NORTH AMERICAN SCIENTIFIC INC
8-A12G, 1998-10-16
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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                         SECURITIES AND EXCHANGE COMMISSION
                               WASHINGTON D.C. 20549
                                 ------------------

                                      FORM 8-A

                       FOR REGISTRATION OF CERTAIN CLASSES OF
                  SECURITIES PURSUANT TO SECTION 12(B) OR 12(G) OF
                        THE SECURITIES EXCHANGE ACT OF 1934

                          NORTH AMERICAN SCIENTIFIC, INC.
               (Exact name of registrant as specified in its charter)

              DELAWARE                                    51-0366422
(State of incorporation or organization)       (IRS Employer Identification No.)

7435 Greenbush Avenue, North Hollywood CA                          91605
(Address of Principal Executive Offices)                         (Zip Code)

Securities to be registered pursuant to Section 12(b) of the Act:  None

If this form relates to the registration of a class of securities pursuant to 
Section 12(b) of the Exchange Act and is effective upon filing pursuant to 
General Instruction A.(c), check the following box.  /   /

If this form relates to the registration of a class of securities pursuant to 
Section 12(g) of the Exchange Act and is pursuant to General Instruction 
A.(d), check the following box.  / x /

Securities Act registration statement file number to which this form relates:
___________________________
(If applicable)

Securities to be registered pursuant to Section 12(g) of the Act:

                            COMMON STOCK PURCHASE RIGHTS
                        -----------------------------------
                                  (Title of Class)

Index to Exhibits Appears on Page 6

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                                          1
<PAGE>

ITEM 1.  DESCRIPTION OF REGISTRANT'S SECURITIES TO BE REGISTERED. 

     On October 12, 1998, the Board of Directors of North American 
Scientific, Inc. (the "Company") declared a dividend distribution of one 
right (a "Right") for each outstanding share of common stock, par value $.01 
per share (the "Common Shares"), of the Company. The distribution is payable 
on October 22, 1998 (the "Record Date") to the shareholders of record as of 
the close of business on the Record Date. Each Right entitles the registered 
holder to purchase from the Company one Common Share at a price of $80.00 
(the "Purchase Price"), subject to adjustment. The description and terms of 
the Rights are set forth in a Rights Agreement, dated as of October 12, 1998 
(the "Rights Agreement"), between the Company and U.S. Stock Transfer 
Company, as Rights Agent (the "Rights Agent"). 

     Until the earliest to occur of (i) the close of business on the tenth 
calendar day (or such later date as may be specified by the Board of 
Directors) following a public announcement that a person or group of 
affiliated or associated persons has acquired, or obtained the right to 
acquire, beneficial ownership of 15% or more of the outstanding Common Shares 
(an "Acquiring Person"), (ii) the close of business on the tenth calendar day 
following the commencement of a tender offer or exchange offer by a person or 
group of affiliated or associated persons, the consummation of which would 
result in beneficial ownership by such person or group of 15% or more of the 
outstanding Common Shares, or (iii) the close of business on the tenth 
calendar day following the first date of public announcement of the first 
occurrence of a Flip-in Event or a Flip-over Event (as such terms are 
hereinafter defined) (the earliest of such dates being hereinafter called the 
"Distribution Date"), the Rights will be evidenced, with respect to any of 
the Common Share certificates outstanding as of the Record Date, by such 
Common Share certificates. 

     The Rights Agreement provides that, until the Distribution Date, the 
Rights will be transferred with and only with the Common Shares. Until the 
Distribution Date (or earlier redemption or expiration of the Rights), new 
Common Share certificates issued after the Record Date upon transfer or new 
issuance of Common Shares will contain a notation incorporating the Rights 
Agreement by reference. Until the Distribution Date (or earlier redemption or 
expiration of the Rights), the surrender for transfer of any certificates for 
Common Shares in respect of which Rights have been issued will also 
constitute the transfer of the Rights associated with the Common Shares 
represented by such certificates. As soon as practicable following the 
Distribution Date, separate certificates evidencing the Rights (the "Right 
Certificates") will be mailed to holders of record of the Common Shares as of 
the close of business on the Distribution Date and such separate Right 
Certificates alone will evidence the Rights. 

     No Right is exercisable at any time prior to the Distribution Date. The 
Rights will expire on October 22, 2008 (the "Final Expiration Date") unless 
earlier redeemed or exchanged by the Company as described below. Until a 
Right is exercised, the holder thereof, as such, will have no rights as a 
shareholder of the Company, including without

                                       2
<PAGE>

limitation the right to vote or to receive dividends.

