


                                ASSETS


                                                       October 31,  July 31,
                                                          1996        1997
                                                          ----        ----
                                                                   (unaudited)

Current assets:
    Cash and cash equivalents                        $   866,000   $ 1,887,000
    Investments                                           26,200        26,900
    Accounts receivable, less allowance for doubtful
     accounts of $0 and $4,500, respectively             683,200       467,700
    Inventories                                          144,800       380,300
    Prepaid expenses and other current assets             22,500        75,000
                                                     -----------   -----------

        Total current assets                           1,742,700     2,836,500

Equipment and leasehold improvements, net                215,900       329,900
Deposits and other assets                                 41,600        54,300
                                                     -----------   -----------

                                                     $ 2,000,200   $ 3,221,100
                                                     -----------   -----------
                                                     -----------   -----------


                 LIABILITIES AND STOCKHOLDER'S EQUITY

Current liabilities:
    Accounts payable                                 $   272,600   $   319,500
    Accrued expenses                                      43,800        40,900
    Income taxes payable                                 155,400             -
                                                     -----------   -----------

        Total current liabilities                        471,800       360,400


Stockholder's equity:
    Preferred stock, par value $.01 per share;
     authorized 2,000,000 shares, no shares issued             -             -
    Common stock, par value $.01 per share; authorized
     10,000,000 shares; 1997 - 3,323,301 shares issued
     and outstanding, 1996 - 2,983,201 shares issued
     and outstanding                                      29,800        33,200
    Additional paid-in capital                         2,105,100     3,220,000
    Accumulated deficit                                 (597,100)     (376,900)
    Cumulative translation adjustment                     (9,400)      (15,600)
                                                     -----------   -----------

        Total stockholder's equity                     1,528,400     2,860,700
                                                     -----------   -----------

                                                     $ 2,000,200   $ 3,221,100
                                                     -----------   -----------
                                                     -----------   -----------


     See accompanying notes to consolidated financial statements.


                                   1
<PAGE>

                    NORTH AMERICAN SCIENTIFIC, INC.

                 CONSOLIDATED STATEMENT OF OPERATIONS
                              (unaudited)


<TABLE>
<CAPTION>

                                                 Nine Months Ended            Three Months Ended
                                                      JULY 31,                     July 31,
                                                -------------------           -------------------
                                                1997           1996           1997           1996
                                                ----           ----           ----           ----

<S>                                         <C>            <C>            <C>            <C>
Net sales                                   $2,589,500     $2,030,600     $  820,400     $  836,300
Cost of goods sold                           1,367,100      1,024,500        449,100        417,700
                                            ----------     ----------     ----------     ----------

      Gross profit                           1,222,400      1,006,100        371,300        418,600

Research and development expenses               28,400          9,500         13,400            600
General and administrative expenses            851,300        574,200        296,300        218,800
                                            ----------     ----------     ----------     ----------

      Income from operations                   342,700        422,400         61,600       199,200


Interest and other income                       32,000         15,400         16,200          4,800
                                            ----------     ----------     ----------     ----------

    Income from continuing operations
     before income taxes                       374,700        437,800         77,800        204,000


Income taxes                                   154,500        176,300         36,600         88,200
                                            ----------     ----------     ----------     ----------

    Net income for period                   $  220,200     $  261,500     $   41,200     $  115,800
                                            ----------     ----------     ----------     ----------
                                            ----------     ----------     ----------     ----------

Earnings per share:

    Net earnings per share                  $      .07     $      .09     $      .01     $      .04
                                            ----------     ----------     ----------     ----------
                                            ----------     ----------     ----------     ----------

Weighted average number of shares
outstanding                                  3,078,757      2,983,201      3,194,868      2,983,201
                                            ----------     ----------     ----------     ----------
                                            ----------     ----------     ----------     ----------

</TABLE>

     See accompanying notes to consolidated financial statements.

                                   2
<PAGE>

                    NORTH AMERICAN SCIENTIFIC, INC.

                 CONSOLIDATED STATEMENT OF CASH FLOWS
                              (unaudited)

                                                               Nine Months
                                                              Ended July 31,
                                                            -----------------
                                                            1997         1996
                                                            ----         ----

Cash flows from operating activities:
  Net income                                          $  220,200   $  261,500
  Adjustments to reconcile net income to
    net cash used in operating activities:
      Depreciation and amortization                       38,900       35,100
      Changes in assets and liabilities:
       Accounts receivable                               215,500      (95,500)
       Inventories                                      (235,500)     (26,600)
       Prepaid expenses and other current assets         (52,500)     (12,200)
       Deposits and other assets                         (12,700)      (1,900)
       Accounts payable                                   46,900      116,900
       Accrued expenses                                   (2,900)      (9,000)
       Income taxes payable                             (155,400)      50,200
                                                      ----------   ----------

       Total adjustments                                (157,700)      57,000
                                                      ----------   ----------

  Net cash provided by operating activities               62,500      318,500


Cash flows from investing activities:
  Purchase of fixed assets                              (151,000)    (131,400)
                                                      ----------   ----------

    Net cash used for investing activities              (151,000)    (131,400)

Cash provided by financing activities:
    Issuance of common shares                          1,114,600            -

Effect of foreign exchange on cash                        (5,100)     (10,000)
                                                      ----------   ----------

Net increase in cash and cash equivalents              1,021,000      177,100

Cash and cash equivalents, beginning of period           866,000      491,000
                                                      ----------   ----------

Cash and cash equivalents, end of period              $1,887,000   $  668,100
                                                      ----------   ----------
                                                      ----------   ----------

Supplemental disclosure of cash flow information:

  Interest paid                                       $      800   $      600
                                                      ----------   ----------
                                                      ----------   ----------

  Income taxes paid                                   $  344,000   $  126,100
                                                      ----------   ----------
                                                      ----------   ----------


     See accompanying notes to consolidated financial statements.


                                   3
<PAGE>

                    NORTH AMERICAN SCIENTIFIC, INC.


              NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



NOTE 1 - ORGANIZATION AND SUMMARY OF
 SIGNIFICANT ACCOUNTING POLICIES:

North American Scientific, Inc. manufactures and distributes a line of low-level
radiation sources and standards for medical, scientific, and industrial uses.
References to the "Company" include both the parent company and its subsidiary.

BASIS OF PRESENTATION

The consolidated financial statements have been prepared by North American
Scientific, Inc. (the "Company"), without audit, pursuant to the rules and
regulations of the Securities and Exchange Commission (the "Commission").
Certain information and footnote disclosures normally included in financial
statements prepared in accordance with generally accepted accounting principles
have been condensed or omitted pursuant to such rules and regulations, although
the Company believes that the disclosures are adequate to make the information
not misleading.  These financial statements should be read in conjunction with
the financial statements and related notes contained in the Company's 1996
Annual Report.  Other than as indicated herein, there have been no significant
changes from the data presented in said Report.

In the opinion of management, the financial statements contain all adjustments
necessary to present fairly the financial position of the Company as of July 31,
1997 and July 31, 1996, and the results of operations and cash flows for the
same periods.

INVENTORIES

Inventories are valued at the lower-of-cost or market.  Cost is determined using
the first-in-first-out method.

RECLASSIFICATION

Certain reclassifications of previously reported amounts have been made to
conform to the current year's presentation.


                                   4
<PAGE>

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF
OPERATION

    The following discussion should be read in conjunction with the
consolidated financial statements contained herein and the notes thereto.
Certain matters discussed in this Report on Form 10-QSB are forward looking as
that term is defined by: (i) the Private Securities Litigation Reform Act of
1995 (the "Act") and (ii) releases made by the Commission.  These statements are
being made pursuant to the provisions of the Act and with the intention of
obtaining the benefits of the "safe harbor" provisions of the Act.  The Company
cautions investors that any forward looking statements made by the Company are
not guarantees of future performance and that actual results may differ
materially from those in such forward looking statements as a result of various
factors, including but not limited to the following: changing market conditions;
the availability and cost of raw materials; the timing of customer's orders; the
timely development and market acceptance of the Company's products; the impact
of competitive products and pricing; and other risks detailed herein or detailed
from time to time in the Company's filings with the Commission.


THREE AND NINE MONTH PERIODS ENDED JULY 31, 1997 COMPARED WITH THREE AND NINE
MONTH PERIODS ENDED JULY 31, 1996

    Net sales decreased to $820,400 for the 1997 three month period from
$836,300 for the 1996 period under review, a  decrease of approximately 2%.  The
reduction in net sales was principally the result of a delay in shipment of
approximately $100,000 of product due to delays in receipt of certain  customer
supplied shielded assemblies necessary for shipment.  This delay was not
controllable by the Company and has since been corrected.  Although the Company
believes this specific problem will not recur, there can be no assurance that
similar delays will not be experienced in the future.  The Company anticipates
recognition of income from this delayed sale of product in the fourth quarter of
the fiscal year.  Net income decreased to $41,200, or $0.01 per share, in the
1997 period, from a net income of $115,800, or $0.04 per share in the 1996 three
month period.  Net sales for the first nine months increased to $2,589,500 for
the 1997 period from $2,030,600 for the 1996 period, an increase of
approximately 28%.  Net income for the first nine months decreased to  $220,200,
or $0.07 per share, in the 1997 period, from a net income of $261,500, or $0.09
per share, in the 1996 period, a decrease of approximately 16%.

    For the third quarter, cost of goods sold increased to $449,100 in 1997 
from $417,700 in the 1996 fiscal period, an increase of approximately 8%.  
For the nine month period comparison, cost of goods sold increased to 
$1,367,100 in 1997 from $1,024,500 in the 1996 fiscal period, an increase of 
approximately 33%.  While a portion of this increase was generally consistent 
with the increase in net sales, the Company did experience a relative 
increase in sales of certain relatively higher costs nuclide product lines. 
The Company also experienced costs associated with certain development 
efforts undertaken in the second quarter.

    For the third quarter, general and administrative expenses increased to 
$296,300 in 1997 from $218,800 in the 1996, an increase of approximately 35%. 
For the nine month comparison, general and administrative expenses increased 
to $851,300 in 1997 from $574,200 in the 1996 fiscal period, an increase of 
approximately 48%.  The increase in general and administrative expenses in 
the third quarter was primarily the result of promotional expenses and 
professional fees, including fees associated with the Company's agreements 
with Mentor Corporation ("Mentor"), which provide for the investment of an 
aggregate of $3 million in Common and Preferred Stock of the Company by 
Mentor and for Mentor to distribute I-125 brachytherapy sources to be 
manufactured by the Company.  Increased expenses for the nine month fiscal 
1997 period were primarily the result of legal expenses associated with the 
Company's defense of a lawsuit which was voluntarily dismissed by the 
plaintiff earlier in this fiscal year; the expenses associated with the 
Mentor agreements described above; and one time professional fees associated 
with new technical sales literature.

                                   5
<PAGE>

LIQUIDITY AND CAPITAL RESOURCES

    At July 31, 1997, the Company had cash and short-term deposits aggregating
approximately $ 1,887,000, compared to $ 668,100 at July 31, 1996.  The increase
in the Company's cash position was primarily the result of a $1 million
investment by Mentor in the Company's Common Stock.  To date, the Company's
short-term liquidity needs have generally consisted of operating capital to
finance growth in trade accounts receivable, inventories, and new product
development.  The Company has satisfied these needs primarily through a
combination of private and public equity financings and from cash generated by
operations.  The Company has no long-term debt and has not had, or had the need
for, a line of credit or similar arrangement with a bank.  Management
anticipates that the Company's continued growth will be funded from operations
or sales of securities and believes that it will continue to have sufficient
cash resources from such sources to fund its cash needs.

    For the nine month period ended July 31, 1997, cash flow from operations
generated approximately $ 62,500, compared to $ 318,500 for the comparable 1996
period.  Cash flow in investing activities used approximately $ 151,000 in the
1997 fiscal period compared to $ 131,400 in the comparable 1996 period.  The
increased use of cash for investing activities in the current period resulted
primarily from equipment purchases associated with the Company's I-125
brachytherapy source line for treatment of prostate cancer, which will be
marketed by Mentor.




                      PART II   OTHER INFORMATION


The Company was not required to report the information pursuant to Items 1
through 6 of Part II of Form 10-QSB for any of the three months ended July 31,
1997, except as follows:

ITEM 2.     CHANGES IN SECURITIES

c)  On June 16, 1997, the Company issued 250,000 shares of its Common Stock, 
par value $0.01 per share, to Mentor, pursuant to the Stock Purchase 
Agreement attached hereto as Exhibit 10.1, at a price of $4.00 per share.  
The issuance of such shares was exempt under the Securities Act of 1933, as 
amended, pursuant to Section 4 (2) thereof, as a transaction not involving a 
public offering.

ITEM 6.     EXHIBITS AND REPORTS ON FORM 8-K

a)  Exhibits - The following Exhibits are filed herewith:

       Exhibit 10.1 - Stock Purchase Agreement dated as of June 16, 1997 between
                       the Registrant and Mentor Corporation.

       Exhibit 10.2 - Exclusive Marketing and Distribution Agreement dated as of
                      June 16, 1997 between the Registrant and Mentor 
                      Corporation.

       Exhibit 27 - Financial Data Schedule (EDGAR only)

b)  Reports on Form 8-K - No such reports were filed during the quarter for
which this report is filed.


                                   6
<PAGE>

                              SIGNATURES

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 thereunto duly authorized.



                                 NORTH AMERICAN SCIENTIFIC, INC.
                                          (Registrant)



Date   September 10, 1997         By:      \s\  L. Michael Cutrer
    ----------------------------     ----------------------------------------
                                  L. Michael Cutrer
                                  President and Chief Executive Officer
                                  (Principal Executive, Accounting and
                                  Financial Officer)


                                   7

<PAGE>

                               STOCK PURCHASE AGREEMENT




                                       COMPANY:

                           NORTH AMERICAN SCIENTIFIC, INC.,
                                 a Delaware corporation



                                      INVESTOR:

                                 MENTOR CORPORATION,
                               a Minnesota corporation





<PAGE>

                               STOCK PURCHASE AGREEMENT


    THIS STOCK PURCHASE AGREEMENT (this "Agreement"), dated for reference
purposes as June 16, 1997, is between NORTH AMERICAN SCIENTIFIC, INC.,  a
Delaware corporation (the "Company"), and MENTOR CORPORATION, a Minnesota
corporation (the "Investor), with respect to the following facts.

    A.    Simultaneously with the execution of this Agreement, the Company and
the Investor are entering into an Exclusive Marketing and Distribution Agreement
(the "Distribution Agreement") pursuant to which Investor will acquire the right
to market and distribute on an exclusive basis for use in the Field of Use
identified in the Distribution Agreement certain radioactive sources proposed to
be manufactured by the Company.

    B.    In connection with their execution of the Distribution Agreement, the
Company desires to sell and issue to the Investor and the Investor desires to
purchase from the Company, shares of Common Stock and Preferred Stock of the
Company on the terms and conditions set forth in this Agreement.

    NOW, THEREFORE, in consideration of the mutual promises set forth below and
intending to be legally bound, the parties hereby agree as follows:

1.  DEFINITIONS

    For purposes of this Agreement, the terms set forth below shall be used as
they are defined in this Section.

    1.1   Annual Report.   The term "Annual Report" means the Company's Annual
Report on Form 10-KSB for the fiscal year ended October 31, 1996 and filed with
the Securities and Exchange Commission (the "Commission") on January 21, 1997.

    1.2   Certificate of Designation.  The term "Certificate of Designation"
means the Certificate of Designation of the Rights, Preferences and Privileges
of the Company's Series A Preferred Stock to be issued to the Investor under
this Agreement.  A copy of the Certificate of Designation is set forth in
Exhibit A hereto.

    1.3   Closing Date.  The date of the closing of the purchase of the Common
Stock, or the date of the closing of the purchase of the Series A Preferred
Stock, as the case may be.

    1.4   Company Documents.  The term "Company Documents" means and includes
the Distribution Agreement and any other contract or agreement being entered
into or delivered pursuant to or in connection with this Agreement.

    1.5   Distribution Agreement.  The term "Distribution



<PAGE>

Agreement" means the  Exclusive Marketing and Distribution Agreement between the
Company and the Investor referred to in Recital A, above, a copy of which is
attached as EXHIBIT B to this Agreement.

    1.6   First Closing.  The term "First Closing" means the closing of the
purchase by the Investor of 250,000 shares of the Common Stock of the Company.

    1.7   Intellectual Property.  The term "Intellectual Property" means and
includes all inventions, patents, patent applications, copyrights and copyright
rights, trademarks, service marks, trade secrets, and other proprietary rights,
and all foreign, domestic, federal and state registrations and applications
applicable to or covering any or all of the foregoing.

    1.8   Material Agreement.  Any contract or agreement to which the Company
is a party or by which the Company or its assets are bound, a breach of which
could reasonably be expected to have a material adverse effect on the Company's
business, operations or financial condition.

    1.9   Quarterly Report.  The term "Quarterly Report" means the Company's
Quarterly Report on Form 10-QSB for the fiscal quarter ended January 31, 1997
and filed with the Commission on or about March 15, 1997.

    1.10  SEC Filings.  All forms, reports, schedules, statements and other
documents required to be filed by either party since October 31, 1996 under the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), or the
Securities Act (as such documents have been amended since the time of their
filing to the date of this Agreement.

    1.11  Second Closing.  The term "Second Closing" means the closing of the
purchase by the Investor of 333,334 shares of Series A Preferred Stock of the
Company.

    1.12  Series A Preferred Stock.  The term "Series A Preferred Stock" means
those shares of Series A Convertible Preferred Stock of the Company to be issued
pursuant to and having the rights, preferences and privileges set forth in the
Certificate of Designation attached as EXHIBIT A to this Agreement.

    1.13  Shares.  The term "Shares" means and includes the shares of Common
Stock and Series A Preferred Stock issuable by the Company to the Investor
pursuant to this Agreement.

    1.14  Taxes.  The term "Taxes" means and includes all federal, state, local
and foreign income, franchise, gross receipts, business license, sales, use,
withholding, employment, property and other taxes imposed on the Company or any
of its property for any taxable period or portion thereof that ends on or


<PAGE>

before the Closing Date, and all interest, penalties and additions to tax
attributable thereto.

    1.15  Tax Returns.  The term "Tax Returns" means and includes all tax and
information returns, reports and other filings required to be made by the
Company with any federal, state, local or foreign governmental agency with
respect to any Taxes applicable to or imposed upon the Company with respect to
any period ending on or before the Closing Date.

2.  AGREEMENT TO SELL AND PURCHASE SHARES

    Subject to the terms and conditions of this Agreement and in reliance upon
the representations and warranties contained herein, the Company hereby agrees
to issue and sell to the Investor and the Investor agrees to purchase from the
Company:

    2.1   Sale of Common Stock.  At the First Closing:  Two Hundred Fifty
Thousand (250,000) shares of its Common Stock at a purchase price of Four
Dollars ($4.00) per share for a total purchase price of One Million Dollars
($1,000,000); and

    2.2   Sale of Series A Preferred Stock.  At the Second Closing:  Three
Hundred Thirty-Three Thousand Three Hundred Thirty-Four (333,334) shares of
Series A Preferred Stock at a purchase price of Six Dollars ($6.00) per share
for a total purchase price of Two Million Dollars ($2,000,004).

3.  CLOSING DATES; DELIVERIES BY THE PARTIES

    3.1   Closing Dates.  Each closing shall be consummated through telephone
conference calls, the execution of closing documents in counterparts and their
delivery by facsimile transmission, and a wire transfer of funds, followed by
the delivery of manually signed original documents and certificates through an
overnight courier or delivery service, without the need for the parties or their
counsel to be present at the same location.

          3.1.1    The First Closing shall take place concurrently with the
delivery to the Investor of the opinion of patent counsel called for by Section
4.1.7 of this Agreement.

          3.1.2    The Second Closing shall take place within three (3)
business days after the date on which NAMS has secured the approvals from the
United States Food and Drug Administration necessary to market and sell its
I-125 radioactive sources in interstate commerce in the United States.