     The Purchase Price payable, and the number of Common Shares or other 
securities issuable, upon exercise of the Rights are subject to adjustment 
from time to time to prevent dilution (i) in the event of a stock dividend 
on, or a subdivision, combination or reclassification of, the Common Shares, 
(ii) upon the grant to holders of the Common Shares of certain rights or 
warrants to subscribe for or purchase Common Shares at a price, or securities 
convertible into Common Shares with a conversion price, less than the then 
current market price of the Common Shares or (iii) upon the distribution to 
holders of the Common Shares of evidences of indebtedness or cash (excluding 
regular periodic cash dividends), assets, stock (excluding dividends payable 
in Common Shares) or of subscription rights or warrants (other than those 
referred to above). 

     In the event (a "Flip-in Event") that (i) any person or group of 
affiliated or associated persons becomes the beneficial owner of 20% or more 
of the outstanding Common Shares, (ii) any Acquiring Person merges into or 
combines with the Company and the Company is the surviving corporation or any 
Acquiring Person effects certain other transactions with the Company, as 
described in the Rights Agreement, or (iii) during such time as there is an 
Acquiring Person, there shall be any reclassification of securities or 
recapitalization or reorganization of the Company which has the effect of 
increasing by more than 1% the proportionate share of the outstanding shares 
of any class of equity securities of the Company or any of its subsidiaries 
beneficially owned by the Acquiring Person, proper provision shall be made so 
that each holder of a Right, other than Rights that are or were owned 
beneficially by the Acquiring Person (which, from and after the later of the 
Distribution Date and the date of the earliest of any such events, will be 
void), will thereafter have the right to receive, upon exercise thereof at 
the then current exercise price of the Right, that number of Common Shares 
(or, under certain circumstances, an economically equivalent security or 
securities of the Company) having a market value of two times the exercise 
price of the Right.

     To illustrate the operation of such an adjustment, at a Purchase Price 
of $80.00, assuming the current market price (as determined pursuant to the 
provisions of the Rights Agreement) per Common Share were $20.00, each Right 
not owned beneficially by an Acquiring Person at or after the time of such an 
occurrence would entitle its holder to purchase (after the Distribution Date) 
from the Company 8 Common Shares (having a market value of $160.00) for 
$80.00. 

     In the event (a "Flip-over Event") that, following the first date of 
public announcement that a person has become an Acquiring Person, (i) the 
Company merges with or into any person and the Company is not the surviving 
corporation, (ii) any person merges with or into the Company and the Company 
is the surviving corporation, but its Common Shares are changed or exchanged, 
or (iii) 50% or more of the Company's assets or earning power, including 
without limitation securities creating obligations of the Company, are sold, 
proper provision shall be made so that each holder of a Right will thereafter 
have the right to receive, upon the exercise thereof at the then current 
exercise

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price of the Right, that number of shares of common stock (or, under certain 
circumstances, an economically equivalent security or securities) of such 
other person which at the time of such transaction would have a market value 
of two times the exercise price of the Right.

At any time after the later of the Distribution Date and the first occurrence 
of a Flip-in Event or Flip-over Event and prior to the acquisition by any 
person or group of affiliated or associated persons of 50% or more of the 
outstanding Common Shares, the Board of Directors of the Company may exchange 
the Rights (other than any Rights which have become void), in whole or in 
part, at an exchange ratio of one Common Share per Right (subject to 
adjustment). 

     With certain exceptions, no adjustment in the Purchase Price will be 
required until cumulative adjustments require an adjustment in the Purchase 
Price of at least 1%. The Company is not required to issue fractional Common 
Shares or other securities issuable upon the exercise of Rights. In lieu of 
issuing such securities, the Company may make a cash payment, as provided in 
the Rights Agreement.

     The Company may redeem the Rights in whole, but not in part, at a price 
of $0.001 per Right (the "Redemption Price"), at any time prior to the close 
of business on the later of (i) the Distribution Date and (ii) the first date 
of public announcement that a person has become an Acquiring Person. 
Immediately upon any redemption of the Rights, the right to exercise the 
Rights will terminate and the only right of the holders of Rights will be to 
receive the Redemption Price.

     The Rights Agreement may be amended by the Company without the approval 
of any holders of Right Certificates, including amendments which add other 
events requiring adjustment to the purchase price payable and the number of 
Common Shares or other securities issuable upon the exercise of the Rights or 
which modify procedures relating to the redemption of the Rights, provided 
that no amendment may be made at such time as the Rights are not then 
redeemable which decreases the stated Redemption Price or the period of time 
remaining until the Final Expiration Date or which modifies a time period 
relating to when the Rights may be redeemed.

     The Rights have certain anti-takeover effects. The Rights will cause 
substantial dilution to a person or group that attempts to acquire the 
Company on terms not approved by the Board of Directors, except pursuant to 
an offer conditioned on a substantial number of Rights being acquired. The 
Rights should not interfere with any merger or other business combination 
approved by the Board of Directors since (subject to the limitations 
described above) the Rights may be redeemed by the Company at the Redemption 
Price prior to the time that the Rights would otherwise become exercisable, 
or if later, the time that a person or group has become an Acquiring Person.

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     The Rights Agreement, which includes the form of Right Certificate and 
the Summary of Rights to Purchase Common Shares as exhibits thereto, and the 
form of letter to stockholders announcing the declaration of the dividend 
distribution of the Rights are attached hereto as exhibits and are 
incorporated herein by this reference. The foregoing description of the 
Rights does not purport to be complete and is qualified in its entirety by 
reference to such exhibits.


ITEM 2.  EXHIBITS.

99.1 Rights Agreement (including Form of Right Certificate, as Exhibit A, and
     Summary of Rights to Purchase Common Shares, as Exhibit B)
99.2 Form of letter to stockholders dated October 22, 1998.


SIGNATURE

     Pursuant to the requirements of Section 12 of the Securities Exchange 
Act of 1934, the registrant has duly caused this registration statement to be 
signed on its behalf by the undersigned, thereto duly authorized.

                                   NORTH AMERICAN SCIENTIFIC, INC.

                                       /s/ L. Michael Cutrer
                                   -----------------------------------
                                   By: L. Michael Cutrer 
                                       President and Chief Executive Officer

Dated: October 16, 1998

                                       5
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                                 INDEX TO EXHIBITS

<TABLE>
<CAPTION>

     EXHIBIT
     NUMBER                                   EXHIBIT
    <S>       <C>  <C>
     99.1      --   Rights Agreement (including Form of Right Certificate, as
                    Exhibit A, and Summary of Rights to Purchase Common Shares,
                    as Exhibit B).
     99.2      --   Form of letter to stockholders dated October 22, 1998.
</TABLE>

                                       6


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EXHIBIT 99.1
===============================================================================

                          NORTH AMERICAN SCIENTIFIC, INC.

                                        AND

                          U.S. STOCK TRANSFER CORPORATION

                                  RIGHTS AGREEMENT

                            DATED AS OF OCTOBER 12, 1998

===============================================================================
<PAGE>

TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                           PAGE
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<S>                                                                        <C>


RECITALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     1
Section  1.  Certain Definitions . . . . . . . . . . . . . . . . . . . .     1
Section  2.  Appointment of Rights Agent . . . . . . . . . . . . . . . .     4
Section  3.  Issue of Right Certificates . . . . . . . . . . . . . . . .     5
Section  4.  Form of Right Certificates. . . . . . . . . . . . . . . . .     6
Section  5.  Countersignature and Registration . . . . . . . . . . . . .     6
Section  6.  Transfer, Split Up, Combination and Exchange of Right
             Certificates; Mutilated, Destroyed, Lost or Stolen Right
             Certificates. . . . . . . . . . . . . . . . . . . . . . . .     7
Section  7.  Exercise of Rights; Purchase Price; Expiration Date of
             Rights. . . . . . . . . . . . . . . . . . . . . . . . . . .     7
Section  8.  Cancellation and Destruction of Right Certificates. . . . .     9
Section  9.  Company Covenants Concerning Securities and Rights. . . . .     9
Section 10.  Record Date . . . . . . . . . . . . . . . . . . . . . . . .    11
Section 11.  Adjustment of Purchase Price, Number and Kind of Securities
             or Number of Rights . . . . . . . . . . . . . . . . . . . .    11
Section 12.  Certificate of Adjusted Purchase Price or Number of
             Securities. . . . . . . . . . . . . . . . . . . . . . . . .    18
Section 13.  Consolidation, Merger or Sale or Transfer of Assets or
             Earning Power . . . . . . . . . . . . . . . . . . . . . . .    18
Section 14.  Fractional Rights and Fractional Securities . . . . . . . .    21
Section 15.  Rights of Action. . . . . . . . . . . . . . . . . . . . . .    22
Section 16.  Agreement of Rights Holders . . . . . . . . . . . . . . . .    22
Section 17.  Right Certificate Holder Not Deemed a Shareholder . . . . .    23
Section 18.  Concerning the Rights Agent . . . . . . . . . . . . . . . .    23
Section 19.  Merger or Consolidation or Change of Name of Rights Agent .    24
Section 20.  Duties of Rights Agent. . . . . . . . . . . . . . . . . . .    24
Section 21.  Change of Rights Agent  . . . . . . . . . . . . . . . . . .    26
Section 22.  Issuance of New Right Certificates  . . . . . . . . . . . .    27
Section 23.  Redemption. . . . . . . . . . . . . . . . . . . . . . . . .    27
Section 24.  Notice of Certain Events. . . . . . . . . . . . . . . . . .    28
Section 25.  Notices . . . . . . . . . . . . . . . . . . . . . . . . . .    29
Section 26.  Supplements and Amendments. . . . . . . . . . . . . . . . .    30
Section 27.  Exchange. . . . . . . . . . . . . . . . . . . . . . . . . .    30
Section 28.  Successors; Certain Covenants . . . . . . . . . . . . . . .    31
Section 29.  Benefits of this Agreement. . . . . . . . . . . . . . . . .    31
Section 30.  Determinations and Actions by the Board of Directors,
             etc.  . . . . . . . . . . . . . . . . . . . . . . . . . . .    31
Section 31.  Severability. . . . . . . . . . . . . . . . . . . . . . . .    32
</TABLE>
<PAGE>