    3.2   Deliveries by the Company.  On the applicable Closing Date, the
Company shall make the following deliveries to or for the benefit of the
Investor:

          3.2.1    At the First Closing, the Company shall


<PAGE>

deliver the following documents and instruments:

              A.   The Distribution Agreement, duly executed by the Company;

              B.   An opinion of the Company's patent counsel as called for by
Section 4.1.7, below, in content satisfactory to the Company and its counsel;

              C.   Stock Certificates evidencing the Shares of Common Stock
purchased by the Investor; and

              D.   Such other agreements, documents and certificates as the
Investor reasonably may request for purposes of effecting the transactions
contemplated in this Agreement and the other Company Documents.

          3.2.2    At the Second Closing, the Company shall deliver the
following documents and instruments:

              A.   A copy of the 510(K) premarketing approval issued by the
Food and Drug Administration authorizing the manufacture, sale and use of the
Model MED 36-31-A Brachytherodine I-125 Sources proposed to be manufactured by
the Company.

              B.   Stock Certificates evidencing the Shares of Preferred Stock
being purchased by the Investor;

              C.   A certificate executed by the Chief Executive Officer of the
Company stating in effect that (1) the representations and warranties made by
the Company in SECTION 6 of this Agreement continue to be true and correct in
all material respects and (2) all covenants, agreements and conditions contained
in this Agreement to be performed by the Company on or prior to the Second
Closing Date, or which are a condition precedent to the obligation of Investor
to purchase the Series A Preferred Stock, have been performed, complied with or
satisfied in all material respects; and

              D.   Such other agreements, documents and certificates as the
Investor reasonably may request for purposes of effecting the transactions
contemplated in this Agreement and the other Company Documents.

    3.3   Deliveries by the Investor.  On the applicable Closing Date, the
Investor shall make the following deliveries to or for the benefit of the
Company:

          3.3.1    The following documents and instruments shall be delivered
at the First Closing:

              A.   The Distribution Agreement, duly executed by Investor;

<PAGE>

              B.   Payment by wire transfer of the purchase price for the
Shares of Common Stock to be purchased by the Investor under this Agreement; and

              C.   Such other agreements, documents and certificates as the
Company reasonably may request for purposes of effecting the transactions
contemplated in this Agreement or any of the other agreements contemplated in
this Agreement and to which the Investor is a party.

          3.3.2    At the Second Closing, the Investor shall make payment for
the Shares of Preferred Stock by wire transfer and shall deliver:

              A.   A certificate executed by the Chief Executive Officer or the
President of Investor stating in effect that (1) the representations and
warranties made by the Investor in SECTION 7 of this Agreement continue to be
true and correct in all material respects and (2) all covenants, agreements and
conditions contained in this Agreement to be performed by the Investor on or
prior to the Second Closing Date, or which are a condition precedent to the
obligation of the Company to sell the Series A Preferred Stock, have been
performed, complied with or satisfied in all material respects; and

              B..  Such other agreements, documents and certificates as the
Company reasonably may request for purposes of effecting the transactions
contemplated in this Agreement or any of the other agreements contemplated in
this Agreement and to which the Investor is a party.

    3.4   Simultaneous Delivery.  The execution and delivery of the agreements
and documents described in this SECTION 3 and to be delivered at the respective
Closings, and the consummation of all of the transactions to be consummated at
each Closing shall, as to each such Closing, be deemed to have been executed and
delivered and to have taken place simultaneously, and no execution, delivery,
payment or transaction scheduled to occur at a Closing shall be deemed to have
occurred until all such executions, deliveries, payments and transactions
scheduled to occur with respect to that Closing have in fact occurred.

4.  CONDITIONS TO THE OBLIGATIONS OF THE INVESTOR

    4.1   Conditions to the First Closing.  The obligation of the Investor to
purchase the Shares of Common Stock is subject to the fulfillment, or the waiver
by the Investor, of each of the following conditions on or before the First
Closing Date:

          4.1.1    Company's Representations.  The representations and
warranties made by the Company in SECTION 6 hereof shall be true and correct in
all material respects when made, and shall be deemed repeated at and as of the
Closing Date and shall be true and correct in all material respects at and as of
the



<PAGE>

Closing Date.

          4.1.2    Company's Performance.  All covenants, agreements and
conditions contained in this Agreement to be performed by the Company on or
prior to the Closing Date shall have been performed or complied with in all
material respects.

          4.1.3    Issuance of Shares.  On the Closing Date, the purchase of
the Shares by the Investor hereunder shall be legally permitted by all laws and
regulations to which the Investor and the Company are subject.

          4.1.4    Material Adverse Change.  From January 31, 1997 to the
Closing Date, there shall not have occurred any material adverse change in the
Company's business, operations or financial condition.

          4.1.5    Series A Preferences.  The Board of Directors of the Company
shall have adopted the recitals and resolutions set forth in the Certificate of
Designation.

          4.1.6    Opinion of Counsel.  Investor shall have received the
opinion of counsel of the Company with respect to (a) its organization, good
standing, and qualification to do business, (b) the due authorization and valid
issuance of the Shares of the Common Stock and their status as fully paid,
non-assessable shares, and (c) such other matters as counsel to the Investor may
reasonably request.

          4.1.7    Opinion of Patent Counsel.  There shall have been delivered
to the Investor by the Company an opinion of the Company's patent counsel in
content satisfactory to Investor and its counsel stating in substance that such
patent counsel is generally knowledgeable with respect to the patent rights of
Third Parties relating to radioactive sources, that such counsel has conducted
such inquiry and investigation as it deemed reasonably necessary for the purpose
of determining whether the presently intended manufacture, sale and/or use of
the I-125 Sources manufactured by NAMS infringes any patent or intellectual
property rights of any Third Party, and that nothing has come to the attention
of such counsel during the course of its inquiries and investigations that would
lead it to believe that the presently intended manufacture, sale and/or use of
the I-125 Sources manufactured by NAMS infringes any patent or intellectual
property rights of any Third Party.

          4.1.8    Other Matters.  All corporate and other proceedings in
connection with the transactions contemplated by this Agreement and the other
Company Documents and all documents and instruments incident to such
transactions shall be reasonably satisfactory in substance and form to the
Investor and its counsel, and the Investor and its counsel shall have received
all such counterpart originals or certified or other copies of such documents as
they may reasonably request.


<PAGE>

    4.2   Conditions to the Second Closing.  The obligation of the Investor to
purchase the Shares of Preferred Stock is subject to the fulfillment, or the
waiver by the Investor, of each of the following conditions on or before the
First Closing Date:

          4.2.1    NAMS shall have provided MENTOR with a copy of the 510K
premarketing approval obtained from the United States Food and Drug
Administration necessary to market and sell its I-125 radioactive sources in
interstate commerce in the United States; and

          4.2.2    The Certificate of Designation shall have been filed with
the Secretary of State of the State of Delaware and shall be in full force and
effect.

          4.2.3    There have been no material adverse change in the business,
financial condition or the properties of the Company between the date of the
First Closing and the date of the Second Closing.

5.  CONDITIONS TO THE OBLIGATIONS OF THE COMPANY

    The obligations of the Company to issue and sell the Shares to the Investor
at the Closing under this Agreement are subject to fulfillment, or the waiver,
of each of the following conditions on or before the Closing at which such
purchase and sale is to occur:

    5.1   Investor's Representations.  The representations and warranties made
by the Investor in SECTION 7 hereto shall be true and correct in all material
respects when made, and shall be deemed repeated at and as of the Closing Date
and shall be true and correct in all material respects at and as of the Closing
Date.

    5.2   Investor Performance.  All covenants, agreements and conditions
contained in this Agreement to be performed by the Investor on or prior to the
Closing Date shall have been performed or complied with in all material
respects.

    5.3   Payment of Purchase Price.  The Investor shall have paid to the
Company the purchase price for the Shares.

    5.4   Company Consents.  The Company shall have obtained all consents,
permits and waivers necessary or appropriate for consummation of the
transactions to be effected at the Closing.

    5.5   Other Matters.  All corporate and other proceedings in connection
with the transactions contemplated by this Agreement and the other Company
Documents and all documents and instruments incident to such transactions shall
be reasonably satisfactory in substance and form to the Company and its counsel,
and the Company and its counsel shall have received all such counterpart
originals or certified or other copies of such documents as they may


<PAGE>

reasonably request.


6.  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

    As a material inducement for the Investor to enter into and perform its
obligations under this Agreement, the Company hereby represents and warrants to
the Investor that all of the following are true and correct as of the date of
this Agreement:

    6.1   Organization and Good Standing.  The Company is a corporation duly
organized, validly existing and in good standing under the laws of its
jurisdiction of incorporation; has all requisite power to own, lease, license
and operate its assets, properties and business and to carry on its business as
conducted during the 12-month period prior to the date hereof, as now conducted
and as proposed to be conducted; and is duly qualified or licensed to do
business as a foreign corporation and is in good standing in every jurisdiction
in which the nature of its business or the location of its properties requires
such qualification or licensing.

    6.2   Due Authorization: Enforceability.  The Company has taken all actions
necessary to authorize it to enter into and perform fully its obligations under
this Agreement and all of the other Company Documents and to consummate the
transactions contemplated herein and therein.  This Agreement and the other
Company Documents are the legal, valid and binding obligations of the Company,
enforceable in accordance with their respective terms, subject, as to
enforcement of remedies, to applicable bankruptcy, insolvency, moratorium,
reorganization and similar laws affecting creditors' rights generally and to
general equitable principles.

    6.3   Authorization of Shares.  The Company has duly authorized the sale
and issuance pursuant to this Agreement of 250,000 shares of its Common Stock
and 333,334 shares of its Series A Preferred Stock.

    6.4   Validity of This Agreement.  The Company has full power and authority
to execute and deliver this Agreement and each of the other Company Documents,
to issue the Shares to the Investor pursuant to this Agreement, and to perform
its obligations under and to consummate the transactions contemplated by this
Agreement and each of the other Company Documents.  The execution, delivery, and
performance by the Company of this Agreement and each of the other Company
Documents, the issuance and sale of the Shares pursuant to this Agreement, and
the consummation of the transactions contemplated by this Agreement and each of
the other Company Documents, (a) have been duly authorized and approved by all
necessary corporate action on the part of the Company, its officers, directors
and shareholders, and (b) will not violate any provision of law and will not
conflict with, or result in a breach of, any of the terms of, or constitute


<PAGE>

a default under, the Company's Certificate of Incorporation, Bylaws, or any
contract or agreement, whether written or oral, judgment, decree, order, or
other restriction to which the Company is a party or by which it or any of its
properties is bound, and (c) will not result in the creation of any mortgage,
lien, charge or encumbrance upon any of the properties or assets of the Company
pursuant to the terms of its Certificate of Incorporation, Bylaws or any
Material Agreement, instrument, judgment, decree or order applicable to it.

    6.5   Capital Structure.  The authorized capital stock of the Company
consists of (a) 2,000,000 shares of Preferred Stock, without par value, of which
333,334 shares have been designated Series A Preferred Stock and (b) 10,000,000
shares of Common Stock having a par value of $.01 per share.  As of the date of
this Agreement, 3,073,201 shares of the Common Stock of the Company are issued
and outstanding  and there are no shares of the Series A Preferred Stock issued
and outstanding.  There are no outstanding preemptive rights, and there are no
outstanding subscriptions, options, rights, warrants, convertible securities, or
other agreements or commitments obligating the Company to issue or to transfer
from treasury any shares of its capital stock of any class or kind whatsoever,
other than the rights, options and warrants described in the Company's SEC
Filings.  The outstanding shares of Common Stock and Preferred Stock of the
Company are duly and validly issued, fully paid and nonassessable, and were
issued in compliance with all applicable federal and state securities laws.

    6.6   Consents.  Assuming the accuracy of the warranties and
representations of, and the performance of this Agreement by, the Investor, no
consent, approval, or authorization of or registration, qualification,
designation, declaration, or filing with any governmental authority on the part
of the Company is required in connection with the valid execution, delivery, or
performance of this Agreement and each of the other Company Documents, or the
offer, sale, or issuance of the Shares pursuant to this Agreement, or the
consummation of any other transaction contemplated in this Agreement and each of
the other Company Documents, except for the filing of notices with federal and
state securities agencies with respect to the sale and issuance of the Shares
and such consents, approvals, and authorizations as have already been obtained
by the Company.

    6.7   Authority to Issue Stock.  The Shares to be issued under this
Agreement have been duly authorized and are not subject to any preemptive or
protective rights on the part of the holders of any class of securities of the
Company.  The issuance, sale, and delivery of the Shares pursuant to this
Agreement have been duly authorized by all necessary corporate action, and when
issued, sold, and delivered in accordance with the provisions of this Agreement
and upon the Company's receipt of the full purchase price therefor, will be duly
and validly issued, fully paid, and nonassessable and will be issued in
compliance with all applicable



<PAGE>

federal and state securities laws.

    6.8   Securities Laws.  Assuming the accuracy of the warranties and
representations of, and the performance of this Agreement by, the Investor, the
offer, issuance, and sale of the Shares pursuant to this Agreement are, and at
the time of issuance of the Shares, will be, exempt from the registration and
prospectus delivery requirements of the Securities Act of 1933, as amended (the
"Securities Act") and the qualification requirements of applicable state
securities laws.

    6.9   Compliance with Laws; Governmental Matters.   The Company has in all
material respects complied with, and is now in all material respects in
compliance with, all laws and orders known to the Company to be applicable to
it.  Except to the extent, if any, disclosed to the Investor in writing, the
Company holds all business licenses, permits, franchises, orders and government
approvals material to or necessary for the conduct of the Company's business as
previously conducted during the 12-month period prior to the date hereof, as
presently conducted or, except for FDA premarketing approval with respect to the
Company's I-125 sources, as proposed to be conducted, other than those permits,
if any, the absence of which would not have an adverse effect on the Company's
business, operations or financial condition.  Each license and permit is in full
force and effect; the Company is now and has at all times in the past been in
all material respects in full compliance with each thereof; no violations are or
have in the last five years been recorded by any governmental authority in
respect of any thereof; and no proceeding is pending or, to the best of the
Company's knowledge, threatened, to revoke, amend or limit any thereof.  There
are no pending or, to the best of the Company's knowledge, threatened
proceedings by or before any governmental authority which involve new special
assessments, assessment districts, bonds, Taxes, condemnation actions, laws or
orders or similar matters which, if instituted, could reasonably be expected to
have a material adverse effect upon the condition (financial or otherwise),
assets, liabilities, business or prospects of the Company.

    6.10  Intellectual Property.  The Company has good and marketable title to,
or a valid license interest in, all Intellectual Property used in and material
to the Company's business.  To the best of the Company's knowledge, no person
has asserted any right or interest adverse to the Company in respect of any of
the Company's Intellectual Property rights which would have a material adverse
effect on the Company and its business other than those rights, if any, that
have been disclosed to Investor by the Company in writing.  To the best of the
Company's knowledge, the conduct by the Company of its business does not
infringe upon or violate the Intellectual Property rights of any other person or
entity, nor has there been any claim to such effect.

    6.11  Financial Statements and Reports.  The Company has filed with the
Commission, and has heretofore made available to


<PAGE>

the Investor true, correct and complete copies of its SEC Filings.  The
Company's SEC Filings, including without limitation the Annual Report, the
Quarterly Report and any financial statements or schedules included in any of
such Filings, at the time filed, complied in all material respects with the
applicable requirements of the Exchange Act and the Securities Act, as the case
may be, and the applicable rules and regulations of the Commission thereunder.
The financial statements with the notes thereto, contained in the Company's SEC
Filings are in accordance with the respective books and records of the Company
and its consolidated subsidiaries, have been prepared in accordance with
generally accepted accounting principles ("GAAP") consistently applied
throughout the periods involved, except as otherwise indicated therein, and
present fairly (subject, in the case of unaudited statements, to normal
recurring audit adjustments) the consolidated financial position of the Company
and its consolidated subsidiaries as of the respective dates, and the
consolidated results of operations and retained earnings and cash flows (or
changes in financial position) of the Company and its consolidated subsidiaries
for the respective periods indicated thereby.

          6.11.1   Except as and to the extent set forth in the Quarterly
Report, as of January 31, 1997 neither the Company nor any of its consolidated
subsidiaries had any known liabilities of any nature, whether accrued, absolute,
contingent or otherwise, and whether due or to become due, which would be
required by U.S. GAAP to be reflected on a consolidated balance sheet of the
Company and its consolidated subsidiaries (including the notes thereto).

          6.11.2   None of the following events has occurred or arisen since
January 31, 1997:

              A.   Any material adverse change in the financial condition or
operations of the business of the Company and its consolidated subsidiaries,
considered as a whole, from that shown in the Quarterly Report; or

              B.   Any damage or destruction in the nature of a casualty loss,
whether or not covered by insurance, materially and adversely affecting any
property or business of the Company or any of its subsidiaries or affiliates
which is material to the financial condition or the operation of the business of
the Company and its subsidiaries considered as a whole; or

              C.   Other than in the ordinary course of business consistent
with past practice, any increase in the compensation payable currently or in the
future by the Company or any of its subsidiaries under any employment agreement,
whether written or oral, with any officer or salaried employee of the Company or
any of its subsidiaries whose calendar year 1996 compensation exceeded $100,000,
or in any bonus, insurance, pension or other benefit plan made for or with any
of such officers or employees; or


<PAGE>

              D.   Any actual or threatened strike, slowdown, stoppage or other
labor dispute which materially and adversely affects, or which the Company
believes may materially and adversely affect, the business or prospects of the
Company and its subsidiaries considered as a whole; or

              E.   Any extraordinary loss (as defined in Opinion No. 30 of the
Accounting Principles Board of the American Institute of Certified Public
Accountants ("Opinion No. 30")) suffered by the Company or any of its
subsidiaries which, singly or in the aggregate, is material to the Company and
its subsidiaries considered as a whole.

          6.11.3   Since January 31, 1997, neither the Company nor any of its
subsidiaries has engaged in any transaction material to the Company and its
subsidiaries, considered as a whole, not in the ordinary course of its business,
other than the transactions contemplated by this Agreement and the Distribution
Agreement.

          6.11.4   No statement contained in any of the Company's SEC Filings,
as of the date of such Filing, contained any untrue statement of a material
fact, or omitted to state a material fact necessary to make the statements
contained therein not misleading in light of the circumstances in which such
statements were made.

    6.12  Full Disclosure.  All documents and other papers delivered, or to be
delivered, to the Investor by or on behalf of the Company in connection with
this Agreement and the other Company Documents and the transactions contemplated
herein and therein are, and at the time of delivery will be, true, correct and
complete in all material respects.  The information furnished to the  Investor
by or on behalf of the Company in connection with this Agreement and the other
Company Documents and the transactions contemplated herein and therein does not,
and will not, contain any untrue statement of a material fact and does not, and
will not, omit to state any material fact necessary to make the statements made,
in the context in which they are made, not false or misleading.  There is no
fact known to the Company which the Company has not disclosed to the Investor in
writing which could reasonably be expected to have a material adverse effect
upon the condition (financial or otherwise), assets, liabilities, business,
operations, properties or prospects of the Company.

7.  REPRESENTATIONS AND WARRANTIES OF THE INVESTOR

    As a material inducement for the Company to enter into and perform its
obligations under this Agreement, the Investor hereby represents and warrants to
the Company that all of the following are true and correct as of the date of
this Agreement:

    7.1   Organization and Good Standing.  The Investor is a



<PAGE>

corporation duly organized, validly existing and in good standing under the laws
of its jurisdiction of incorporation; has all requisite power to own, lease,
license and operate its assets, properties and business and to carry on its
business as conducted during the 12-month period prior to the date hereof, as
now conducted and as proposed to be conducted; and is duly qualified or licensed
to do business as a foreign corporation and is in good standing in every
jurisdiction in which the nature of its business or the location of its
properties requires such qualification or licensing.