<TABLE>
<CAPTION>
<S>                                                                        <C>
Section 32.  Governing Law . . . . . . . . . . . . . . . . . . . . . . .    32
Section 33.  Counterparts. . . . . . . . . . . . . . . . . . . . . . . .    32
Section 34.  Descriptive Headings. . . . . . . . . . . . . . . . . . . .    32
Exhibit  A   Form of Right Certificate . . . . . . . . . . . . . . . . .   A-1
Exhibit  B   Summary of Rights to Purchase Common Shares . . . . . . . .   B-1
</TABLE>
<PAGE>

RIGHTS AGREEMENT

     This RIGHTS AGREEMENT, dated as of October 14, 1998 (this "Agreement"), 
is made and entered into by and between North American Scientific, Inc., a 
Delaware corporation (the "Company"), and U.S. Stock Transfer Corporation, a 
California corporation (the "Rights Agent").

RECITALS

     WHEREAS, on October 12, 1998, the Board of Directors of the Company 
authorized and declared a dividend distribution of one right ("Right") for 
each share of Common Stock, par value $.01 per share, of the Company (a 
"Common Share") outstanding as of the Close of Business (as hereinafter 
defined) on October 22, 1998, (the "Record Date"), each Right initially 
representing the right to purchase one Common Share, upon the terms and 
subject to the conditions herein set forth, and further authorized and 
directed the issuance of one Right with respect to each Common Share issued 
or delivered by the Company (whether originally issued or delivered from the 
Company's treasury) after the Record Date but prior to the earlier of the 
Distribution Date (as hereinafter defined) and the Expiration Date (as 
hereinafter defined).

     NOW THEREFORE, in consideration of the premises and the mutual 
agreements herein set forth, the parties hereby agree as follows:

Section 1.     Certain Definitions.  For purposes of this Agreement, the 
following terms shall have the meanings indicated:

     (a)    "Acquiring Person" shall mean any Person (other than the Company 
or any Subsidiary of the Company or any employee benefit or stock ownership 
plan of the Company or of any Subsidiary of the Company or any entity holding 
Common Shares for or pursuant to the terms of any such plan) who or which, 
together with all Affiliates and Associates of such Person, shall be the 
Beneficial Owner of 15% or more of the Common Shares then outstanding. 
 
     (b)    A Person shall be deemed the "Beneficial Owner" of, and to 
"beneficially own," any securities:
 
     (i)    which such Person or any of such Person's Affiliates or 
associates, directly or indirectly, has the right to acquire (whether such 
right is exercisable immediately or only after the passage of time) pursuant 
to any agreement, arrangement or understanding (whether or not in writing), 
or upon the exercise of conversion rights, exchange rights, rights, warrants 
or options, or otherwise (in each case, other than upon exercise or exchange 
of the Rights); provided, however, that a Person shall not be deemed the 
Beneficial Owner of, or to beneficially own, securities tendered pursuant to 
a tender or exchange offer made by or on behalf of such Person or any of such 
Person's Affiliates or Associates until such tendered securities are accepted 
for purchase or exchange; or 

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<PAGE>

     (ii)   which such Person or any of such Person's Affiliates or 
associates, directly or indirectly, has the right to vote or dispose of, 
including pursuant to any agreement, arrangement or understanding whether or 
not in writing); or

     (iii)  of which any other Person is the Beneficial Owner if  such Person 
or any of such Person's Affiliates or Associates has any agreement, 
arrangement or understanding (whether or not in writing) with such other 
Person (or any of such other Person's Affiliates or Associates) with respect 
to acquiring, holding, voting or disposing of any securities of the Company;  

provided, however, that a Person shall not be deemed the Beneficial Owner of, 
or to beneficially own, any security (A) if such Person has the right to vote 
such security pursuant to an agreement, arrangement or understanding (whether 
or not in writing) which (1) arises solely from a revocable proxy given to 
such Person in response to a public proxy or consent solicitation made 
pursuant to, and in accordance with, the applicable rules and regulations of 
the Exchange Act and (2) is not also then reportable on Schedule 13D under 
the Exchange Act (or any comparable or successor report), or (B) if such 
beneficial ownership arises solely as a result of such Person's status as a 
"clearing agency", as defined in Section 3(a)(23) of the Exchange Act; and 
provided, further, that nothing in this paragraph (b) shall cause a Person 
engaged in business as an underwriter of securities to be the Beneficial 
Owner of, or to beneficially own, any securities acquired through such 
Person's participation in good faith in an underwriting syndicate until the 
expiration of 40 calendar days after the date of such acquisition, or such 
later date as the Board of Directors of the Company may determine in any 
specific case.

     (c)    "Business Day" shall mean any day other than a Saturday, Sunday 
or a day on which banking institutions in the State of California (or such 
other state in which the principal office of the Rights Agent is located) are 
authorized or obligated by law or executive order to close. 
 
     (d)    "Close of Business" on any given date shall mean 5:00 P.M., 
Pacific time, on such date; provided, however, that if such date is not a 
Business Day it shall mean 5:00 P.M., Pacific time, on the next succeeding 
Business Day.
 
     (e)    "Common Shares" when used with reference to the Company shall 
mean the Common Stock, par value $.01 per share, of the Company; provided, 
however, that, if the Company is the continuing or surviving corporation in a 
transaction described in Section 11(a)(ii) or Section 13(a)(ii) hereof, 
"Common Shares" when used with reference to the Company shall mean the 
capital stock or equity security with the greatest aggregate voting power of 
the Company. "Common Shares" when used with reference to any corporation or 
other legal entity, other than the Company, including an Issuer, shall mean 
the capital stock or equity security with the greatest aggregate voting power 
of such corporation or other legal entity. 

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<PAGE>

     (f)    "Company" shall mean North American Scientific, Inc., a Delaware 
corporation.
 
     (g)    "Distribution Date" shall mean the earliest of: (i) the Close of 
Business on the tenth calendar day (or, unless the Distribution Date shall 
have previously occurred, such later date as may be specified by the Board of 
Directors of the Company) after the Share Acquisition Date, (ii) the Close of 
Business on the tenth Business Day (or, unless the Distribution Date shall 
have previously occurred, such later date as may be specified by the Board of 
Directors of the Company) after the date of the commencement of a tender or 
exchange offer by any Person (other than the Company or any Subsidiary of the 
Company or any employee benefit or stock ownership plan of the Company or of 
any Subsidiary of the Company or any entity holding Common Shares for or 
pursuant to the terms of any such plan), if upon the consummation thereof 
such Person would be the Beneficial Owner of 15% or more of the outstanding 
Common Shares, and (iii) the Close of Business on the tenth calendar day 
after the first date of public announcement by the Company or an Acquiring 
Person (by press release, filing made with the Securities and Exchange 
Commission or otherwise) of the first occurrence of a Triggering Event; 
provided, however, that if the earliest of such dates would otherwise occur 
prior to the Record Date, the Distribution Date shall mean the Close of 
Business on the Record Date.

     (h)    "Exchange Act" shall mean the Securities Exchange Act of 1934, as 
amended.

     (i)    "Expiration Date" shall mean the earliest of (i) the Close of 
Business on the Final Expiration Date, (ii) the time at which the Rights are 
redeemed as provided in Section 23 hereof, and (iii) the time at which all 
exercisable Rights are exchanged as provided in Section 27 hereof. 

     (j)    "Final Expiration Date" shall mean the tenth anniversary of the 
Record Date.

     (k)    "Flip-in Event" shall mean any event described in clauses (A), 
(B) or (C) of Section 11(a)(ii) hereof.

     (l)    "Flip-over Event" shall mean any event described in subsections 
(i), (ii) or (iii) of Section 13(a) hereof.

     (m)    "Issuer" shall have the meaning set forth in Section 13(b) 
hereof. 

     (n)    "NASDAQ" shall mean the National Association of Securities 
Dealers, Inc. Automated Quotation System. 

     (o)    "Person" shall mean any individual, firm, corporation, 
partnership, limited liability company, trust or other legal entity, and 
shall include any successor (by merger or otherwise) of such entity.