    7.2   Due Authorization: Enforceability.  The Investor has taken all
actions necessary to authorize it to enter into and perform fully its
obligations under this Agreement and all of the other Company Documents and to
consummate the transactions contemplated herein and therein.  This Agreement and
the other Company Documents are the legal, valid and binding obligations of the
Investor, enforceable in accordance with their respective terms, subject, as to
enforcement of remedies, to applicable bankruptcy, insolvency, moratorium,
reorganization and similar laws affecting creditors' rights generally and to
general equitable principles.

    7.3   Validity of This Agreement.  This Agreement and each of the other
Company Documents constitutes a valid and legally binding obligation of the
Investor, enforceable against the Investor in accordance with its terms,
subject, as to enforcement of remedies, to applicable bankruptcy, insolvency,
moratorium, reorganization and similar laws affecting creditors' rights
generally and to general equitable principles.  The execution, delivery, and
performance by the Investor of this Agreement and each of the other Company
Documents, the purchase of the Shares under this Agreement, and the consummation
of the transactions contemplated by this Agreement and each of the other Company
Documents will not violate any provision of law applicable to the Investor and
will not conflict with, or result in a breach of, any of the terms of, or
constitute a default under, the Investor's Certificate of Incorporation, Bylaws,
or any agreement, instrument, or other restriction to which the Investor is a
party or by which it or any of its properties is bound.

    7.4   Consents.  No consent, approval or authorization of or registration,
qualification or filing with any governmental authority on the part of the
Investor is required in connection with the valid execution, delivery, or
performance of this Agreement and each of the other Company Documents, the
purchase of the Shares pursuant to this Agreement, or the consummation of any
other transaction contemplated in this Agreement and each of the other Company
Documents.




<PAGE>

    7.5   Securities Laws.   Investor satisfies the requirements for an
institutional investor set forth in Section 25102(i) of the California
Corporations Code and is an Accredited Investor within the meaning of Regulation
D under the Securities Act.

          7.5.1    The Investor has had an opportunity to discuss the Company's
business, management and financial affairs with its management and has had an
opportunity to review the Company's facilities.

          7.5.2    The Investor has had the opportunity to obtain and review
all information about the Company, and to ask such questions of the officers and
directors of the Company, that the Investor deems necessary or appropriate in
connection with the Investor's purchase of the Shares and investment in the
Company.  The Investor has had an opportunity to review and obtain copies of all
documents and agreements of the Company referred to in this Agreement or any
Exhibit hereto.

    7.6   Purchase for Investment.  The Investor is purchasing the Shares for
its own account for investment and not with a view to or for sale in connection
with any distribution of any of the Shares, but without prejudice to the
Investor's right to sell or otherwise dispose of all or any part of the Shares
under a registration under the Securities Act or under an exemption from such
registration.  The Investor agrees that upon the request of the Company, it will
execute and deliver to the Company an investment representation letter
reasonably satisfactory to the Company.

    7.7   No Registration of Securities.  The Investor understands that the
Shares to be issued by the Company under this Agreement will not be registered
under the Securities Act or the applicable securities laws of any state in
reliance on the so-called "private offering" exemption provided by Section 4(2)
of the Securities Act, Regulation D promulgated under the Securities Act, and by
such state securities laws; that the Shares will constitute "restricted
securities" within the meaning of the Securities Act, the rules and regulations
of the Commission thereunder, including Rule 144, and the applicable state
securities laws; and that the certificates and documents representing the Shares
will bear the following restrictive legend:

    "THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED
    UNDER THE SECURITIES ACT OF 1933.  THESE SECURITIES HAVE BEEN ACQUIRED FOR
    INVESTMENT AND NOT WITH A VIEW TO, OR IN CONNECTION WITH, THE SALE,
    DISTRIBUTION OR RESALE THEREOF, AND MAY NOT BE TRANSFERRED WITHOUT AN
    EFFECTIVE REGISTRATION STATEMENT FOR SUCH SHARES UNDER THE SECURITIES ACT
    OF 1933, OR PURSUANT TO RULE 144 UNDER SUCH ACT OR AN OPINION OF COUNSEL,
    SKILLED IN SECURITIES MATTERS AND SATISFACTORY TO THE ISSUER, THAT
    REGISTRATION IS NOT REQUIRED UNDER SUCH ACT."




<PAGE>

          7.7.1    The Company may place on the certificates and documents
representing the Shares such additional legends as may be necessary or advisable
for purposes of compliance with the applicable state securities laws.

          7.7.2    The Investor acknowledges that the Shares to be issued to it
under this Agreement must be held indefinitely unless subsequently registered
under the Securities Act or an exemption from such registration is available.
The Investor is aware of the provisions of Rule 144 promulgated under the
Securities Act which permit limited resale of securities purchased in a private
placement subject to the satisfaction of certain conditions.

    7.8   No Adverse Change in Financial Condition.   There has not been any
material adverse change in the financial condition or operations of the business
of the Investor and its consolidated subsidiaries, considered as a whole, from
that shown in its most recent SEC Filing.

8.  SURVIVAL OF WARRANTIES

    The warranties and representations of each of the parties to this Agreement
contained in or made pursuant to SECTIONS 6 and 7 of this Agreement shall
survive the execution and delivery of this Agreement and the sale and delivery
of the Shares under this Agreement, and shall in no way be affected by any
investigation of the subject matter thereof made by or on behalf of the party to
whom such representation, warranty or covenant is made.

9.  FURTHER AGREEMENTS OF THE PARTIES

    9.1   Cooperation.  The Company and the Investor shall each cooperate with
the other in supplying such information as it may reasonably request in order to
complete and file any information reporting forms presently or hereafter
required by the Commission as a condition to the availability of an exemption
from the Securities Act for the sale of any of the Shares issued under this
Agreement.

    9.2   Reservation of Common Stock.  The Company shall reserve and maintain
a sufficient number of shares of Common Stock for issuance upon conversion of
all of the outstanding shares of Series A Preferred Stock issued under this
Agreement.

    9.3   Termination of Covenants.  The covenants of the Company contained in
this SECTION 9 shall terminate, and be of no further force or effect, upon the
date on which the Investor no longer holds at least 100,000 shares of Common
Stock as presently constituted (calculated by assuming full conversion of the
shares of Series A Preferred Stock issued under this Agreement).


<PAGE>

10.       INDEMNIFICATION

    10.1  Indemnification by the Company.  The Company shall indemnify, defend
and hold harmless (a) the Investor, (b) each of the Investor's affiliates,
assigns and successors in interest to the Shares, and (c) each of their
respective shareholders, directors, officers, employees, agents, attorneys and
representatives, from and against any and all losses which may be incurred or
suffered by any such person or entity and which may arise out of or result from
any breach of any representation, warranty, covenant or agreement of the Company
contained in this Agreement or in any of the other Company Documents.

    10.2  Indemnification by the Investor.  The Investor shall indemnify,
defend and hold harmless (a) the Company, (b) each of the affiliates, assigns
and successors in interest to the Company, and (c) each of their respective
shareholders, directors, officers, employees, agents, attorneys and
representatives, from and against any and all losses which may be incurred or
suffered by any such person or entity and which may arise out of or result from
any breach of any representation, warranty, covenant or agreement of the
Investor contained in this Agreement or in any of the other Company Documents.

    10.3  Notice to Indemnifying Party.  If any party (the "Indemnified Party")
receives notice of any claim or other commencement of any action or proceeding
with respect to which any other party (or parties) (the "Indemnifying Party") is
obligated to provide indemnification pursuant to SECTION 10.1 or SECTION 10.2
hereof or pursuant to any other specific indemnification covenant contained in
this Agreement, the Indemnified Party shall promptly give the Indemnifying Party
written notice thereof, which notice shall specify, if known, the amount or an
estimate of the amount of the liability arising therefrom.  The timely delivery
of any such notice shall not be a condition precedent to any liability of the
Indemnifying Party for indemnification hereunder, unless the delay or untimely
delivery of any such notice is materially prejudicial to the right or ability of
the Indemnifying Party to defend against the claim, action or proceeding which
is the subject of the notice.  The Indemnified Party shall not settle or
compromise any claim by a third party for which it is entitled to
indemnification hereunder without the prior written consent of the Indemnifying
Party (which consent shall not be unreasonably withheld or delayed) unless suit
shall have been instituted against it and the Indemnifying Party shall not have
taken control of such suit after notification thereof as provided in Section
10.4 below.

    10.4  Defense by Indemnifying Party.  In connection with any claim giving
rise to indemnity hereunder resulting from or arising out of any claim or legal
proceeding by a person who is not a party to this Agreement, the Indemnifying
Party at its sole cost and expense may, upon written notice to the Indemnified
Party


<PAGE>

delivered within 15 days after receipt by the Indemnifying Party of a notice for
a claim for indemnification, assume the defense of any such claim or legal
proceeding using counsel of its choice (subject to the approval of the
Indemnified Party, which approval shall not be unreasonably withheld or delayed)
if it acknowledges to the Indemnified Party in writing its obligations to
indemnify the Indemnified Party with respect to all elements of such claim. The
Indemnified Party shall be entitled to participate in (but not control) the
defense of any such action, with its counsel and at its own expense; provided
that if the Indemnified Party reasonably determines that there exists a conflict
of interest between the Indemnifying Party (or any constituent party thereof)
and the Indemnified Party (or any constituent party thereof), the Indemnified
Party (or any constituent party thereof) shall have the right to engage separate
counsel, the reasonable costs and expenses of which shall be paid by the
Indemnifying Party, but in no event shall the Indemnifying Party be liable for
(a) the costs and expenses of more than one such separate counsel or (b) the
costs and expenses of any such separate counsel which are incurred prior to the
date on which the Indemnified Party delivers to the Indemnifying Party written
notice of the engagement of such separate counsel.  If the Indemnifying Party
does not assume the defense of any such claim or litigation resulting therefrom,
the Indemnified Party may defend against such claim or litigation, after giving
notice of the same to the Indemnifying Party, on such terms as the Indemnified
Party may deem appropriate, and the Indemnifying Party shall be entitled to
participate in (but not control) the defense of such action, with its counsel
and at its own expense. If the Indemnifying Party thereafter seeks to question
the manner in which the Indemnified Party defended such third-party claim or the
amount or nature of any such settlement, the Indemnifying Party shall have the
burden to prove by a preponderance of the evidence that the Indemnified Party
did not defend or settle such third-party claim in a reasonably prudent manner.

    10.5  Survival of Representations of the Company.  Notwithstanding any
right of the Investor to fully investigate the affairs of the Company and
notwithstanding the Investor's knowledge of facts determined or determinable by
the Investor pursuant to such investigation or right of investigation, the
Investor shall have the right to rely fully upon the representations,
warranties, covenants and agreements of the Company contained in this Agreement
or in any other Company Documents.  With the sole exception of those covenants
which are to be performed by the Company after the Closing (which shall survive
until a claim thereon is barred by the applicable statute of limitations), each
representation, warranty, covenant and agreement of the Company contained herein
shall survive the execution and delivery of this Agreement and the Closing and
shall thereafter terminate and expire on the first (1st) anniversary of the
Closing Date.  No claim or action for indemnity pursuant to Section 10.1 hereof
for breach of any representation, warranty, covenant and agreement of the
Company shall be asserted or


<PAGE>

maintained by the Investor after the expiration of such representation,
warranty, covenant and agreement pursuant to the preceding sentence except for
claims made in writing prior to such expiration and actions (whether instituted
before or after such expiration) based on any claim made in writing prior to
such expiration.

    10.6  Survival of Representations of the Investor.  Each representation,
warranty, covenant and agreement of the Investor contained herein shall survive
the execution and delivery of this Agreement and the Closing and thereafter
shall terminate and expire on the first (1st) anniversary of the Second Closing
Date.  No claim or action for indemnity pursuant to SECTION 10.2 hereof for
breach of any representation, warranty, covenant and agreement of the Investor
shall be asserted or maintained by the Company after the expiration of such
representation, warranty, covenant and agreement pursuant to the preceding
sentence except for claims made in writing prior to such expiration and actions
(whether instituted before or after such expiration) based on any claim made in
writing prior to such expiration.

11. TERMINATION OF AGREEMENT

    11.1  Termination.  This Agreement and the transactions contemplated herein
may be terminated before the Closing Date in the following manner.

          11.1.1   Mutual Consent.  By the mutual written consent of the
Company and the Investor.

          11.1.2   Failure of Conditions to Investor's Performance.  By the
Investor if, by the applicable Closing Date, any condition set forth in
SECTION 4 hereof shall not have been satisfied or waived.

          11.1.3   Failure of Conditions to Company's Performance. By the
Company if, by the applicable Closing Date, any condition set forth in SECTION 5
hereof shall not have been satisfied or waived.

          11.1.4   Material Breach.  By either party upon the material breach
by the other party or the inaccuracy of any representation, warranty or covenant
of the other party set forth in this Agreement and which breach is not cured
within ten (10) days after notice thereof by the non-defaulting party.

    11.2  Liability Upon Termination.  In the event of the termination of this
Agreement pursuant to SECTION 11.1, neither party shall have any liability or
further obligation to the other party except that each party will pay its costs
and expenses incident to the negotiation and preparation of this Agreement and
its performance and compliance with the Agreement, including the fees,
disbursements and expenses of its counsel and advisors.  However, the right of
either party to recover damages for the inaccuracy or



<PAGE>


breach of any representation, warranty or covenant of the other party contained
herein shall survive any termination.

12. GENERAL PROVISIONS

    12.1  Facsimile Signatures.  Signatures of the parties on this Agreement,
the other Company Documents or on any document or instrument delivered pursuant
to this Agreement or any of the other Company Documents shall be deemed to be
original signatures and shall be sufficient to bind the parties.  Each party
covenants to deposit the original, manually signed document for delivery by
courier or by registered or certified mail to the party to whom such facsimile
signature was transmitted within two business days after the date of any such
facsimile transmission.

    12.2  Assignment & Delegation.  Neither party to this Agreement shall be
entitled to assign its rights hereunder without the consent of any other party,
and no party to this Agreement shall delegate its duties and obligations
hereunder without the consent in writing of the party to whom such duty or
obligation is owed, and no such assignment or delegation, if so consented to,
shall relieve the assignor of liability under this Agreement.

    12.3  Further Assurances.  Each party to this Agreement shall take such
additional actions and shall execute such documents and instruments as may be
necessary or proper to cause the occurrence of any conditions precedent or
conditions subsequent to his or her obligation to perform or as may otherwise be
appropriate to effectuate the purposes and intention of this Agreement or to
consummate the transactions contemplated hereunder.

    12.4  Counterparts and Execution.  This Agreement may be executed in one or
more counterparts, each of which shall be deemed an original and all of which
taken together shall constitute one and the same instrument binding on all the
parties hereto, notwithstanding that all of the parties are not signatories to
the original or the same counterpart.

    12.5  Construction.  The parties agree that each party and its counsel have
reviewed and revised this Agreement and that any rule of construction to the
effect that ambiguities are to be resolved against the drafting party shall not
apply in the interpretation of this Agreement or any amendments of exhibits
thereto.

    12.6  Governing Law.  This Agreement, the construction and enforcement of
its terms, and the interpretation of the rights and duties of the parties
hereunder shall be governed by the laws of the State of California.

    12.7  Partial Invalidity.  Each term and provision of this Agreement shall
be valid and enforceable to the fullest extent permitted by law.  If any term or
provision of this Agreement or


<PAGE>

the application thereof to any person or circumstance shall, to any extent, be
invalid or unenforceable, then the remainder of this Agreement or the
application of such term or provision to persons or circumstances other than
those to which it is held invalid or unenforceable, shall not be affected
thereby.

    12.8  Arbitration.  Unless the relief sought requires the exercise of the
equity powers of a court of competent jurisdiction, any dispute arising in
connection with the interpretation or enforcement of the provisions of this
Agreement or any of the other Company Documents, or the application or validity
thereof, shall be submitted to arbitration.  Such arbitration proceedings shall
be held in Los Angeles, California, in accordance with the rules then obtaining
of the American Arbitration Association.  This agreement to arbitrate shall be
specifically enforceable.  Any award rendered in any such arbitration
proceedings shall be final and binding on each of the parties hereto, and
judgment may be entered thereon in any court of competent jurisdiction.

    12.9  Attorneys' Fees.  Should any action or proceeding be necessary to
construe or enforce the terms or conditions of this Agreement, or the
application or validity thereof, then the party prevailing in such action shall
be entitled to recover its reasonable attorneys' fees and other court costs,
together with any costs and attorneys' fees incurred in enforcing any judgment
entered therein.

    12.10 Exhibits.  All exhibits or appendices attached or referred to in this
Agreement are incorporated in this Agreement by such reference and are made a
part hereof as though they were fully set forth herein.

    12.11 Notices.  Any notices permitted or required hereunder shall be in
writing and shall be deemed to have been given (a) on the date of delivery if
delivery of a legible copy was made personally or by facsimile transmission, or
(b) on the second business day after the date on which mailed by registered or
certified mail, return receipt requested, addressed to the party for whom
intended at the address set forth on the signature page of this agreement or
such other address, notice of which is given as provided herein.

    12.12 Expenses.  Each of the parties shall pay all costs and expenses
incurred by it in negotiating and preparing this Agreement and in carrying out
the transactions contemplated hereby.

    12.13 Third Party Benefit.  The parties do not intend to confer any benefit
on any person, firm, corporation, entity or individual other than the parties to
this Agreement by reason, directly or indirectly, of the parties' execution and
delivery of this Agreement or any of the other Company Documents, including all
exhibits hereto and thereto, and any related documents, schedules, certificates
and opinions.


<PAGE>

    12.14 Corporate Securities Law.  THE SALE OF THE SECURITIES WHICH ARE THE
SUBJECT OF THIS AGREEMENT HAS NOT BEEN QUALIFIED WITH THE COMMISSIONER OF
CORPORATIONS OF THE STATE OF CALIFORNIA AND THE ISSUANCE OF SUCH SECURITIES OR
THE PAYMENT OR RECEIPT OF ANY PART OF THE CONSIDERATION THEREFOR PRIOR TO SUCH
QUALIFICATION IS UNLAWFUL, UNLESS THE SALE OF SECURITIES IS EXEMPT FROM THE
QUALIFICATION BY SECTION 25100, 25102 OR 25105 OF THE CALIFORNIA CORPORATIONS
CODE.  THE RIGHTS OF ALL PARTIES TO THIS AGREEMENT ARE EXPRESSLY CONDITIONED
UPON SUCH QUALIFICATION BEING OBTAINED UNLESS THE SALE IS SO EXEMPT.

    12.15 Complete Agreement.  This written instrument, together with any
exhibits or appendices referred to herein, constitutes the entire understanding
of the parties with respect to the matters that are the subject of this
Agreement, and no representations, warranties or covenants not included in this
Agreement may be relied upon by any party hereto.


                      (Signatures appear on the following page)
    IN WITNESS WHEREOF, both parties have executed this Stock Purchase
Agreement to be duly executed on the dates set forth below.
                                        NAMS:

NORTH AMERICAN SCIENTIFIC, INC., a Delaware corporation


           NAMS:                                              MENTOR:

NORTH AMERICAN SCIENTIFIC,                       MENTOR CORPORATION, a
INC., a Delaware corporation                       Minnesota corporation



By                                               By
    Michael Cutrer                                    Christopher J. Conway
    President                                         Chief Executive Officer

Address for Notices:                             Address for Notices:

North American Scientific,                       Mentor Corporation
Inc.                                             5425 Hollister Avenue
7435 Greenbush Avenue                            Santa Barbara, California
North Hollywood, California                      93111
91605                                            PH:  (805) 681-6000
PH:  (818) 503-9201                              FAX: (805) 967-3362
FAX: (818) 503-0764



<PAGE>

                    EXCLUSIVE MARKETING AND DISTRIBUTION AGREEMENT


                                       between


                           NORTH AMERICAN SCIENTIFIC, INC.


                                         AND


                                  MENTOR CORPORATION


<PAGE>

                    EXCLUSIVE MARKETING AND DISTRIBUTION AGREEMENT


    THIS EXCLUSIVE MARKETING AND DISTRIBUTION AGREEMENT ("Agreement"), dated
for reference purposes as of June 16, 1997, is entered into by and between NORTH
AMERICAN SCIENTIFIC, INC., a Delaware corporation ("NAMS"), and MENTOR
CORPORATION, a Minnesota corporation ("MENTOR"), with reference to the following
facts:

    RECITALS:

    A.    NAMS (1) is engaged in the business of producing Iodine-125
radioactive sources (I-125 Sources) utilized in brachytherapy procedures for the
treatment of tumors and other cancerous conditions in soft-tissue organs and (2)
believes that it can manufacture I-125 Sources on a cost-effective basis.

    B.    MENTOR is engaged in the business of manufacturing, marketing and
distributing medical products, equipment and devices used in the treatment of
urological and other disorders.

    C.    There is only a limited supply of I-125 Sources available for use in
brachytherapy procedures, and the parties believe that there is an existing
unmet demand for additional I-125 Sources in the market.  MENTOR therefore
desires to obtain the exclusive right to market and distribute I-125 Sources
produced by NAMS both in the United States and in all foreign markets in the
Field of Use (as hereinafter defined), and NAMS desires to grant such rights to
MENTOR for such purposes on the terms and conditions of this Agreement.

    AGREEMENTS:

    NOW, THEREFORE, the parties, intending to be legally bound, hereby agree as
follows:

1.  DEFINITIONS

    Unless the context in which used requires a different meaning or
interpretation, the following words and phrases shall have the meanings set
forth below:

    1.1   AFFILIATE.  A person or entity that directly or indirectly through
one or more intermediaries controls, is controlled by, or is under common
control with, the designated party, but only for as long as such control
relationship exists.

    1.2   ANCILLARY PRODUCTS.  Instruments, supplies and materials manufactured
by or for MENTOR or NAMS that are designed or are suitable for use in connection
with the use of the Product in the Field of Use, including (by way of example
and not in limitation), drapes, wipes, catheters, ultrasound guides, biopsy
guns, needles, templates and the like.


<PAGE>

    1.3   ANNUAL SALES TARGET.  The quantity of Products required to be sold to
Customers during a Sales Year in order to achieve and maintain the Target Market
Share by the end of such Sales Year.

    1.4   ANTICIPATED REQUIREMENTS.  MENTOR's projected purchases of the
Product as set forth in the forecasts provided by MENTOR to NAMS pursuant to
Section 6.6 of this Agreement.

    1.5   APPLICABLE REGULATORY REQUIREMENTS.  Any statute, law, ordinance,
rule, regulation, requirement, order or decree promulgated by (a) any federal,
state or local government or any agency or instrumentality thereof having
jurisdiction over the manufacture, shipment, handling, use, storage or disposal
of medical devices or radioactive materials, and (b) any government, or any
agency or instrumentality of the government, of any foreign country or a
political subdivision of a foreign country into which the Product is shipped or
in which the Product is sold.

    1.6   COMMERCIAL SALES.  A sale of the Product made by MENTOR to a Customer
in the ordinary course of business (excluding sales of samples or for education
and training purposes) after the Product is Commercially Available.

    1.7   COMMERCIALLY AVAILABLE.  The existence of production capacity
sufficient to satisfy MENTOR's anticipated requirements for the Product during
the first Sales Year.

    1.8   CONFIDENTIAL INFORMATION.  All information of a confidential or
proprietary nature disclosed by MENTOR to NAMS or by NAMS to MENTOR in
connection with or pursuant to this Agreement.  As used in this Agreement,
"Confidential Information" shall not include any information or data disclosed
to a party (the "Recipient") that (a) was in the Recipient's lawful possession
prior to the Recipient's receipt of the same pursuant to this Agreement, (b)
which at the time of the disclosure is or thereafter becomes, through no act or
failure to act on the part of the Recipient, known within the industry or part
of the public domain, (c) which corresponds in substance to information
furnished to the Recipient by a Third Party without breaching any
confidentiality or nondisclosure agreements to which such Third Party was
subject, or (d) which corresponds in substance to information which the
Recipient independently develops.

    1.9   CONTROL.   With respect to any Person or group of Persons,
possession, directly or indirectly, of the power to direct or cause the
direction of management and policies of such Person, whether through the
ownership of voting securities or by contract or otherwise, including (a) in the
case of a corporation, ownership of more than fifty percent (50%) of the shares
of stock entitled to vote for the election of directors and, (b) in the case of
any other business entity, ownership of more than fifty percent (50%) of the
beneficial interest in capital or profits.

    1.10  CUSTOMER.  Any Person to whom NAMS delivers one or more


<PAGE>

units of the Product pursuant to a purchase order received by NAMS, whether such
purchaser order was submitted directly by the purchaser or on behalf of the
purchaser by MENTOR or any other Person.

    1.11  DEFECTIVE PRODUCT.  Product that was not manufactured and produced in
accordance with the requirements of Section 6.15 of this Agreement or that
otherwise fails to conform to the product warranties set forth in that Section.

    1.12  DEFICIENCY NOTICE.  A written notice given by NAMS to MENTOR pursuant
to Section 5.5, below, which (a) sets forth (i) NAMS's opinion as to the size of
the market for the Products in the Field of Use in a specified Geographic Market
Area for a specified Sales Year, and (ii) NAMS's computation of the amount of
additional purchases NAMS believes to be necessary to satisfy the Annual
Purchase Target for such Geographic Market Area for such Sales Year, and (b) is
accompanied by appropriate, independent market data and research in support of
such opinion.

    1.13  DOCUMENTED COST.  The sum of (a) the price paid by MENTOR to NAMS for
units of the Product purchased by MENTOR pursuant to this Agreement plus (b)
taxes, freight and insurance paid by MENTOR in order to take possession of such
Product FOB NAMS's factory.

    1.14  EFFECTIVE DATE.  The date on which the consideration payable by
MENTOR pursuant to Section 3 of this Agreement has been paid to NAMS.

    1.15  EUROPEAN COMMUNITY.  The European Economic Community formed pursuant
to the 1975 Treaty of Rome, as modified by the Single European Act of 1987.

    1.16  FDA.     The United States Food and Drug Administration.

    1.17  FIELD OF USE.  The treatment of prostate cancer through brachytherapy
procedures utilizing I-125 Sources and Palladium 103 Sources.

    1.18  FIXED PRICE.  That portion of the purchase price for the Product that
is payable by MENTOR to NAMS without regard to the Net Selling Price for the
Product received by MENTOR from its Customer.

    1.19  FORCE MAJEURE.  The occurrence of an act of God or other events
beyond the reasonable ability of the party affected thereby to control, such as
wars or insurrection, strikes, fires, vandalism, floods, earthquakes, work
stoppages, embargoes, labor shortages, lack of materials or other similar
circumstances.

    1.20  GEOGRAPHIC MARKET AREA.  The following geographic areas, each of
which shall constitute a separate Geographic Market Area: (a) the United States;
(b) Canada; (c) Central America (including

<PAGE>


Mexico and the Caribbean); (d) the South American continent ; (e) the United
Kingdom and Western Europe; (e) Eastern Europe (including all former Soviet
Republics); (f) the African continent; (g) the Middle East and Southwest Asia
(excluding Afghanistan) ; (h) South Asia (including Afghanistan, Pakistan,
India, Nepal, Bhutan, Bangladesh and Sri Lanka); (i) Southeast Asia (including
Burma, Malaysia, Indonesia and the Philippines; (j) East Asia (Mongolia, China,
Taiwan, Japan, Korea and Hong Kong); and (k) Australia/New Zealand (including
Oceania).

    1.21  IMPROVEMENT.  Any change in the Product that enhances the performance
of the Product or that makes it easier to distribute, store, use or dispose of.

    1.22  INSOLVENT.  With respect to any Person: (a) the filing of an
application by a Person for, or such Person's consent to, the appointment of a
trustee, receiver, or custodian of its other assets; (b) the entry of an order
for relief with respect to a Person in proceedings under the United States
Bankruptcy Code, as amended or superseded from time to time; (c) the making by a
Person of a general assignment for the benefit of creditors; (d) the entry of an
order, judgment, or decree by any court of competent jurisdiction appointing a
trustee, receiver, or custodian of the assets of a Person unless the proceedings
and the person appointed are dismissed within ninety (90) days; or (e) the
failure by a Person generally to pay his or her debts as the debts become due
within the meaning of Section 303(h)(1) of the United States Bankruptcy Code, as
determined by the Bankruptcy Court, or the admission in writing of such Person
of its inability to pay its debts as they become due.

    1.23  INVOLUNTARY BUSINESS DISRUPTION.  An interruption in the marketing
and distribution activities of MENTOR caused by, resulting from or attributable
to (a) the failure or inability of NAMS to supply MENTOR with the quantity of
Product required to be supplied by NAMS pursuant to Section 6.5 of this
Agreement, (b) the pendency of any claim that the Product or the Technology
utilized in its manufacture and production violates the intellectual property
rights of Third Parties, or (c) the absence of a requisite permit, approval or
license or other governmental authorization necessary in order to market and
sell the Product for use in the Field of Use in the United States without
violating the laws of the state in which such sale is proposed to be made, or
(d) the failure to obtain any CE Mark required for sales in the European
Community after such CE Mark is first required, or the subsequent loss of such
CE Mark after it has been obtained, or (e) the occurrence of an event of Force
Majeure.

    1.24  MARKETING PLAN.  The marketing plan developed by MENTOR, and as
modified by the parties from time to time pursuant to Section 5.5 of this
Agreement, for the purpose of attempting to market, sell and distribute a
sufficient quantity of the Product each year to achieve the Target Market Share.
An overview of the Market for which such Plan is to be developed is attached as

<PAGE>


Exhibit B to this Agreement.

    1.25  NET SELLING PRICE.  The net invoice price paid by a Customer and
actually received by MENTOR with respect to Products sold or distributed to
Customers, less returns, sales taxes, cost of shipping insurance, cost of
freight, cost of packing, or other transportation charges, and quantity
discounts given to Customers, dealers, distributors and agents, but only if such
returns, taxes, costs, charges and discounts are expressly stated and separately
invoiced or may be readily determined by acceptable accounting practices.

    1.26  OVERAGE PAYMENTS.  That portion of the transfer price payable for a
Product that exceeds the Fixed Price for the Product

    1.27  PERSON.  Any individual, partnership, association, joint stock
company, joint venture, corporation, limited liability company, trust,
unincorporated organization or governmental entity, or any agency or political
subdivision, or economic unit thereof.

    1.28  PRODUCT.  All I-125 Sources manufactured by or for NAMS for use in
brachytherapy procedures that are used or are suitable for use in brachytherapy
procedures for the treatment of prostate cancer, and all PD-103 Sources if and
when they become subject to this Agreement pursuant to Section 2.3, 2.3, below.

    1.29  PRODUCT LINE.  Each separate type of radioactive source for which
marketing and distribution rights are being granted to MENTOR hereunder, with
I-125 Sources and Pd-103 Sources each constituting a separate Product Line in
the Field of Use.

    1.30  PRODUCT SPECIFICATIONS.  The product specifications, quality control
tests and inspection procedures for the Product that are to be set forth in a
separate schedule prepared by NAMS and approved by MENTOR for attachment as
Exhibit A to this Agreement simultaneously with the execution of this Agreement,
as they may be amended by the mutual agreement of the parties from time to time.

    1.31  PROPORTIONATE SHARE.  The ratios in which MENTOR and NAMS shall share
(a) the costs and expenses of certain actions or proceedings under Section 10 of
this Agreement and (b) any recoveries resulting therefrom, if both parties elect
to participate in any such actions or proceedings.  Each party's Proportionate
Share shall be the percentage obtained by multiplying 100% by a fraction, (a)
the numerator of which is the lost profits attributable to lost sales of the
Product by such party and (b) the denominator of which is the aggregate lost
profits of both parties attributable to lost sales of the Product.

    1.32  REPORTING PERIODS.  With respect to information required to be
included in a  commission or overage payment report to be furnished by one party
to the other pursuant to this Agreement,

<PAGE>


(a) the calendar quarter for which such Report is being furnished, and (b) in
addition, cumulatively for (i) the period commencing with the first day of the
Sales Year and ending on the last day of the calendar quarter for which such
Report is being furnished, and (ii) the period commencing with the Effective
Date of this Agreement and ending on the last day of the calendar quarter for
which such Report is being furnished.

    1.33  SALES YEAR.  The twelve (12)-month period commencing on the Term
Commencement Date, and each subsequent twelve (12)-month period commencing on
the anniversary of the Term Commencement Date.

    1.34  TARGET MARKET SHARE.  The percentage of the market for the use of the
Product in the Field of Use in a specific Geographic Market Area that MENTOR
must acquire and maintain as of the end of the first Sales Year and during each
subsequent Sales Year in order to preserve its exclusive marketing and
distribution rights for the Product in such Geographic Market Area.

    1.35  TECHNOLOGY.  Any proprietary invention, development or improvement,
and any trade secret, "know-how," proprietary manufacturing formula, process,
procedure, method or technique, whether or not patentable or registerable, owned
by or licensed to NAMS to the extent that such technology is reasonably relevant
to the design, manufacture, performance or use of the Product.

    1.36  TERM COMMENCEMENT DATE.  The first day of the first month following
(a) the date on which MENTOR's cumulative Commercial Sales of the Product equal
or exceed Twenty-Five Thousand Dollars ($25,000.00) or (b) the expiration of
ninety (90) days following the date on which NAMS has both (i) obtained 510(K)
approval for the Product from the FDA and (ii) has begun producing usable
Product conforming to the Product Specifications in sufficient quantity to
satisfy MENTOR's Anticipated Requirements for the Product, whichever first
occurs.

    1.37  THIRD PARTY.  Any person other than the legal entity that is a party
to this Agreement.  As used in this Agreement, "Third Party" shall include
agents and employees of a party to this Agreement.

2.  GRANT OF MARKETING AND DISTRIBUTION RIGHTS

    2.1   SCOPE OF DISTRIBUTION RIGHTS.  Subject to its paying the
consideration referred to in Section 3, below, MENTOR shall have an exclusive
license to market and sell the Products for use in the Field of Use both in the
United States and in all foreign markets, including North American markets other
than the United States, for an initial term of five (5) Sales Years as provided
by Section 4.1, below.

    2.2   SUBLICENSES.  The rights granted hereunder are personal to MENTOR and
may not be assigned or sublicensed except that:

<PAGE>


          2.2.1    MENTOR may grant a sublicense to any Affiliate to MENTOR for
as long as (a) MENTOR continues to own at least eighty percent (80%) of the
voting and beneficial ownership interest of such Affiliate, and (b) such
sublicense is on terms and conditions consistent with this Agreement and
expressly provides that it shall terminate simultaneously with the termination
of this Agreement; and

          2.2.2    MENTOR shall be entitled to sell the Products for resale by
subdistributors and marketing representatives who are engaged in the sale and
distribution of MENTOR's products on a regular basis provided that such sales
are made in accordance with the provisions of this Agreement.

    2.3   PD-103 SOURCES.  Any Pd-103 Sources manufactured by or for NAMS that
are suitable for use in the Field of Use shall automatically be included in the
exclusive distribution rights granted to MENTOR hereunder unless the costs and
expense of creating the manufacturing capacity for such Pd-103 Sources was
funded by a Third Party not affiliated with NAMS in accordance with the
provisions of Section 7.1.4 of this Agreement after MENTOR declined the
opportunity to provide the additional capital required to create such
manufacturing capacity.  Should NAMS begin supplying Pd-103 Sources to MENTOR
pursuant to this Agreement, then the parties shall execute an appropriate
addendum to this Agreement setting forth the Annual Sales Targets, Target Market
Share, Transfer Price, and all other terms and conditions for the marketing and
distribution of such Pd-103 Sources by MENTOR.

    2.4   IMPROVEMENTS AND NEW PRODUCTS.  All Improvements or modifications to
the Product that are intended for use or that can be adapted for use in the
Field of Use are included in this Agreement and subject to the distribution
rights granted to MENTOR hereunder.  New or additional products developed or
licensed by NAMS are not covered by this Agreement unless such new or additional
products (a) perform the same or a substantially identical function as the
Products (i.e., radioactive sources designed for insertion into soft-tissue
organs for the purpose of treating tumors or other cancerous conditions) and (b)
are suitable for use in the Field of Use.  NAMS shall not license any other
person to market or sell any such new or additional products for use in the
Field of Use so long as MENTOR has exclusive marketing and distribution rights
under this Agreement.

    2.5   RIGHTS TO PRODUCT IMPROVEMENTS.  Subject to the provisions of Section
7.1.9, below, any Improvements to the Product developed by NAMS during the term
of this Agreement that do not incorporate, modify or improve technology that is
proprietary to MENTOR shall be and remain the property solely of NAMS.  MENTOR
shall not acquire any interest in NAMS's Technology or any Improvements unless
such technology or Improvements are made or developed jointly by the parties
pursuant to a written development

<PAGE>


agreement, but all Improvements or modifications to the Products that are
intended for use or that can be adapted for use in the Field of Use are included
in this Agreement and subject to the distribution rights granted to MENTOR
hereunder.

3.  CONSIDERATION FOR DISTRIBUTION RIGHTS

    The consideration for the distribution rights being granted to MENTOR
hereunder is (a) the capital contribution being made to NAMS by MENTOR pursuant
to the terms of that certain Stock Purchase Agreement being executed by MENTOR
and NAMS concurrently with the execution of this Agreement and (b) the covenants
and agreements of MENTOR contained herein.  This Agreement shall become
effective as of the date on which MENTOR pays to NAMS the capital contributions
called for by such Stock Purchase Agreement.

4.  TERM OF AGREEMENT

    4.1   TERM OF DISTRIBUTION RIGHTS.  The term of the exclusive marketing and
distribution rights granted to MENTOR hereunder shall begin on the Effective
Date of this Agreement and, subject to the provisions of Section 5, below, shall
continue for a period of five (5) full Sales Years from the Term Commencement
Date.

          4.1.1    NAMS shall advise MENTOR in writing once NAMS has obtained
510(K) approval for the Product and has established the production capacity
sufficient to produce Product conforming to the Product Specifications in
sufficient quantity to satisfy MENTOR's Anticipated Requirements.

          4.1.2    If it is subsequently determined (a) by customer returns of
Defective Product that a substantial portion of the Product being produced by
NAMS does not conform to the Product Specifications and is therefore not usable,
or (b) that NAMS is unable to produce a sufficient quantity of the Product to
satisfy MENTOR's Anticipated Requirements, then in either case appropriate
representatives of NAMS and MENTOR shall meet to review, discuss and resolve any
problems that impair the production of usable Product in commercially reasonable
quantities and to establish a new Term Commencement Date.

    4.2   OPTION TO EXTEND.  Provided that (a) this Agreement has not
previously been terminated by either party and (b) MENTOR has attained its
Annual Sales Target in the United States for the initial term of this Agreement
(or has remedied its failure to do so as provided by Section 5.7, below), MENTOR
shall have an option, exercisable on one occasion, to extend the term of this
Agreement for an additional three (3) Sales Years by giving written notice of
its desire to do so within six (6) months prior to the expiration of the initial
term.  Provided, however, that this option to extend shall not expire or lapse
by reason of MENTOR's failure to give such notice within such six (6)-month
period unless, not more than six (6) months prior to the expiration of the then
current term, NAMS gives MENTOR a written reminder that

<PAGE>


such option will expire and terminate unless it is exercised (the "Reminder")
and MENTOR thereafter fails to give written notice of its intent to exercise
such option within fifteen (15) days after its receipt of such Reminder.