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<PAGE>

     (p)    "Purchase Price" shall mean initially $80.00 per Common Share and 
shall be subject to adjustment from time to time as provided in this 
Agreement.

     (q)    "Redemption Price" shall mean $0.001 per Right, subject to 
adjustment by resolution of the Board of Directors of the Company to reflect 
any stock split, stock dividend or similar transaction occurring after the 
date hereof.

     (r)    "Right" shall have the meaning set forth in the Recitals to this 
Agreement.

     (s)    "Right Certificates" shall mean certificates evidencing the 
Rights, in substantially the form of Exhibit A attached hereto. 

     (t)    "Rights Agent" shall mean U.S. Stock Transfer Corporation unless 
and until a successor Rights Agent shall have become such pursuant to the 
terms of this Agreement, and thereafter, "Rights Agent" shall mean such 
successor Rights Agent.

     (u)    "Securities Act" shall mean the Securities Act of 1933, as 
amended.

     (v)    "Share Acquisition Date" shall mean the first date of public 
announcement by the Company or an Acquiring Person (by press release, filing 
made with the Securities and Exchange Commission or otherwise) that an 
Acquiring Person has become such.

     (w)    "Subsidiary" when used with reference to any Person shall mean 
any corporation or other legal entity of which a majority of the voting power 
of the voting equity securities or equity interests is owned, directly or 
indirectly, by such Person; provided, however, that for purposes of Section 
13(b) hereof, "Subsidiary" when used with reference to any Person shall mean 
any corporation or other legal entity of which at least 20% of the voting 
power of the voting equity securities or equity interests is owned, directly 
or indirectly, by such Person.

     (x)    "Summary of Rights" shall mean the Summary of Rights to Purchase 
Common Shares, in substantially the form of Exhibit B attached hereto.

     (y)    "Trading Day" shall mean any day on which the principal national 
securities exchange on which the Common Shares are listed or admitted to 
trading is open for the transaction of business or, if the Common Shares are 
not listed or admitted to trading on any national securities exchange, a 
Business Day.

     (z)    "Triggering Event" shall mean any Flip-in Event or Flip-over 
Event.

     Section 2.     Appointment of Rights Agent.  The Company hereby appoints 
the Rights Agent to act as agent for the Company and the holders of the 
Rights (who, in accordance with Section 3 hereof, shall also be, prior to the 
Distribution Date, the holders of the Common Shares) in accordance with the 
terms and conditions hereof, and the Rights Agent hereby accepts such 
appointment. The Company may from time to time act as Co-Rights Agent or 
appoint such Co-Rights Agents as it may deem necessary or 

                                       4
<PAGE>

desirable. Any actions which may be taken by the Rights Agent pursuant to the 
terms of this Agreement may be taken by any such Co-Rights Agent. To the 
extent that any Co-Rights Agent takes any action pursuant to this Agreement, 
such Co-Rights Agent shall be entitled to all of the rights and protections 
of, and subject to all of the applicable duties and obligations imposed upon, 
the Rights Agent pursuant to the terms of this Agreement.

     Section 3.  Issue of Right Certificates.

     (a)    Until the Distribution Date, (i) the Rights shall be evidenced by 
the certificates representing Common Shares registered in the names of the 
record holders thereof (which certificates representing Common Shares shall 
also be deemed to be Right Certificates), together with a copy of the Summary 
of Rights, (ii) the Rights shall be transferable only in connection with the 
transfer of the underlying Common Shares, and (iii) the surrender for 
transfer of any certificates evidencing Common Shares in respect of which 
Rights have been issued, with or without a copy of the Summary of Rights, 
shall also constitute the transfer of the Rights associated with the Common 
Shares evidenced by such certificates. 

     (b)    As promptly as practicable after the Record Date, the Company 
shall send a copy of the Summary of Rights by first-class, postage prepaid 
mail, to each record holder of Common Shares as of the close of business on 
the Record Date, at the address of such holder shown on the records of the 
Company as of such date.  

     (c)    Rights shall be issued by the Company in respect of all Common 
Shares (other than Common Shares issued upon the exercise or exchange of any 
Right) issued or delivered by the Company (whether originally issued or 
delivered from the Company's treasury) after the Record Date but prior to the 
earlier of the Distribution Date and the Expiration Date. Certificates 
evidencing such Common Shares shall have stamped on, impressed on, printed 
on, written on or otherwise affixed to them the following legend or such 
similar legend as the Company may deem appropriate and as is not inconsistent 
with the provisions of this Agreement, or as may be required to comply with 
any applicable law or with any rule or regulation made pursuant thereto or 
with any rule or regulation of any stock exchange or transaction reporting 
system on which the Common Shares may from time to time be listed or quoted, 
or to conform to usage: 