5.  MANUFACTURER'S RIGHT TO RECAPTURE UNEXPLOITED MARKETS

    5.1   TARGET MARKET SHARE.  MENTOR shall prepare a Market Plan within
ninety (90) days after the effective date of this Agreement, and shall provide a
copy of such Plan to NAMS for its review and information.  MENTOR shall
diligently attempt to attain (a) Product sales of $1,000,000 and ten percent
(10%) share of the United States market for the use of the Product in the Field
of Use by the end of the first Sales Year and (b) Product sales of $2,000,000
and fifteen percent (15%) share of the United States market for the use of the
Product for such purposes by the end of the second Sales Year, and (c) twenty
percent (20%) of the market for the use of the Product in the Field of Use in
each separate Geographic Market Area by the end of the third and each subsequent
Sales Year.  Should MENTOR fail to make reasonable progress in attaining the
Target Market Share, then at the request of either party appropriate
representatives of NAMS and MENTOR shall meet in order to review and analyze
MENTOR's Marketing Plan, to identify any deficiencies in the plan or in its
implementation, and to develop and implement appropriate remedies.

    5.2   TERMINATION OF EXCLUSIVE DISTRIBUTION RIGHTS.  The right of MENTOR to
continue to market and distribute the Products pursuant to this Agreement on an
exclusive basis is subject to MENTOR's acquiring and maintaining the Target
Market Share set forth in Schedule 1 of this Agreement by the end of the first
Sales Year and during each subsequent Sales Year.  Should MENTOR fail to achieve
and retain its Target Market Share for the Product in a specific Geographic
Market Area, NAMS shall have the right to terminate the exclusive marketing and
distribution rights granted to MENTOR in such Geographic Market Area in
accordance with the provisions of this Section 5 unless such failure is abated
pursuant to Section 5.4, below.

    5.3   CREDIT FOR PRODUCT SALES.  For purposes of determining MENTOR's
market share in a given Geographic Market Area (a) there shall be taken into
account both (i) direct sales by MENTOR and (ii) sales by suppliers and
distributors purchasing from MENTOR as permitted under this Agreement, and (b)
MENTOR shall be conclusively presumed to have satisfied its Target Market Share
for any Sales Year unless NAMS has given a Deficiency Notice to MENTOR within
ninety (90) days after the end of such Sales Year.

    5.4   ABATEMENT.  If by reason of an Involuntary Business Disruption during
the term of this Agreement, MENTOR (a) is unable to begin or to continue
marketing and distributing the Product in a specific Geographic Market Area, or
a material portion thereof, or (b) would incur an unreasonable risk (as
determined by an objective standard) of civil or criminal liability by
continuing

<PAGE>


to do so, then:

          5.4.1    The term of MENTOR's distribution rights under this
Agreement with respect to such Product Line in the affected Geographic Market
Area shall be extended for a period of time equal to such time as the
Involuntary Business Disruption continues to exist; and

          5.4.2    The date by which MENTOR must attain the Target Market Share
for such Product Line with respect to such country or Geographic Market Area
shall be postponed for such period of time as the Involuntary Business
Disruption continues to exist; and

          5.4.3    MENTOR's Target Market Share for the Product Line in the
affected Geographic Market Area for the Sales Year shall be reduced to an amount
mutually agreed to by NAMS and MENTOR that reflects both (a) the impact of the
Involuntary Business Disruption on (i) the supply of Product available to MENTOR
for distribution and sale and (ii) the period of time during which MENTOR was
unable to market and sell the Product Line or would incur an unreasonable risk
in doing so, and (b) the impact of such Involuntary Business Disruption on
MENTOR's future marketing and sales of the Product Line in the affected
Geographic Market Area due to such factors as loss of Customers, purchase orders
or credibility, any impact on seasonal orders and the like.

          5.4.4    If MENTOR and NAMS are unable to agree on the extent to
which MENTOR's Target Market Share shall be reduced pursuant to this Section
5.4, then upon the request of either party such dispute shall be resolved by
binding arbitration in accordance with the commercial arbitration rules of the
American Arbitration Association (the "AAA").  Any such arbitration proceeding
shall be conducted in Los Angeles, California before a panel of three
arbitrators appointed in accordance with the customary procedures of the AAA, at
least one of whom shall have a reasonable level of experience in the marketing
and distribution of medical devices, and shall be limited to a determination of
the extent to which MENTOR's Target Market Share shall be reduced pursuant to
this Section 5.4.  Each of the parties shall bear its own costs and expense in
any such arbitration proceeding and shall pay in equal one-half shares the costs
and fees of the arbitrators.

    5.5   DEFICIENCY NOTICES AND REMEDIAL ACTION.  If NAMS believes that MENTOR
has not attained or may not attain its Target Market Share for a specific
Geographic Market Area, NAMS shall be entitled to give MENTOR a Deficiency
Notice containing the information called for by Section 1.12, above, at any time
after the commencement of the second Sales Year.

          5.5.1    Review of Marketing Plan.  Should NAMS give a Deficiency
Notice to MENTOR hereunder, then appropriate representatives of NAMS and MENTOR
shall meet within thirty (30)

<PAGE>


days after MENTOR's receipt of the Deficiency Notice to review, discuss and
analyze MENTOR's Marketing Plan, to identify any deficiencies in the Plan or in
its implementation, and to develop and agree upon appropriate remedies.

          5.5.2    Revised Marketing Plan.  Within thirty (30) days after the
completion of such meeting, MENTOR shall provide NAMS with a revised Marketing
Plan designed to increase Product sales during the following three full calendar
months to a level sufficient to establish and maintain the Target Market Share
during the following twelve (12) months.

              A.   If during the four full calendar months ending six full
calendar months after MENTOR's receipt of a Deficiency Notice, MENTOR's Product
sales, when computed on an annualized basis using MENTOR's highest level of
Product sales during a period of sixty (60) consecutive days within such
four-month period, are sufficient to attain and retain the Target Market Share
during the following twelve months, then MENTOR shall not be obligated to take
further remedial action for as long as its Product sales, computed on an
annualized basis, remain at a level sufficient to maintain Target Market Share.

              B.   If during the four full calendar months ending six full
calendar months after MENTOR's receipt of a Deficiency Notice,  MENTOR's Product
sales, when computed on an annualized basis utilizing MENTOR's highest level of
Product sales during a period of sixty (60) consecutive days within such four
- -month period, are not sufficient to attain and retain the Target Market Share
during the following twelve months, then NAMS shall be entitled to give a second
Deficiency Notice to MENTOR at any time following the expiration of such
four-month period and prior to the end of the then-current Sales Year unless,
prior to the delivery of such second Deficiency Notice, MENTOR's Product sales,
when computed on an annualized basis, are sufficient to achieve the Target
Market Share by the end of the then-current Sales Year.

                   (1)  Appropriate representatives of NAMS and MENTOR shall
meet within thirty (30) days after MENTOR's receipt of a Second Deficiency
Notice and NAMS shall be entitled to present to MENTOR at any such meeting an
alternative written Marketing Plan designed to increase Product sales during the
following three full calendar months to a level sufficient to establish and
maintain the Target Market Share for the following twelve (12) month period.

                   (2)  Should NAMS propose a Marketing Plan to MENTOR
following the delivery of a second Deficiency Notice to MENTOR pursuant to this
Section 5.5.2 during the same Sales Year, then MENTOR shall be required to elect
in writing within fifteen (15) days after its receipt of the NAMS's Marketing
Plan (the "Election Period"), to either (i) accept and implement the NAMS
Marketing Plan, or (ii) to propose in writing and to adopt and implement an
alternative Marketing Plan.

<PAGE>


                        (a)  Should MENTOR elect to accept and implement NAMS's
Marketing Plan, then:

                             (i)   If during the three full calendar months
following the expiration of the Election Period, MENTOR's Product sales, when
computed on an annualized basis using MENTOR's highest level of Product sales
during a period of 45 consecutive days within such three-month period, equal or
exceed the Annual Sales Target for the following twelve months, then MENTOR
shall not be obligated to take further remedial action for as long as its
Product sales, computed on an annualized basis, remain at a level sufficient to
attain and retain Target Market Share.

                             (ii)  If during the three full calendar months
following the expiration of the Election Period, MENTOR's Product sales, when
computed on an annualized basis using MENTOR's highest level of Product sales
during a period of 45 consecutive days within such three-month period, do not
equal or exceed the Annual Sales Target for the following twelve months, then
MENTOR's exclusive marketing and distribution rights shall be subject to
termination by NAMS as provided by Section 5.6, below, if the conditions for
termination set forth in that Section have been met.

                        (b)  Should MENTOR elect to reject the NAMS's Marketing
Plan and to instead adopt and implement an alternative Marketing Plan developed
by MENTOR, then:

                             (i)   If during the three full calendar months
following the expiration of the Election Period, MENTOR's Product sales, when
computed on an annualized basis using MENTOR's highest level of Product sales
during a period of 45 consecutive days within such three-month period, equal or
exceed the Annual Sales Target for the then-current Sales Year, then MENTOR
shall not be obligated to take further remedial action for as long as its
Product sales, computed on an annualized basis, remain at a level sufficient to
maintain Target Market Share; but

                             (ii)  If during the three full calendar months
following the expiration of the Election Period, MENTOR's Product sales,
computed on an annualized basis utilizing MENTOR's highest level of Product
sales during a period of 45 consecutive days within such three-month period, do
not equal or exceed the Annual Sales Target for the then-current Sales Year,
then MENTOR's exclusive marketing and distribution rights shall be subject to
termination by NAMS as provided by Section 5.6, below, if the conditions for
termination set forth in that Section have been met.

          5.5.3    Objection by MENTOR.  If MENTOR objects to or contests the
accuracy of the information contained in a Deficiency Notice, then MENTOR shall,
within thirty (30) days after its

<PAGE>


receipt of such Deficiency Notice, provide NAMS with (1) MENTOR's opinion as to
the size of the market for the use of the Product in the Field of Use during the
specified Sales Year, and (2) appropriate, independent market data and research
in support of MENTOR's opinion.  If the parties are unable to resolve their
difference of opinion within thirty (30) days after the MENTOR's receipt of a
Deficiency Notice, then at the request of either party (the "Moving Party"), the
parties shall engage an independent market research firm ("an "Independent
Analyst") as provided by Section 5.5.4, below, to advise them as to the size of
the market for the Product for such purposes for the Geographic Market Area in
question.

          5.5.4    Independent Market Study.  Any Independent Analyst engaged
by the parties pursuant to this Section 5.5 shall be selected by the Moving
Party from a list of not less than three independent market research firms
provided by the other party.  There shall be included in such list only
recognized national market research firms that have not less than three offices
and a demonstrable record of having performed market studies for the Geographic
Market Area in question.

              A.   Each party shall be entitled to provide the Independent
Analyst with such information that such party believes to be relevant to a
determination of the size of the market for use of the Product in brachytherapy
procedures for the treatment of prostate cancer.  The opinion of any such
Independent Analyst engaged by the parties as provided herein shall be
conclusive and binding on both parties.

              B.   The parties shall pay in equal shares the costs and fees of
any Independent Analyst engaged pursuant to this Section 5.5, above, except that
(a) NAMS shall pay all such costs and fees if its opinion of the size of the
market exceeds the estimated market as determined by the Independent Analysis by
more than twenty percent (20%), (b) MENTOR shall pay all such costs and fees if
the Independent Analyst's estimate of the size of the market exceeds MENTOR's
opinion as to the size of the market by more than twenty percent (20%) and (c)
if both MENTOR's opinion of the size of the market and NAMS's opinion of the
size of the market differ by more than twenty percent (20%) from the estimated
market as determined by the Independent Analyst, then MENTOR and NAMS shall each
pay one-half of such costs and fees.

    5.6   TERMINATION OF EXCLUSIVE RIGHTS.  If it is determined through the
procedures set forth in this Section 5 that MENTOR has failed to achieve and
maintain the Target Market Share for the Product for any Geographic Market Area
for any Sales Year, then unless (a) the obligation of MENTOR to achieve such
Target Market share was abated pursuant to Section 5.4, above, or (b) MENTOR has
implemented successful remedial action as provided by Section 5.5, above, and
subject to the reinstatement rights conferred on MENTOR by Section 5.7, below,
NAMS shall be entitled to terminate the exclusive marketing and distribution
rights of MENTOR with respect

<PAGE>


to the Geographic Market Area in question by giving MENTOR thirty (30) days
written notice of its intention to do so (a "Termination Notice").  At the
election of NAMS, in its sole discretion, such rights may be converted to
non-exclusive rights with respect to such Geographic Market Area.

    5.7   REINSTATEMENT OF RIGHTS.  Notwithstanding the provisions of Section
5.6, above, MENTOR shall be entitled to retain its exclusive marketing and
distribution rights for the United States by remitting to NAMS within thirty
(30) days after its receipt of the Termination Notice the additional amount that
would have been paid to NAMS had MENTOR achieved its Target Market Share for the
United States by selling an additional quantity of the Product sufficient to
achieve the Target Market Share at an average Net Selling Price equal to the
average Net Selling Price for the Product sales actually made.  The Remedial
Period within which MENTOR must submit such payment shall be determined as
follows:

          5.7.1    If a Termination Notice is properly given to MENTOR with
respect to a completed Sales Year, the Remedial Period shall be a period of
sixty (60) days following MENTOR's receipt of the Termination Notice.

          5.7.2    If a Termination Notice is properly given to MENTOR prior to
the end of a current Sales Year, the Remedial Period shall be the greater of (a)
thirty days following the end of such Sales Year, or sixty (60) days following
its receipt of the Termination Notice.

    5.8   EXCLUSIVE REMEDY.  The right granted to NAMS to terminate the
exclusive marketing and distribution rights of MENTOR shall be the sole and
exclusive remedy for the failure of MENTOR to achieve the Annual Sales Target,
and in no event shall MENTOR be liable for damages or any other amount by reason
of its failure to achieve its Annual Sales Target or to attain its Target Market
Share.

    5.9   RIGHT OF MENTOR TO MANUFACTURE OR PURCHASE FROM OTHERS.  At any time
after the exclusive right of MENTOR to market and distribute the Product has
been terminated with respect to a designated Geographic Market Area pursuant to
Section 5.6, above, MENTOR shall be entitled to discontinue the purchase of its
requirements for the Product in such Geographic Market Area from NAMS, and to
begin manufacturing the radioactive sources itself or procuring its requirements
for radioactive sources from an alternative source as provided by Section 8,
below, provided that any Product so manufactured or procured is not distributed
in any Geographic Market Area other than the Geographic Market Areas for which
MENTOR's exclusive marketing and distribution rights have been terminated.

<PAGE>


6.  REQUIREMENTS AND SUPPLY

    6.1   REQUIREMENTS.  NAMS shall supply to the Customers of MENTOR and its
Affiliates each month the number of units of the Product for which MENTOR and
its Affiliates submit purchase orders pursuant to Section 6.7, below and,
subject to the ability of NAMS to satisfy its supply obligation,  MENTOR and its
Affiliates shall procure from NAMS all I-125 Sources required to satisfy the
needs of MENTOR's Customers.

    6.2   SPECIFICATIONS.  All Product supplied by NAMS hereunder shall in all
material respects meet the Product Specifications applicable to the Product when
intended for use in the Field of Use.  Simultaneously with the execution of this
Agreement, NAMS and MENTOR shall agree on the Product Specifications for the
Product and shall attach a Schedule setting forth such Specifications as Exhibit
A to this Agreement.  The Product Specifications shall constitute an integral
part of this Agreement and NAMS shall not make any changes to the Product
Specifications without giving MENTOR not less than sixty (60) days prior written
notice of the proposed change and, if MENTOR so requests, meeting with MENTOR to
explain the nature of and the reasons for such change.

    6.3   TRANSFER PRICES.  The transfer price payable by MENTOR for the
Product shall be the amount set forth on the Terms Sheet attached as Schedule 1
to this Agreement.

    6.4   SAMPLES AND PROMOTIONAL PRODUCT.  NAMS will provide MENTOR with
samples and promotional units of the Product for use as samples, physician demos
and similar promotional or educational purposes in the quantities, at the prices
and for the period set forth in the Terms Sheet attached as Schedule 1 to this
Agreement.

    6.5   DUTY TO MANUFACTURE.  NAMS shall establish and maintain sufficient
capacity necessary to satisfy MENTOR's Anticipated Requirements for the Product
during the first and second Sales Years and thereafter shall increase its
production capacity to the extent that the parties mutually agree or, in the
absence of an agreement to the contrary, to an amount sufficient to satisfy
MENTOR's  requirements if MENTOR's sales were to increase each year by the
percentage increase, if any, in its sales in the preceding year.

          6.5.1    Should NAMS be unable to fill MENTOR's Anticipated
Requirements on a timely basis, then at the request of either party appropriate
representatives of NAMS and MENTOR shall meet in order to review and analyze
NAMS's production capacity, projected Product sales, and Product order,
manufacture and shipment cycles, in order to develop and implement appropriate
remedies.

          6.5.2    NAMS shall exercise due diligence in

<PAGE>


expanding its production capacity to meet unanticipated increases in demand for
the Product consistent with the availability of capital and its other operating
requirements, and MENTOR shall not be entitled to terminate its obligation to
procure all of its requirements for the Product from NAMS except on the terms
and conditions set forth in Section 8, below.

    6.6   SALES FORECASTS.  MENTOR will provide NAMS on or before the fifteenth
(15th) day of each month a nonbinding rolling forecast of projected Product
sales for the each of the three (3) calendar months following the month in which
the forecast is prepared.

    6.7   PURCHASE ORDERS.  All purchase orders shall be submitted on forms
that are acceptable to NAMS not less than seven (7) days prior to the required
delivery date.  Each such purchase order shall specify by Customer name and
address (a) the number of units and activity level of the Product to be
delivered to such Customer, (b) the required delivery date, and (c) the Net
Selling Price payable by the Customer.  Notwithstanding the provisions of any
such purchase order, the provisions of this Agreement shall govern the purchase
and sale of the Product between NAMS and MENTOR, and any inconsistency or
conflict between the terms set forth in any form of purchase order submitted by
MENTOR with the provisions of this Agreement shall be resolved in favor of the
provisions of this Agreement.

    6.8   PACKAGING AND LABELLING.  The Product will be supplied in containers
meeting the Product Specifications, and will be packaged with all applicable
product literature and instructions for use in packaging which (a) satisfies all
Applicable Regulatory Requirements governing the handling, shipment and storage
of the Product and (b) is sufficient to protect against damage during shipping.

          6.8.1    Subject to any limitations imposed by the foregoing
requirements, the packaging design and trade dress for the Product shall conform
to MENTOR's specifications so as to assure that such design and trade dress are
consistent with the packaging of MENTOR's other products.

          6.8.2    NAMS shall include with the Product such instructions for
use and product information data sheets as may be reasonably requested by
MENTOR, and shall include in any Products shipped to Customers in kit form such
instructions for use and product information data sheets as may be supplied by
MENTOR for such purposes.

          6.8.3    All packaging, shipping labels, instructions for use and 
product information data sheets shall bear such of MENTOR's trademarks, 
labels and markings as MENTOR may reasonably request.  MENTOR shall provide 
NAMS with camera-ready art work for all trademarks, labels or markings that 
MENTOR desires to have imprinted on all packaging and product insert data 
sheets, and

<PAGE>


NAMS shall not make any changes in such art work or in the specifications for
such packaging materials without the prior written consent of MENTOR.

          6.8.4    NAMS shall be entitled (a) to display its trade name on the
Product packaging and Product information data sheets in a manner that (i)
clearly identifies the Product as having been manufactured by NAMS under patents
or licenses held by NAMS, and that (ii) gives the NAMS trade name equal
prominence with the MENTOR's trade name or the trademarks under which the
Products are distributed, and (b) to include its product literature and
advertising in the packaging.

    6.9   ORDER FULFILLMENT.  NAMS will timely fill all purchase orders
submitted by MENTOR, will make shipment of the Product directly to the Customer
identified in the purchase order within the time prescribed by Section 6.10,
below, and will afford all purchase orders for the Product received from MENTOR
equal priority with NAMS's own supply requirements and orders from other
distributors licensed to distribute the Product for use in other applications or
fields of use.  NAMS will ship all orders for the Product in the priority in
which such orders were received, regardless of the field of use to which such
orders relate, and NAMS will not place any purchase orders received from MENTOR
on a back-order status if NAMS is then shipping Product to its own customers or
to any other purchaser or distributor.