     This Certificate also evidences and entitles the holder hereof to certain
     Rights as set forth in a Rights Agreement between North American
     Scientific, Inc. (the "Company") and U.S. Stock Transfer Corporation dated
     as of October 12, 1998 (the "Rights Agreement"), the terms of which are
     hereby incorporated herein by reference and a copy of which is on file at
     the principal executive offices of the Company. Under certain
     circumstances, as set forth in the Rights Agreement, such Rights may be
     redeemed, may expire, may be amended or may be evidenced by separate
     certificates and no longer be evidenced by this Certificate. The Company
     will mail to the holder of this Certificate a copy of the Rights Agreement
     without charge promptly after receipt of a written request therefor. Under
     certain 

                                       5
<PAGE>

     circumstances as set forth in the Rights Agreement, Rights beneficially
     owned by an Acquiring Person or any Affiliate or Associate of an 
     Acquiring Person (as such terms are defined in the Rights Agreement) may
     become null and void.

     (d)    As promptly as practicable after the Distribution Date, the 
Company shall prepare and execute, the Rights Agent will countersign and the 
Company shall send or cause to be sent (and the Rights Agent shall, if 
requested, send), by first-class, insured, postage prepaid mail, to each 
record holder of Common Shares as of the Close of Business on the 
Distribution Date, at the address of such holder shown on the records of the 
Company, a Right Certificate, evidencing one Right for each Common Share so 
held, subject to adjustment. As of and after the Distribution Date, the 
Rights shall be evidenced solely by such Right Certificates.  

     Section 4.     Form of Right Certificates.  The Right Certificates (and 
the form of election to purchase and form of assignment to be printed on the 
reverse thereof) shall be substantially in the form set forth as Exhibit A 
hereto with such changes, marks of identification or designation and such 
legends, summaries or endorsements printed thereon as the Company may deem 
appropriate and as are not inconsistent with the provisions of this 
Agreement, or as may be required to comply with any applicable law or with 
any rule or regulation made pursuant thereto or with any rule or regulation 
of any stock exchange or transaction reporting system on which the Rights may 
from time to time be listed or quoted, or to conform to usage. Subject to the 
provisions of Section 22 hereof, the Right Certificates, whenever issued, on 
their face shall entitle the holders thereof to purchase such number of 
Common Shares as shall be set forth therein at the Purchase Price set forth 
therein, but the Purchase Price, the number and kind of securities issuable 
upon exercise of each Right and the number of Rights outstanding shall be 
subject to adjustment as provided herein. 

Section 5.  Countersignature and Registration.

     (a)    The Right Certificates shall be executed on behalf of the Company 
by its Chief Executive Officer, Chief Financial Officer or any Vice 
President, either manually or by facsimile signature, and shall be attested 
by the Secretary or an Assistant Secretary of the Company, either manually or 
by facsimile signature. The Right Certificates shall be manually 
countersigned by the Rights Agent and shall not be valid for any purpose 
unless so countersigned. In case any officer of the Company who shall have 
signed any of the Right Certificates shall cease to be such officer of the 
Company before counter-signature by the Rights Agent and issuance and 
delivery by the Company, such Right Certificates, nevertheless, may be 
countersigned by the Rights Agent, and issued and delivered by the Company 
with the same force and effect as though the person who signed such Right 
Certificates had not ceased to be such officer of the Company; and any Right 
Certificate may be signed on behalf of the Company by any person who, at the 
actual date of the execution of such Right Certificate, shall be a proper 
officer of the Company to sign such Right Certificate, although at the date 
of the execution of this Rights Agreement any such person was not such an 
officer.

                                       6
<PAGE>

     (b)    Following the Distribution Date, the Rights Agent shall keep or 
cause to be kept, at the principal office of the Rights Agent designated for 
such purpose and at such other offices as may be required to comply with any 
applicable law or with any rule or regulation made pursuant thereto or with 
any rule or regulation of any stock exchange or any transaction reporting 
system on which the Rights may from time to time be listed or quoted, books 
for registration and transfer of the Right Certificates issued hereunder. 
Such books shall show the names and addresses of the respective holders of 
the Right Certificates, the number of Rights evidenced on its face by each of 
the Right Certificates and the date of each of the Right Certificates. 
 
     Section 6.     Transfer, Split Up, Combination and Exchange of Right 
Certificates; Mutilated, Destroyed, Lost or Stolen Right Certificates. 
 