    6.10  SHIPPING AND INVOICING.  All Product shall be drop shipped by NAMS
directly to MENTOR's Customers FOB NAMS's manufacturing plant at a date and time
appropriate to ensure that the Product will be delivered to the Customer at the
address specified in the purchase order on the delivery date specified in the
purchase order.  Carriers and routing utilized to make such shipments shall be
selected by NAMS but shall be consistent with any shipping protocols or
procedures previously established by the parties.

    6.11  INVOICING.  NAMS shall invoice MENTOR, 30-days net, upon shipment of
the Product.  MENTOR shall be entitled to make partial or complete payment of
any such invoice by returning to NAMS for credit against its account any unused
credit memos previously issued by NAMS pursuant to this Agreement.

    6.12  PAYMENT.  Payment of the Fixed Price for all Product shipped to
Customers shall be made by MENTOR, whether or not MENTOR receives payment from
the Customer, it being agreed that MENTOR is the Customer for all Product
shipped by NAMS pursuant to purchase orders submitted to NAMS by MENTOR pursuant
to this Agreement.  MENTOR shall be responsible for all billings, receivables
and collections attributable to Product sales made pursuant to purchase orders
submitted to NAMS by MENTOR, and NAMS shall not be required to bear any of the
risk or cost of collection with respect to the Fixed Price of the Product.
Payment of that portion of transfer price which exceeds the Fixed Price shall be
made in accordance with the provisions of Section

<PAGE>


7.2.2, below.

    6.13  RISK OF LOSS.  Delivery of the Product by NAMS to MENTOR pursuant to
this Agreement shall be complete and the risk of loss shall pass to MENTOR upon
receipt by the carrier for shipment.

    6.14  STATEMENTS AND CREDIT MEMOS.  NAMS shall issue a monthly statement
within ten (10) days after the end of each month, reflecting all outstanding
invoices and any unused credits to which MENTOR is entitled under Section 6.18,
below.

          6.14.1   Each such statement shall be accompanied by a separate
credit memo reflecting any credit to which MENTOR has become entitled during the
preceding month.

          6.14.2   NAMS shall replace from time to time at the request of
MENTOR any credit memo that MENTOR reports as having been stolen, lost or
destroyed upon the presentation of appropriate evidence that such memo has not
been previously been returned to NAMS for credit.  The inability of MENTOR to
deliver a credit memo to NAMS due to its theft, loss or destruction shall not
excuse NAMS from its obligation to allow credits against invoices for any
previously unused credits to which MENTOR is entitled under this Agreement.

    6.15  PRODUCT WARRANTY.  NAMS warrants to MENTOR that:

          6.15.1   The Product to be supplied to MENTOR hereunder shall be
manufactured and produced:

              A.   In plants that have been registered with and are in
compliance with the requirements of the FDA; and

              B.   In accordance with: (1) applicable Good Manufacturing
Practices as promulgated by the FDA; and (2) applicable laws and regulations of
the United States and each of the fifty states in which MENTOR is marketing and
distributing the Products; and (3) all other Applicable Regulatory Requirements
which are made known to NAMS by MENTOR or of which NAMS could otherwise
reasonably be expected to be aware.

          6.15.2   If NAMS has obtained a CE Mark for the Product, then the
Products to be supplied to MENTOR and its Customers hereunder shall be
manufactured and produced (a) in plants that have been audited and certified by
the applicable Notified Body to satisfy the standards established by EN 46001
and 46002 and any other requirements promulgated by the European Commission for
manufacturing facilities for medical devices in order to qualify for the CE
Mark; and (b) in accordance with the standards established by the applicable
Medical Device Directive promulgated by the European Commission or the European
Council in order to qualify for a CE Mark.

          6.15.3   The use of the Product for its intended

<PAGE>


purpose in the Field of Use will not violate any Applicable Regulatory
Requirements in the United States and, with respect to other Geographic Market
Areas, Applicable Regulatory Requirements which are made known to NAMS by MENTOR
or of which NAMS could otherwise reasonably be expected to be aware.

          6.15.4   At the time of its delivery to the Customer, the Product
will: (a) conform to the then current Product Specifications; (b) be fit for its
intended purposes in the Field of Use; (c) be free of all liens, security
interests and encumbrances; (d) not be proscribed by federal or state law from
being introduced into interstate or intrastate commerce in the United States;
and (e) not be adulterated within the meaning of the Federal Food, Drug and
Cosmetic Act and regulations promulgated thereunder, nor within the meaning of
any substantially similar law of any state within the United States or any
Member State in the European Community.

    6.16  WARRANTY DISCLAIMERS.  EXCEPT AS EXPRESSLY PROVIDED IN SECTION 10.1,
BELOW, THE LIMITED WARRANTY SET FORTH IN SECTION 6.15, ABOVE, IS THE ONLY
WARRANTY BEING MADE BY NAMS WITH RESPECT TO THE PRODUCT.  ALL OTHER WARRANTIES,
WHETHER WRITTEN OR ORAL, EXPRESS OR IMPLIED, CONTRACTUAL OR STATUTORY, INCLUDING
BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR
PURPOSE ARE SPECIFICALLY EXCLUDED AND DISCLAIMED.

          6.16.1   MENTOR agrees and understands that it shall be solely
responsible for any warranties or representations made by it to its customers
which are inconsistent with or in addition to any warranties made by NAMS to the
ultimate purchasers and users of the Product, and MENTOR shall, at its own
expense, defend, indemnify and hold NAMS harmless from and against any claims
thereon of any nature whatsoever in the manner and to the extent provided by
Section 11.3, below (it being the intention of the parties that the indemnity
obligation contained in this Section 6.16.1 shall be subject to the terms and
conditions of Section 11.2, below, and that this Section not be construed to
increase MENTOR's indemnification obligation beyond the obligations set forth in
Section 11.3).

          6.16.2   The warranties given by NAMS pursuant to Section 6.15,
above, shall not apply to any components supplied by MENTOR for the purpose of
marketing the Product in kit form as contemplated by Section 7.1.9, below.

    6.17  NONCONFORMING GOODS AND DEFECTIVE PRODUCT.  MENTOR shall promptly
advise NAMS of any Product delivered to a Customer that has been or is being
rejected as Defective Product.  Any such notice (a) shall be in writing, (b)
shall specify (i) the original date of sale and (ii) the shipment or lots being
rejected, and (c) shall be accompanied by appropriate information substantiating
the claim that such Product was Defective.  The costs and expense of returning
Defective Product shall be borne by NAMS, but NAMS shall not be responsible for
the costs of Product believed to be

<PAGE>


Defective Product until it is determined that the Product was Defective Product,
and no Product shall be deemed to be Defective Product until NAMS has first been
afforded the opportunity to inspect the Product and to confirm that it was
Defective Product. NAMS shall be responsible for assuring that any Defective
Product  returned to NAMS by the Customer is disposed of in accordance with all
Applicable Regulatory Requirements governing the handling, shipment, storage and
disposal of the Product.

    6.18  REPLACEMENT.  NAMS shall promptly replace at its own cost and expense
any Defective Product that is returned to NAMS or, if MENTOR so requests, shall
credit to MENTOR on a monthly basis an amount equal to the Documented Cost of
any such returned Product, if such Product:

          6.18.1   Is Defective Product that has been properly returned by
MENTOR or any Customer of MENTOR.

          6.18.2   Has been replaced on a no-charge basis by MENTOR in
accordance with the established customer complaint and returned goods policies
of NAMS for the return and replacement of Defective Product.

    6.19  PRODUCT RECALLS.  NAMS shall bear all costs and expense incurred by
either of the parties on account of any recall of or any device notification or
safety alert given with respect to the Product, whether pursuant to a request of
the FDA or otherwise, including without limitation any expenses or obligations
to Third Parties and any costs associated with the shipment of recalled Product
from Customers to NAMS; provided, however, that the obligation of NAMS hereunder
shall not extend to any recall, notification or alert that is necessitated by an
act, error or omission of MENTOR.  MENTOR shall maintain complete and accurate
records for such periods as may be required by applicable law of all Product
sold by it.

    6.20  CUSTOMER COMPLAINTS.  MENTOR shall promptly refer to NAMS for review
and evaluation any complaints received by it that are subject to the provisions
of Part 820 of Title 21 of the Code of Federal Regulations (Good Manufacturing
Practice for Medical Devices).

          6.20.1   With respect both to complaints referred to NAMS by MENTOR
and complaints received directly by NAMS from Customers:

              A.   NAMS shall (1) give such notices, (2) conduct such
investigations, (3) maintain such records, and (4) take such other actions as in
each case are required by the FDA and any state regulatory agency having
jurisdiction with respect thereto unless NAMS is contesting the matter with the
FDA or other regulatory agency in good faith and with due diligence.

              B.   NAMS shall keep MENTOR advised on a continu-

<PAGE>


ing basis with respect to (1) the nature of such complaints, (2) the results of
any investigations conducted by it with respect thereto, and (3) the corrective
action, if any, initiated as a result of or in response thereto.  MENTOR shall
treat all such information received by NAMS as Confidential Information.

          6.20.2   MENTOR shall promptly refer to NAMS any complaints, demands
or notices delivered to or made upon MENTOR by or on behalf of a Customer or any
Third Party who is seeking damages or other compensation on account of any
injury, illness or death of a person or damage to property that is alleged to
have resulted from or to be attributable to the use of the Product, and NAMS
shall indemnify, defend and hold MENTOR free and harmless with respect to any
such claim or demand in the manner but only to the extent provided in Section
11.2, below (it being the intention of the parties that the indemnity obligation
contained in this Section 6.20.2 shall be subject to the terms and conditions of
Section 11.2, below, and that this Section not be construed to increase NAMS's
indemnification obligation beyond the obligations set forth in Section 11.2).

    6.21  COUNTRY OF ORIGIN.  At MENTOR's request, NAMS shall provide MENTOR
with a signed affidavit of the country of origin of any Product delivered to
MENTOR pursuant to this Agreement.

    6.22  SALES & USE TAXES.  As between MENTOR and NAMS, MENTOR shall be
responsible for the payment of all sales and use taxes becoming payable by
reason of its purchase of the Product from NAMS and the subsequent sale of the
Product to its Customers.

7.  ADDITIONAL COVENANTS OF THE PARTIES

    7.1   COVENANTS OF NAMS.  NAMS covenants, warrants and represents to MENTOR
that:

          7.1.1    FDA Marketing Approval.  NAMS shall exercise due diligence
in obtaining as soon as practicable after the execution of this Agreement and
thereafter maintaining in full force and effect throughout the term of this
Agreement all FDA Marketing Approvals necessary to the sale and distribution of
the Product for use in the Field of Use.

          7.1.2    Registration in European Community.  NAMS shall prepare at
its own cost all documents necessary to secure when first required and to
thereafter maintain in full force and effect a CE Mark for the sale and
distribution of the Product and any Improvements thereto for use in the Field of
Use in any of the Member States of the European Community.  Should NAMS fails to
secure a CE Mark for the Product prior to the date on which such Mark is first
required in order to lawfully sell the Product for use in the Field of Use in
the applicable Geographic Market Area, then the date by which MENTOR must attain
the Target Market share for such Geographic Market Area shall be postponed until
such CE Mark has been obtained and the term of this Agreement shall be

<PAGE>


extended for a like period of time.

          7.1.3    Compliance with Applicable Regulatory Requirements.  NAMS
shall at all times (a) keep and maintain all records necessary or appropriate to
evidence such compliance or that are otherwise mandated by the Applicable
Regulatory Requirements and the standards identified in Sections 6.15 and 7.1.2,
above, and (b) shall make such records available to MENTOR (subject to the
restrictions imposed by Section 7.3.6, below) and its duly authorized
representatives for inspection and copying at reasonable times during regular
business hours upon reasonable prior notice, and (c) shall promptly comply with
Applicable Regulatory Requirements of (i) any cognizant governmental authority
within the United States or any of the fifty states pertaining to the production
of the Products and (ii) the Applicable Regulatory Requirements adopted for the
European Community by the European Commission or the European Council, to the
extent necessary to procure and maintain in effect a CE Mark for the sale and
distribution of the Products and any Improvements thereto for use in the Field
of Use in any Member State of the European Union.

          7.1.4    Manufacture of Pd-103 Sources.  NAMS shall proceed with due
diligence in attempting to develop the technology, know-how and manufacturing
capacity to produce Pd-103 Sources.
              A.   NAMS shall provide the first $250,000 of the capital
required to fund the costs required to create the manufacturing capacity
necessary to produce the Pd-103 Sources.  If the costs of creating the necessary
manufacturing capacity for Pd-103 Sources exceed $250,000, then NAMS shall first
offer MENTOR the opportunity to supply any additional required capital in excess
of $250,000 and to acquire exclusive marketing and distribution rights for such
Pd-103 Sources on substantially the same terms and conditions of this Agreement.

              B.   If after sixty (60) days from the date on which NAMS first
makes a written proposal to MENTOR, NAMS and MENTOR are unable to agree on the
terms and conditions on which such additional required capital is to be
supplied, then NAMS shall be entitled to seek such additional required capital
from a Thirty Party, but in no event shall NAMS accept any such additional
required capital on terms and conditions that are more favorable to such Third
Party than the terms and conditions offered by NAMS to MENTOR, or on terms and
conditions less favorable to NAMS than the terms and conditions offered to NAMS
by MENTOR, without NAMS having first presented such terms and conditions to
MENTOR and affording MENTOR a period of ten (10) business days within which to
agree to supply such additional required capital on the same terms and
conditions as were proposed by such Third Party.

              C.   Should NAMS be unable to supply Pd-103 Sources to MENTOR in
commercially reasonable quantities within

<PAGE>


three years after the Effective Date of this Agreement, then MENTOR shall be
entitled to obtain Pd-103 Sources from any other available source.

          7.1.5    Covenant by NAMS not to Compete.  Unless and until MENTOR's
exclusive marketing and distribution rights are terminated pursuant to Section
5, above:

              A.   Neither NAMS nor any of its Affiliates shall market or
distribute the Product for use in the Field of Use in violation of the exclusive
marketing and distribution rights granted to MENTOR under this Agreement, and
NAMS shall not (a) license any other Person to market or distribute the Product
for use in the Field of Use, or (b) knowingly or intentionally suffer or permit
any Person to sell the Product for use in the Field of Use; and

              B.   NAMS shall promptly refer to MENTOR for processing all
purchase orders or inquiries received by NAMS directly from Customers or
prospective purchasers of the Product, and NAMS shall not act upon or fill any
such purchase order that has not been processed and submitted to NAMS by MENTOR.

          7.1.6    Marketing Support.  NAMS shall from time to time provide
such scientific and technical information regarding the Product and its clinical
performance as MENTOR may reasonably request for the purpose of supporting
MENTOR's clinical study and marketing activities, including such information as
may be necessary to assist MENTOR in marketing the Product in kit form.  In
addition, NAMS shall make its technical and marketing personnel available to
MENTOR for reasonable periods of time to provide technical support, to respond
to technical inquiries, and to participate in marketing and sales strategy
sessions.

          7.1.7    Manufacturing Modifications.  NAMS shall give MENTOR not
less than sixty (60) days' prior written notice (or such lesser period of time
as may be reasonable under the circumstances) of any modifications proposed to
made by NAMS or its suppliers to the manufacturing processes or procedures for
the Product or to any quality control test and/or compliance procedures relating
to the Product or the supplies and components embodied therein, whether
resulting from governmental inspection, customer complaints or for any other
reason, if any such modification will (a) cause a change in the Product
Specifications or (b) cause the Product or the procedure for its manufacture to
differ in any material respect from the information contained in NAMS's
application for 510(K) approval of the Product by the FDA.  Such notice shall be
accompanied by a written report setting forth in reasonable detail the reasons
for and the nature of the proposed change and all relevant technical data and,
if MENTOR so requests, NAMS shall meet with MENTOR to explain the nature of and
the reasons for such change.

          7.1.8    Product Improvements.  NAMS shall (a) take

<PAGE>


reasonable steps, including the maintenance and funding of continuing materials
and product research and development, to make such Improvements to the Product
as may be necessary to meet the needs of the market and to keep the Product
current and commercially acceptable, (b) shall consult with MENTOR regarding
proposed changes to the Product, and (c) shall endeavor to incorporate into the
Product any reasonable features or Improvements that are recommended by MENTOR
as the result of its clinical studies and its marketing and Customer support
activities, including such modifications or additions as MENTOR may reasonably
request for the purpose of marketing and distributing the Product in kit form.

          7.1.9    Marketing of Product in Kit Form.  MENTOR shall have the
right to (a) combine or assemble the Product with other devices or products for
the purpose of marketing and distributing the Product in kit form, including
pre-loading Radioactive Sources into needles and arrays, and (b) to market and
sell Ancillary Products and kits that do not include Radioactive Sources or any
other components manufactured or supplied by NAMS.

              A.   Any proprietary technology or Improvements developed or
acquired by MENTOR for the purpose of marketing the Product in kit form (but
excluding Technology that is embodied in or is related to the manufacture and
production of the Radioactive Sources) shall be and remain the intellectual
property of MENTOR, but NAMS shall have a non-exclusive, royalty-free license in
any such proprietary technology or Improvements to the extent necessary to
satisfy and discharge its obligations to MENTOR under this Agreement.

              B.   Should any such kits include additional devices, products or
service to be supplied by NAMS, then NAMS shall supply such devices, products
and service on the terms and conditions set forth in Section 6, above, at a
transfer price determined in accordance with paragraph 3 of the Terms Sheet
attached as Schedule 1 to this Agreement, but nothing herein shall be construed
to require MENTOR to procure such devices or materials from NAMS.

              C.   Except as provided in subparagraph B, above, NAMS shall not
be entitled to any increase in the transfer price for the Product by reason of
(a) its being packaged and marketed in kit form or (b) any increase in the
selling price attributable to the value added by MENTOR by packaging the Product
in kit form, it being intended that the transfer price for the Product will
remain constant, regardless of the manner in which it is marketed and
distributed by MENTOR.

          7.1.10   Governmental Inspections.  NAMS shall promptly notify MENTOR
of any inspection made of its facilities or its operations by any regulatory
agency or Notified Body, or of those of any of its suppliers or contract
manufacturers of which it receives notice, that relates in any manner to the
production,

<PAGE>


distribution or use of the Product or any component of the Product.  NAMS shall
promptly advise MENTOR of the conduct of any such inspection and the results
thereof, and shall provide MENTOR with a copy of any written notification or
report provided  to NAMS by the inspecting agency.  In addition, NAMS shall
immediately request an unexpurgated copy of the inspection report from the
inspecting governmental agency, and, unless prohibited from doing so under
applicable law, shall forward a copy thereof to MENTOR immediately upon its
receipt.

          7.1.11   Labelling Claims.  NAMS shall provide MENTOR with prior
written notice of any labelling claims for which NAMS intends to seek FDA
approval, and shall endeavor to include in its applications for FDA approval
such labelling claims as MENTOR may reasonably request.

          7.1.12   Vendor's Audit.  NAMS shall permit MENTOR or its authorized
representatives to enter and inspect, during normal business hours, the plants
and facilities in which the Product is manufactured, packaged, labeled or held
in order to permit MENTOR to verify that the Product is being produced in
conformity with applicable Good Manufacturing Practices and the applicable
Medical Device Directive of the European Commission, and that NAMS is otherwise
satisfying its obligations under this Agreement.

              A.   During any such inspection, MENTOR's quality control or
compliance inspectors shall be entitled to inspect the manufacturing and quality
control procedures of NAMS relating to the Product, and all records relating
thereto, but:

                   (1)  MENTOR's access to those portions of NAMS's
manufacturing and quality control procedures that NAMS has designated as
proprietary to NAMS shall be limited to the degree of access required in order
to satisfy the applicable requirements of the FDA; and

                   (2)  All such inspections shall be carried out in a manner
that does not unreasonably interfere with NAMS's manufacturing operations.

              B.   MENTOR's employees and agents shall be required to execute
NAMS's standard form confidentiality and non-disclosure agreement as a condition
to being allowed to conduct such audit.

              C.   MENTOR shall not perform an audit more than once in any
Sales Year unless necessary to satisfy Applicable Regulatory Requirements to
which MENTOR is subject.  MENTOR shall give NAMS prior notice of its intention
to conduct any such audit at least five (5) business days prior to the scheduled
commencement thereof, and shall cooperate with NAMS in the scheduling of any
such audit so as to minimize to the extent practicable any disruption to NAMS's
business operations, but MENTOR shall not be obligated to postpone the conduct
of such

<PAGE>


audit for more than fifteen (15) days.

              D.   MENTOR shall furnish NAMS with a written report of the
results of any such audit as soon as practicable after its completion, and NAMS
shall promptly take any action suggested or recommended in such report to the
extent that such action is necessary to cure a default by NAMS in the
performance of its obligations under this Agreement.

          7.1.13   Covenants if MENTOR's Rights Become Nonexclusive. If at any
time the distribution rights held by MENTOR have become nonexclusive rights,
then all terms and conditions of this Agreement that are not rendered
inapplicable by the change in the nature of the rights held by MENTOR shall
continue in full force and effect and, in addition:

              A.   The transfer price charged to MENTOR shall not exceed the
most favorable transfer price charged by NAMS to any other distributor of the
Product for use in the Field of Use.

              B.   For as long as this Agreement remains in effect, NAMS shall
not enter into agreements for the marketing and distribution of the Product for
use in the Field of Use with any other person or entity on terms and conditions
that are more favorable than the terms and conditions of this Agreement without
giving to MENTOR the benefit thereof as of the date upon which any such more
favorable agreement becomes effective.  Should NAMS enter into any such more
favorable agreement, it will promptly notify MENTOR to that effect and advise
MENTOR concerning the change in the terms and conditions affecting this
Agreement and the provision made by NAMS to effectuate such changes.

              C.   NAMS will timely fill all purchase orders submitted by
MENTOR, and will afford all purchase orders for the Product received from MENTOR
equal priority with NAMS's own supply requirements and orders from other
distributors licensed to distribute the Product.  NAMS will ship all orders for
the Product in the priority in which such orders were received, and NAMS will
not place any purchase orders received from MENTOR or procured by MENTOR from a
Customer on a back-order status if NAMS is then shipping Product to its own
Customers or to any other purchaser or distributor.

    7.2   COVENANTS OF MENTOR.  MENTOR covenants to and agrees with NAMS that:

          7.2.1    Sales Capacity.  MENTOR shall train, equip and maintain
sufficient staff to effectively promote, sell and distribute the Product, and
shall use due diligence in developing and implementing a Marketing Plan pursuant
to the Marketing Plan Overview attached as Exhibit B to this Agreement, as it
may be amended by the parties from time to time, in order to maximize sales of
the Product, but nothing herein shall be construed to make MENTOR liable for any
failure or alleged failure to purchase

<PAGE>


or sell the Product, it being understood that the failure of MENTOR to achieve
its Target Market Share for a specific Geographic Market Area shall not
constitute a default under this Agreement and shall only entitle NAMS to
terminate MENTOR's exclusive marketing and distribution rights as provided by
Section 5 of this Agreement.

          7.2.2    Overage Reports and Payments.  MENTOR shall deliver to NAMS
within thirty (30) days after the end of each calendar quarter an Overage Report
setting forth the following information for each Reporting Period, itemized by
Product Line for all Customers to whom Product sales have been made for which
Overage Payments are or may become due, but excluding Customers for whom MENTOR
and NAMS have made a separate written pricing arrangement excluding such
Customer from the computation of Overage Payments: (a) the number of units of
Product sold by MENTOR or any of its Affiliates to such Customers; (b) the Net
Selling Price payable to NAMS and its Affiliates with respect to such Product
sales; (d) the amount of the Net Selling Price actually paid to and received by
MENTOR; (c) the Overage Payment payable to NAMS with respect to such sales,
together with a clear computation of the amount thereof; (d) Overage Payments
actually paid with respect to such sales; and (e) Overage Payments that are not
yet due and payable.  Each such report shall be accompanied by the payment of
any Overage Payments owing to NAMS under this Agreement, to the extent not
previously paid.

          7.2.3    Covenant not to Manufacture or Sell Competing Products.
Provided that NAMS is not in default in the performance of its obligations
hereunder, then for as long as MENTOR holds exclusive marketing and distribution
rights under this Agreement, MENTOR shall not (a) manufacture or procure its
requirements for I-125 Sources for use in the Field of Use from any other source
without the prior written consent of NAMS, or (b) manufacture or procure its
requirements for Pd-103 Sources for use in the Field of Use from any other
source except in accordance with Section 7.1.4 of this Agreement.  NAMS
understands that MENTOR is and shall remain in the business of developing,
manufacturing and distributing devices for use in the treatment of urological
and other medical disorders, and nothing in this Agreement is intended and no
provision of this Agreement shall be construed to limit the right of MENTOR to
continue to develop, manufacture and sell (a) Ancillary Products for use in the
Field of Use and (b) radioactive sources for use outside the Field of Use.

          7.2.4    Covenant by MENTOR to Observe Restrictions.  Neither MENTOR
nor any of its Affiliates shall market or distribute the Product for any use
other than applications in the Field of Use, and MENTOR will not knowingly or
intentionally suffer or permit any Person purchasing the Product from MENTOR or
its Affiliates to resell the Product for use in any application other than the
Field of Use without the prior written approval of NAMS.

<PAGE>


          7.2.5    Labelling and Warranty Claims.  MENTOR shall not make any
express warranties or other claims with respect to the Product that have not
been authorized by the FDA or NAMS or that are inconsistent with any labelling
claims that have been approved by the FDA and NAMS with respect to the Product.

          7.2.6    Foreign Registration.  MENTOR shall inform NAMS in writing
of any Applicable Regulatory Requirements that are unique to a foreign country
into which MENTOR elects to begin marketing and distribution activities and that
must be satisfied as a condition to MENTOR'S obtaining any necessary permits,
licenses or Product registrations required for the distribution of the Product
in such country.  Subject to the performance by NAMS of its obligations under
Section 7.1.2, above, MENTOR shall prepare at its own cost and expense all
documents necessary for registration, sale and distribution of the Product and
any Improvements thereto for use in the Field of Use, and shall secure and
maintain in full force and effect all other permits, licenses and approvals
required in order to sell the Product for use in the Field of Use in such
foreign countries.

          7.2.7    Compliance with Applicable Regulatory Requirements.   MENTOR
shall comply with all Applicable Regulatory Requirements in its promotion and
sale of the Product, including the Applicable Regulatory Requirements of any
foreign jurisdiction in which it distributes the Product.

          7.2.8    Delivery of Clinical Data.  MENTOR shall from time to time
at the request of NAMS provide NAMS with such scientific and technical
information regarding the Product and its clinical performance as becomes
available to MENTOR by reason of any clinical trials conducted by MENTOR.

    7.3   MUTUAL WARRANTIES AND COVENANTS.  Each of the parties (herein, a
"warranting party") covenants to and agrees with the other that:

          7.3.1    Authority to Conduct Business.  It is duly organized and in
good standing under the laws of the jurisdiction in which it is incorporated and
has all requisite corporate power and authority and the permits, consents, and
qualifications necessary to operate its business as it is currently being
conducted.

          7.3.2    Authority to Perform Agreement.  The execution, delivery and
performance of this Agreement has been duly authorized by all necessary
corporate action, and does not constitute a breach by the warranting party of
its organizational documents or of any contract or agreement to which the
warranting party is a party or by which the warranting party or it assets are
bound.

          7.3.3    Exchange of Information.  It shall promptly furnish to the
other party a complete and correct copy of any

<PAGE>


notice, report or other communication that it receives from the FDA or from any
other governmental agency concerning the Product.

          7.3.4    Impairment of Obligation.  Neither party has entered and
will not hereafter enter into any agreement, the execution or performance of
which would violate this Agreement or have an adverse effect upon its ability to
perform this Agreement.

          7.3.5    Adverse Information.  Each party will promptly notify the
other party in writing of any fact, condition or information which may hereafter
come to its attention and which may adversely affect the reliability, utility or
marketability of the Product, including but not limited to, adverse scientific
or technical studies or evaluations and threatened litigation or claims.  If
such adverse information requires that corrective or protective action be taken
related to the Product, including, but not limited to, a recall, market
withdrawal, stock recovery or label clarification, the recipient of such
information will immediately notify the other of such requirement in writing,
provide the other party with complete copies of all documentation related
thereto, and provide all commercially reasonable assistance to the other party
necessary to assure that such actions are taken or such requirements are
satisfied.

          7.3.6    Confidential Information.   All information communicated by
each party to the other pursuant to this Agreement, including any Confidential
Information gained by either of the parties or their representatives by reason
of association with the other party in connection with the performance of any
obligations under this Agreement, whether or not such Confidential Information
was directly or intentionally communicated, is and shall at all times remain
confidential.

              A.   Each of the parties agrees that:

                   (1)  It shall not disclose any information or other material
which is deemed confidential pursuant to this Agreement to any other person
unless specifically authorized in writing by the other party to do so.  In the
event that any such written authorization to make disclosure is given,
disclosure shall be made only within the limits and to the extent of such of
authorization.

                   (2)  It shall use its best efforts to prevent any
inadvertent disclosure of any information deemed confidential hereunder to any
Third Party by using at least the same care and/or discretion that it uses with
similar data of its own that it deems confidential in the operation of its
business.

              B.   For purposes of this Section 7.3.6, the disclosure of
confidential information to employees and agents of a party to this agreement
shall not be deemed to be disclosure to a Third Party provided that the
disclosure is made for purposes related to the performance by such party of its
duties and

<PAGE>


obligations under this Agreement.

          7.3.7     Books and Records.  Each party shall at all times during
the continuance of this Agreement keep books and records in sufficient detail to
permit verification of its compliance with the terms and conditions of this
Agreement.  All such books and records shall be available for inspection and
copying by the other party or its designated representative at the principal
place of business of the party keeping such books and records at reasonable
times during regular business hours for purposes reasonably related to this
Agreement.

          7.3.8    Further Assurances.  Each of the parties shall take such
acts and execute and deliver such documents and instruments as may reasonably be
requested by the other party to enable the other party to perfect any of its
rights under this Agreement, including any assignments, notices of assignment,
or other registrations with applicable domestic and foreign governmental
agencies.

8.  MANUFACTURING RIGHTS; ALTERNATIVE SUPPLY SOURCES

    8.1   RIGHT TO MANUFACTURE.  MENTOR shall be released of its obligation
under Section 7.2.3, above, and shall be entitled (either itself or through
Affiliates or Third Parties) to manufacture the Product, or to have it
manufactured by a Third Party for purchase by MENTOR and Affiliates of MENTOR,
by giving not less than ten (10) days prior written notice of its intention to
do so:

          8.1.1    If NAMS discontinues the manufacture of the Product; or

          8.1.2    If (a) during any period of twenty-four (24) consecutive
months there are more than two occasions in which NAMS is unable to supply at
least ninety percent (90%) of MENTOR's requirements, as forecasted by MENTOR
pursuant to Section 6.6, above, during a period of ninety (90) consecutive days,
and (b) NAMS fails to successfully implement appropriate corrective action to
prevent a recurrence of NAMS's inability to supply sufficient Product to satisfy
MENTOR's requirements during the ensuing two years; or

          8.1.3    If MENTOR terminates this Agreement due to the occurrence of
a material event of default by NAMS that is not cured by NAMS within the
applicable cure period; or

          8.1.4    If MENTOR's exclusive marketing and distribution rights have
been terminated as to a designated Geographic Market Area pursuant to Section
5.6, above; provided however, that:

              A.   If NAMS elects to and in fact continues to supply the
Product to MENTOR for marketing and distribution in such Geographic Market Area
on a non-exclusive basis pursuant to Section 7.1.13, above, then for a period of
two years following the

<PAGE>


loss of its exclusive marketing and distribution rights for such Geographic
Market Are, MENTOR (a) shall continue to purchase the Product from NAMS for
distribution in such Geographic Market Area and (b) shall not manufacture the
Product for distribution in such Area; and

              B.   Any Product manufactured by MENTOR or procured by MENTOR
from a Third Party may be marketed and distributed only in those Geographic
Market Areas for which MENTOR's exclusive marketing and distribution rights have
been terminated); or

          8.1.5    NAMS becomes Insolvent.

    8.2   TRANSITION PROCEDURES.  If MENTOR becomes entitled and elects to
begin manufacturing the Product, then unless such election is made pursuant to
Section 5.9 of this Agreement due to the conversion of its exclusive marketing
and distribution rights to nonexclusive rights, upon the request of MENTOR NAMS
shall provide such cooperation and assistance as may reasonably be necessary to
enable MENTOR to design, engineer, manufacture, inspect and service the Product,
and shall consult with and advise MENTOR with respect to proper plant layout and
the selection of appropriate machinery, tools, equipment, and production flow
necessary for the manufacture of the Product on a cost-effective basis.  MENTOR
shall reimburse NAMS, immediately against invoice therefor, any and all direct
costs or expenses, including prorated salary, overhead and benefits for NAMS
personnel, as such costs and expenses are incurred by NAMS in providing such
cooperation and assistance.

          8.2.1    If the commencement of manufacturing operations by MENTOR is
attributable to any reason other than the occurrence of an uncured event of
default by NAMS, then at the request of NAMS the parties shall establish and
implement mutually agreeable transition procedures to ensure the purchase by
MENTOR of any inventory previously procured or produced by NAMS to fulfill
purchase orders previously submitted by MENTOR pursuant to this Agreement
(including any inventory or components MENTOR has authorized NAMS in writing to
acquire in order to assure their availability to satisfy MENTOR's forecasted
requirements).

          8.2.2    If the commencement of manufacturing operations by MENTOR is
attributable to the occurrence of an event of Force Majeure over which NAMS had
no control, and if NAMS restores its ability to manufacture and supply the
Product within six (6) months after the date on which its manufacturing
operations were disrupted, then MENTOR shall be obligated to resume purchasing
its requirements for the Product from NAMS.

    8.3   RIGHT TO PROCURE FROM ALTERNATIVE SOURCES.  Should NAMS be unable to
supply all of the requirements of MENTOR and its Affiliates for the Product
within the periods of time specified by this Agreement, then MENTOR shall be
entitled to purchase from

<PAGE>


alternative sources sufficient quantities of the Product to satisfy that portion
of its requirements that NAMS is unable to supply, but MENTOR shall be obligated
to continue to purchase so much of its requirements for the Product as NAMS is
able to supply unless and until MENTOR terminates this Agreement by reason of an
uncured material default by NAMS in the performance of its obligations under
this Agreement.

9.  TRADE NAMES AND TRADEMARKS

    9.1   MARKS OF NAMS.   The provisions of this Agreement permitting or
requiring MENTOR to place NAMS'S name and Marks on the Product and its packaging
are not intended and shall not be construed to give MENTOR any interest or
license in any such trademarks, trade names, labels or markings.  MENTOR shall
not make any use of NAMS's name or any trade name or trademark owned by NAMS
except for the purpose of marketing and selling the Product in accordance with
the provisions of this Agreement.

    9.2   MARKS OF MENTOR.   MENTOR shall be entitled to register and use its
own tradenames and trademarks  for the purpose of marketing and distributing the
Product for uses within the Field of Use.  Any such names and marks shall
constitute the proprietary property of MENTOR; NAMS shall not have any rights in
any such names and marks, and MENTOR shall be entitled to continue to use such
names and marks after the expiration of MENTOR's exclusive distribution rights
under this Agreement.  The provisions of this Agreement permitting or requiring
NAMS to place MENTOR's name and Marks on the Product and its packaging are not
intended and shall not be construed to give NAMS any interest or license in any
such trademarks, trade names, labels or markings.  Any uses by NAMS in its
advertising or elsewhere of MENTOR's name or any trade name or trademark owned
by MENTOR, or any name or mark similar thereto, shall be subject to the prior
written approval of MENTOR in its sole discretion and shall be governed by a
separate written agreement.

10. INFRINGEMENT CLAIMS

    10.1  WARRANTIES OF NAMS.  NAMS warrants and represents to MENTOR that:

          10.1.1   NAMS is the owner of and, to the best of its knowledge, has
good and uncontested title to all of the intellectual property rights utilized
to manufacture and produce the Product, free of any liens or claims by Third
Parties.  NAMS  has full power and authority to enter into this Agreement
without the approval or consent of any other Person.  NAMS has not granted any
other person the right to market or distribute the Product for use in the Field
of Use.

          10.1.2   To the best of its knowledge and after having conducted a
reasonable investigation, the formulation, manufacture (including but not
limited to the process and materials used to

<PAGE>


produce the Product), sale or use of the Product as it exists on the Effective
Date of this Agreement does not infringe any intellectual property rights of any
Third Party including, without limitation, any now existing patents.

          10.1.3        In the performance of this Agreement, NAMS will not
knowingly or willfully infringe any intellectual property rights of any Third
Party including, without limitation, any now existing or subsequently issued
patents.

          10.1.4   NAMS has no knowledge of any claims, disputes, or litigation
proceedings pending or threatened as of the Effective Date with respect to the
Product or the Technology or know-how used by NAMS in its manufacture, other
than certain proceedings with Best Industries previously disclosed to MENTOR.

    10.2  CLAIMS AGAINST THIRD PARTIES.  Should any actual or possible
infringement or other violation by any Third Party of any Technology or other
proprietary rights owned by NAMS come to the attention of either party to this
Agreement, such party shall promptly notify the other party of the alleged
infringement or violation.  The parties hereto shall consult with one another
with a view to reaching agreement as to the best means of eliminating the
infringement or violation.

          10.2.1   Discretionary Litigation.  Should NAMS elect or agree to
commence litigation or other enforcement action or proceedings, then MENTOR
shall be entitled to elect to pay its Proportionate Share of the costs and
expense thereof and to receive its Proportionate Share of any net recovery
resulting therefrom provided that MENTOR has a material interest in such
proceedings or any potential recovery resulting therefrom.  If MENTOR is not
entitled or elects not to participate in any such action or proceeding, then
NAMS shall bear the entire cost and expense thereof, and shall be entitled to
retain the entirety of any resulting recovery.

          10.2.2    Duty to Cooperate.  If NAMS elects to initiate litigation
or other action or proceeding on account of an alleged infringement of any
Technology owned by NAMS, and MENTOR  elects not to participate in the costs and
expense of prosecuting such action or proceeding, MENTOR  shall nonetheless
cooperate with NAMS in the prosecution of such action or proceeding provided
satisfactory provisions have been made for the reimbursement by NAMS of all
costs and expenses that MENTOR reasonably incurs in doing so.

    10.3  CLAIMS BY THIRD PARTIES.  In the event of any threatened or actual
suits against MENTOR by reason of its distribution and sale of the Product or
the exercise by MENTOR of any license granted to MENTOR hereunder based on an
allegation that the Product or the use of the Technology infringes on the
intellectual property rights of a Third Party, MENTOR shall promptly inform NAMS
and the parties shall jointly decide on steps to be taken

<PAGE>


under the circumstances.  If the parties are unable to agree on a mutually
acceptable course of action with respect to the defense of any such claim within
sixty (60) days after it is first brought to the attention of NAMS, then:

          10.3.1   NAMS shall be responsible for the defense of such action,
including the defense of MENTOR with counsel reasonably acceptable to MENTOR,
and shall bear the cost and expense thereof, but MENTOR, at its election, shall
be entitled to be represented in any such proceeding by independent counsel of
its choosing at its own cost and expense.

          10.3.2   NAMS shall indemnify and hold MENTOR harmless with respect
to any amounts becoming payable as damages to the claimant by reason of past
infringement attributable to the sale of the Product or the use of any
Technology owned by NAMS on the rights of the claimant.

          10.3.3   If the settlement or satisfaction of any such infringement
claim requires the payment by MENTOR to any Third Party of damages or royalties
on account of the sale or distribution of the Product, then MENTOR shall be
entitled to deduct any such amounts paid to any such Third Party from any
amounts thereafter becoming payable to NAMS under this Agreement.

    10.4  OBLIGATION TO MAKE PAYMENTS.  Except as otherwise expressly provided
by this Section 10, threatened or actual claims of infringement made against
MENTOR by a Third Party, or possible or actual infringement claims asserted by
NAMS or MENTOR against Third Parties, shall not excuse the obligation of MENTOR
to continue to pay the transfer price for any Product being purchased from NAMS,
but any such threat or claim shall constitute an Involuntary Business Disruption
during:

          10.4.1   Any period during which the sale of the Product is
restrained by an injunction or a temporary restraining order; and

          10.4.2   During the pendency of any action or proceeding in which
damages are sought from NAMS or any of its distributors on account of the
alleged infringement of the intellectual property rights of a Third Party by
reason of the sale of the Product or the use of the Technology, unless NAMS
establishes an escrow arrangement, posts a surety bond, or otherwise provides
reasonable security for the performance of its indemnification obligations under
this Agreement in an amount sufficient to protect MENTOR from any damage or loss
that would result if MENTOR were to continue to market and distribute the
Product during the pendency of any such action or proceeding and the claims were
resolved adversely to NAMS.

<PAGE>


11.  INSURANCE, INDEMNIFICATION AND LIMITATIONS ON LIABILITY

    11.1  NAMS'S LIABILITY INSURANCE.  Beginning on the Term Commencement Date
and continuing for a period of five (5) years from the date on which the last
sale of a Product occurs, NAMS shall maintain (a) product liability insurance
(containing both a Vendor's Additional Insured Endorsement and a Products
Contractual Liability Endorsement) on the Product in amounts that are consistent
with the amount of products liability insurance that are maintained by similarly
situated companies selling comparable products for similar or related purposes,
but in no event less than One Million Dollars ($1,000,000) first dollar coverage
per occurrence and Five Million Dollars ($5,000,000) in the aggregate; and (b)
general business liability insurance with minimum limits of One Million Dollars
($1,000,000) first dollar coverage per occurrence and Five Million Dollars
($5,000,000) in the aggregate.  MENTOR shall be named as an additional insured
in each policy of insurance required to be maintained by NAMS hereunder.

          11.1.1   The issuer of each such policy shall be a standard company
licensed to issue insurance having a Best's rating of B+ or higher and a policy
holder surplus of not less than Twenty-Five Million Dollars ($25,000,000).  Each
such policy shall provide for (a) the issuance of a reporting or tail coverage
endorsement upon termination of (i) the base policy, (ii) the production,
manufacturing, marketing and sale of the Product or (iii) the corporate
existence of NAMS and (b) for not less than thirty (30) days' prior written
notice to MENTOR of any proposed change in the nature, scope or amount of
coverage.  NAMS shall provide MENTOR with certificates of such insurance and
evidence of the payment of premiums therefor, promptly upon request.

          11.1.2   The insurance coverage required to be maintained hereunder
shall be subject to review and adjustment from time to the time at the request
of either party to limits of liability that are mutually agreeable in order to
assure a continuing level of insurance protection that, as nearly as practicable
after taking relative costs and benefits into account, is consistent with the
level of protection contemplated by the parties at the time they execute this
Agreement, but no such adjustment shall be made more than once in any
consecutive twelve-month period.  Should the parties be unable to agree with
respect to the nature or amount of such insurance coverage, then the dispute
shall be resolved by an independent insurance consultant who has not previously
performed services for either party.  If the parties cannot agree on any such
independent consultant, then such consultant shall be selected by the President
of the Independent Insurance Brokers Association in Los Angeles, California.

    11.2  INDEMNIFICATION BY NAMS.  NAMS shall promptly indemnify, defend and
hold MENTOR (including its officers, directors, employees, and agents) harmless
from and against any and all

<PAGE>


claims by Third Parties (whether based in contract or tort or otherwise arising
by operation of law), losses, damages, penalties, expenses, settlements, or
attorneys' fees arising out of or resulting from (i) any breach of a
representation or warranty or failure to perform any covenant or obligation of
NAMS under this Agreement; and (ii) any written representations or warranties
made by NAMS regarding the Product.  NAMS's contractual obligations to
indemnify, defend and hold MENTOR harmless shall extend to all such third-party
allegations or claims except to the extent that such allegations or claims have
been established by a court of competent jurisdiction or other dispute
resolution tribunal (including an arbitration panel) to have resulted from or to
be attributable to the fault or neglect of MENTOR.

          11.2.1   Limitation on NAMS's Obligation.  In any action or
proceeding in which liability for personal injury resulting from the use of the
Product is alleged to exist both against NAMS and MENTOR based in whole or in
part upon theories of negligent design, negligent manufacturing, failure to
warn, defective product, product liability, strict liability or any other theory
of liability directly related to the Product.

              A.   If MENTOR so requests, NAMS shall be obligated by this
Section 11.2 to defend MENTOR, notwithstanding that allegations are also made
that MENTOR (a) breached a written representation or warranty given by MENTOR
under this Agreement or to its Customers, or (b) was negligent in connection
with its marketing and distribution of the Product, unless NAMS elects to name
MENTOR as a cross-defendant in such action or proceeding.

                   (1)  If NAMS elects to name MENTOR as a cross-defendant in
any such action or proceeding, then each party shall provide its own defense,
and each party shall be entitled to be indemnified by the other with respect to
any damages, costs or expense established by a court of competent jurisdiction
or other dispute resolution tribunal (including an arbitration panel) to have
resulted from or to be attributable to the fault or neglect of the other party.

                   (2)  If allegations are made against MENTOR in any such
action or proceeding and (i) NAMS does not name MENTOR as a cross-defendant
therein, and (ii) MENTOR declines to provide its own defense with respect
thereto, and (iii) MENTOR subsequently acknowledges, or it is determined, that
MENTOR is liable by reason of the facts set forth in such allegations, then, in
addition to its indemnification obligation with respect to those damages for
which it is determined to be liable, MENTOR shall also be liable to NAMS for
that portion of the costs and fees incurred by NAMS in defending such action or
proceeding that is equal to MENTOR's percentage of liability for the damages
awarded in any such action or proceeding.

              B.   If MENTOR requests NAMS to accept the defense both of NAMS
and MENTOR in any action or proceeding that is the

<PAGE>


subject of this Section 11.2, then NAMS shall be entitled to condition its
agreement to providing a defense to MENTOR on MENTOR's stipulating in writing
that (a) any information coming to the attention of NAMS's counsel with respect
to the actions and conduct of MENTOR and its employees and agents, including
information provided by such employees and agents, may be shared with NAMS and
(b) if a conflict of interest subsequently develops that precludes such counsel
from continuing to represent both NAMS and MENTOR, then NAMS's designated
counsel shall nonetheless be entitled to continue to represent NAMS,
notwithstanding that it may previously have received information that might be
prejudicial to the interests of MENTOR.

          11.2.2   Defense Procedure.  MENTOR shall notify NAMS in writing
within ten (10) days of the assertion of any claim or discovery of any fact upon
which MENTOR intends to base a claim for defense and/or indemnification under
this Agreement.  The failure to so notify NAMS shall not relieve NAMS of the
duty to defend and indemnify MENTOR with respect to such claim except to the
extent the defense of such claim is actually prejudiced thereby.

          11.2.3   Participation in and Control of Defense.  If NAMS is
obligated to defend MENTOR in a lawsuit, arbitration, negotiation, or other
proceeding concerning a claim pursuant to this Agreement, MENTOR shall have the
right to engage separate counsel, at MENTOR's expense, to monitor and advise
MENTOR about the status and progress of the defense or to otherwise represent
the interests of MENTOR.  To be entitled to sole control of the defense, upon
request by MENTOR, NAMS shall demonstrate, to the reasonable satisfaction of
MENTOR, NAMS's financial ability to carry out its defense obligations (and its
indemnity obligations, if any).  MENTOR shall in any event provide such
cooperation and assistance in the conduct of any such defense as NAMS may
reasonably request.

    11.3  INDEMNIFICATION BY MENTOR.  MENTOR shall indemnify defend and hold
NAMS (including its officers, directors, employees, and agents) harmless from
and against any and all claims by Third Parties (whether based in contract or
tort or otherwise arising by operation of law), losses, damages, penalties,
expenses, settlements, or attorneys' fees that are established by a court of
competent jurisdiction or other dispute resolution tribunal (including an
arbitration panel) to have resulted from or to be attributable to (a) a breach
of a written representation or warranty or failure to perform any covenant or
obligation of MENTOR under this Agreement, (b) any breach of a product warranty
given by MENTOR which (i) exceeds the warranty given by NAMS or (ii) applies to
a kit component supplied by MENTOR, or (c) any negligent acts or omissions of
MENTOR in connection with its marketing and distribution of the Product or kit
components supplied by MENTOR.

          11.3.1  Limitation on MENTOR's Obligation.  In any

<PAGE>


action or proceeding in which liability for personal injury resulting from the
use of the Product is alleged to exist both against MENTOR and NAMS based in
whole or in part upon theories of negligent manufacturing, defective product,
product liability, strict liability or similar theories of law:

              A.   MENTOR shall not be obligated by this Section 11.3 to defend
NAMS solely because allegations are also made that MENTOR (a) breached a written
representation or warranty given by MENTOR under this Agreement or to its
Customers, or (b) was negligent in connection with its marketing and
distribution of the Product; but

              B.   If such allegations are made and (i) MENTOR declines to
defend NAMS with respect thereto, and (ii) MENTOR subsequently acknowledges, or
it is determined, that MENTOR is liable by reason of the facts set forth in such
allegations, then MENTOR shall be liable to NAMS for that portion of the costs
and fees incurred by NAMS in defending such action or proceeding that is equal
to MENTOR's percentage of liability for the damages awarded in any such action
or proceeding.

          11.3.2   Defense Procedure.  NAMS shall notify MENTOR in writing
within ten (10) days of the assertion of any claim or discovery of any fact upon
which NAMS intends to base a claim for defense and/or indemnification under this
Agreement.  Subject to the provisions of Section 11.3.1, above, NAMS's failure
to so notify MENTOR shall not relieve MENTOR of the duty to defend and indemnify
NAMS with respect to such claim except to the extent the defense of such claim
is actually prejudiced thereby.

          11.3.3   Participation in and Control of Defense. If MENTOR is
obligated or elects to defend NAMS in a lawsuit, arbitration, negotiation, or
other proceeding concerning a claim pursuant to this Agreement, NAMS shall have
the right to engage separate counsel, at NAMS's expense, to monitor and advise
NAMS about the status and progress of the defense or to otherwise represent the
interests of NAMS.  To be entitled to sole control of the defense, upon request
by NAMS, MENTOR shall demonstrate, to the reasonable satisfaction of NAMS, its
financial ability to carry out its defense obligations (and its indemnity
obligations, if any).

    11.4  LIMITATION OF LIABILITY.  WITH RESPECT TO CLAIMS MADE BY ONE PARTY (A
"CLAIMANT") AGAINST THE OTHER (A "DEFENDANT") UNDER THIS AGREEMENT FOR CLAIMS
NOT ARISING OR RESULTING FROM OR BASED UPON THIRD-PARTY CLAIMS, THE DEFENDANT
SHALL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, EXEMPLARY OR
PUNITIVE DAMAGES, INCLUDING WITHOUT LIMITATION, LOST PROFITS, IN CONNECTION WITH
OR ARISING OUT OF THIS AGREEMENT, REGARDLESS OF WHETHER A CLAIM AGAINST THE
DEFENDANT SOUNDS IN CONTRACT OR TORT (INCLUDING, BUT NOT LIMITED TO, ACTIONS
BASED ON ANY ALLEGED JOINT OR SOLE NEGLIGENCE OR THE DEFENDANT).


<PAGE>


12. TERM AND TERMINATION

    12.1  COMMENCEMENT.  This Agreement shall commence on the Effective Date
hereof and, unless (a) extended pursuant to Section 4.2 of this Agreement or (b)
sooner terminated as provided by this Agreement, shall continue for a term of
five (5) Sales Years from the Term Commencement Date.

    12.2  PARTIAL TERMINATIONS.  NAMS shall be entitled to terminate MENTOR's
exclusive marketing and distribution rights with respect to a specific
Geographic Market Area as provided in Section 5.6, above, if the parties are
unable to develop marketing plans and strategies that enable MENTOR to attain
and retain the Target Market Share, but no such termination shall be deemed to
be a termination for cause or to entitle NAMS to recover damages or any other
amounts from MENTOR.  Should NAMS exercise such right, then MENTOR shall be
entitled to terminate this Agreement, or to begin manufacturing the Product or
procuring it from other sources for distribution in such Geographic Market Area
as provided by Section 5.9, above.

    12.3  TERMINATION FOR CAUSE.  Any party who is not in material default in
the performance of its obligations under this Agreement shall be entitled to
terminate this Agreement for cause by giving written notice of intention to
terminate, specifying the effective date of termination, not less than thirty
(30) days prior to the effective date of termination, upon the occurrence of any
of the following events:

          12.3.1   The other party (herein, a defaulting party") has committed
a material breach of any warranty, representation or covenant under this
Agreement, including the obligation to pay any amount owing under this Agreement
when due, and such breach remains uncured after written notice of default,
specifying the nature thereof, has been given to the defaulting party unless,
prior to the expiration of the applicable cure period, the defaulting party has
commenced and thereafter pursues with diligence to completion those actions
necessary to cure within the applicable cure period any such breach or default
that is capable of being cured.  The applicable cure period shall be thirty (30)
days, but shall be subject to extension for a reasonable period of time if the
default (a) is not curable by the payment of amounts owing to the other party
that are past due, and (b) is of such a nature that it cannot reasonably be
cured with due diligence within thirty (30) days.

          12.3.2   The other party becomes Insolvent.

    12.4  RIGHTS AND DUTIES UPON TERMINATION.  Upon termination of this
Agreement for any reason:

          12.4.1   Any sublicenses entered into by MENTOR shall automatically
terminate.

<PAGE>


          12.4.2   Each party shall return to the providing party all copies of
any Confidential Information that was provided by one party to the other during
the course of this Agreement.

          12.4.3   MENTOR shall be entitled to continue to market and sell its
existing inventory of the Product to the extent permitted by law until such
inventory has been exhausted provided that such sales are made at prices and on
terms that are consistent with MENTOR's past practices.

          12.4.4   NAMS shall continue to accept Product returns made pursuant
to Section 6.17, above, and shall, at its option, either replace the Product or
issue a credit directly to the Customer.

          12.4.5   Each party shall continue to be bound by the provisions of
this Agreement which, by their nature, extend beyond or cannot be fully
performed prior to the effective date of termination, including (a)
indemnification obligations and (b) provisions relating to the protection,
nondisclosure and restrictions on use of Confidential Information, including any
Confidentiality Agreements previously entered into by the parties.

    12.5  SURVIVAL OF REMEDIES.  The termination of this Agreement pursuant to
this Section shall be without prejudice to any rights or any remedies to which
the terminating party is entitled, if any, due to the material breach by one of
the parties of any warranty, representation or covenant given by the defaulting
party under this Agreement.  The limitation on the liability of MENTOR with
respect to its failure to attain and retain Target Market Share shall not be
construed to insulate MENTOR for liability for actual damages caused by its
tortious conduct or by its wrongful breach of its obligations under this
Agreement.

13. GENERAL PROVISIONS

    13.1  NOTICES.  Any notices permitted or required hereunder shall be in
writing and shall be deemed to have been given (a) on the date of delivery if
delivery of a legible copy was made personally or by facsimile transmission, or
(b) on the third (3rd) business day after the date on which mailed by registered
or certified mail, return receipt requested, addressed to the party for whom
intended at the address set forth on the signature page of this Agreement or
such other address, notice of which is given as provided herein.

    13.2  BINDING EFFECT.  This Agreement shall be binding upon and shall inure
to the benefit of each of the parties and their respective heirs, successors,
assigns and legal representatives.  No party hereto shall have the right to
transfer or assign its interest in this Agreement, without the prior written
authorization of the other party hereto, except that (a) either party may freely
assign this Agreement to any Affiliate and (b)

<PAGE>


either party shall have the right to assign its rights and licenses and to
delegate its duties under this Agreement to any third party who purchases
substantially all of the business assets of the assignor or who succeeds to the
business of the assignor by reason of a merger or consolidation.  The assignment
by either party of any rights under this Agreement shall not relieve the
assigning party from any of its obligations under this agreement.

    13.3  FORCE MAJEURE.  Neither of the parties shall be liable for any delay
or default in performing its obligations hereunder if such delay or default is
caused by Force Majeure, provided that the party so affected (a) promptly gives
written notice of the occurrence of such event and the likely effects thereof,
and (b) resumes the performance of its obligations with due diligence as soon as
practicable after the effects of any such event have been alleviated.

    13.4  GOVERNING LAW.  This Agreement, the construction and enforcement of
its terms, and the interpretation of the rights and duties of the parties
hereunder shall be governed by and interpreted in accordance with the laws of
the State of California.

    13.5  RESOLUTION OF DISPUTES.  The parties hereto (a) mutually consent and
submit to the jurisdiction of any state or federal court of competent
jurisdiction located in the City of Los Angeles, State of California, in any
action or proceeding arising out of or relating in any manner to this Agreement,
(b) each waive any claim that any such state or federal court is an inconvenient
forum, and (c) each irrevocably agree that any and all actions or proceedings
arising out of or relating to this Agreement or from transactions contemplated
herein shall be exclusively heard only in such state or federal court.

    13.6  COSTS OF ENFORCEMENT.  Should any action or proceeding be necessary
to construe or enforce this Agreement, then the party prevailing in any such
action or proceeding shall be entitled to recover all court costs and reasonable
attorneys' fees, to be fixed by the court and taxed as part of any judgment
entered therein, and the costs and fees incurred in enforcing or collecting any
such judgment.

    13.7  INDEPENDENT CONTRACTORS.  Each of the parties to this Agreement
understands and stipulates that they are independent contractors, and that this
Agreement is not intended and shall not be construed to make either party a
partner, joint venturer, employee, agent, or legal representative of the other
party for any purpose whatsoever.  Neither party is granted any right or
authority to assume or create any obligation or responsibility, express or
implied, on behalf of or in the name of the other party hereto or to bind the
other party hereto in any manner or thing whatsoever.

    13.8  COMPLETE AGREEMENT.  This written instrument, together

<PAGE>


with any exhibits or appendices referred to herein, constitutes the entire
understanding of the parties with respect to subject matter of this Agreement
and it may not be amended except by an instrument in writing signed by the party
alleged to be bound thereby.



                      (Signatures appear on the following page)

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          OCT-31-1997
<PERIOD-START>                             NOV-01-1996
<PERIOD-END>                               JUL-31-1997
<CASH>                                       1,887,000
<SECURITIES>                                         0
<RECEIVABLES>                                  472,200
<ALLOWANCES>                                   (4,500)
<INVENTORY>                                    380,300
<CURRENT-ASSETS>                             2,836,500
<PP&E>                                         605,900
<DEPRECIATION>                               (276,000)
<TOTAL-ASSETS>                               3,221,100
<CURRENT-LIABILITIES>                          360,400
<BONDS>                                              0
                                0
                                          0
<COMMON>                                        33,200
<OTHER-SE>                                   2,827,500
<TOTAL-LIABILITY-AND-EQUITY>                 3,221,100
<SALES>                                      2,589,500
<TOTAL-REVENUES>                             2,621,500
<CGS>                                        1,367,100
<TOTAL-COSTS>                                  851,300
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 800
<INCOME-PRETAX>                                374,700
<INCOME-TAX>                                   154,500
<INCOME-CONTINUING>                            220,200
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   220,200
<EPS-PRIMARY>                                      .07
<EPS-DILUTED>                                      .07
        

</TABLE>


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