     (a)    Subject to the provisions of Sections 7(d) and 14 hereof, at any 
time after the Close of Business on the Distribution Date and prior to the 
Expiration Date, any Right Certificate or Right Certificates representing 
exercisable Rights may be transferred, split up, combined or exchanged for 
another Right Certificate or Right Certificates, entitling the registered 
holder to purchase a like number of Common Shares (or other securities, as 
the case may be) as the Right Certificate or Right Certificates surrendered 
then entitled such holder (or former holder in the case of a transfer) to 
purchase. Any registered holder desiring to transfer, split up, combine or 
exchange any such Right Certificate shall make such request in writing 
delivered to the Rights Agent, and shall surrender the Right Certificate or 
Right Certificates to be transferred, split up, combined or exchanged at the 
principal office of the Rights Agent designated for such purpose. Thereupon 
or as promptly as practicable thereafter, subject to the provisions of 
Sections 7(d) and 14 hereof, the Company shall prepare, execute and deliver 
to the Rights Agent, and the Rights Agent shall countersign and deliver a 
Right Certificate or Right Certificates, as the case may be, as so requested. 
The Company may require payment of a sum sufficient to cover any tax or 
governmental charge that may be imposed in connection with any transfer, 
split up, combination or exchange of Right Certificates.
 
     (b)    Upon receipt by the Company and the Rights Agent of evidence 
reasonably satisfactory to them of the loss, theft, destruction or mutilation 
of a Right Certificate, and, in case of loss, theft or destruction, of 
indemnity or security reasonably satisfactory to them, and reimbursement to 
the Company and the Rights Agent of all reasonable expenses incidental 
thereto, and upon surrender to the Rights Agent and cancellation of the Right 
Certificate if mutilated, the Company shall prepare, execute and deliver a 
new Right Certificate of like tenor to the Rights Agent and the Rights Agent 
shall countersign and deliver such new Right Certificate to the registered 
holder in lieu of the Right Certificate so lost, stolen, destroyed or 
mutilated. 
 
     Section 7.      Exercise of Rights; Purchase Price; Expiration Date of 
Rights. 
 
     (a)    The registered holder of any Right Certificate may exercise the 
Rights evidenced thereby (except as otherwise provided herein) in whole or in 
part at any time 

                                       7
<PAGE>

after the Distribution Date and prior to the Expiration Date, upon surrender 
of the Right Certificate, with the form of election to purchase on the 
reverse side thereof duly executed, to the Rights Agent at the office or 
offices of the Rights Agent designated for such purpose, together with 
payment in cash, in lawful money of the United States of America by certified 
check or bank draft payable to the order of the Company equal to the sum of 
(i) the exercise price for the total number of securities as to which such 
surrendered Rights are exercised and (ii) an amount equal to any applicable 
transfer tax required to be paid by the holder of such Right Certificate in 
accordance with the provisions of Section 9 hereof. In lieu of the cash 
payment referred to in the immediately preceding sentence, following the 
occurrence of a Triggering Event the registered holder of a Right Certificate 
may exercise the Rights evidenced thereby (except as otherwise provided 
herein) in whole or in part upon surrender of the Right Certificate as 
described above together with an election to exercise such Rights without 
payment of cash on the reverse side thereof duly completed. With respect to 
any Rights as to which such an election is made, the holder shall receive a 
number of Common Shares or other securities having a value equal to the 
difference between (i) the value of the Common Shares or other securities 
that would have been issuable upon payment of the cash amount as described 
above, and (ii) the amount of such cash payment. For purposes of this Section 
7(a), the value of any Common Share or other security shall be the current 
per share market price of a Common Share (determined pursuant to Section 
11(d) hereof) on the Trading Day immediately preceding the date of the first 
occurrence of a Triggering Event.  
 
     (b)    Upon receipt of a Right Certificate representing exercisable 
Rights with the form of election to purchase duly executed, accompanied by 
either payment as described above or a duly completed election to exercise 
without payment of cash, the Rights Agent shall promptly (i) requisition from 
any transfer agent of the Common Shares (or make available, if the Rights 
Agent is the transfer agent) certificates representing the number of Common 
Shares to be purchased (and the Company hereby irrevocably authorizes and 
directs its transfer agent to comply with all such requests), (ii) after 
receipt of such certificates, cause the same to be delivered to or upon the 
order of the registered holder of such Right Certificate, registered in such 
name or names as may be designated by such holder, (iii) when appropriate, 
requisition from the Company or any transfer agent therefor (or make 
available, if the Rights Agent is the transfer agent) certificates 
representing the number of equivalent common shares to be issued in lieu of 
the issuance of Common Shares in accordance with the provisions of Section 
11(a)(iii) hereof, (iv) when appropriate, after receipt of such certificates, 
cause the same to be delivered to or upon the order of the registered holder 
of such Right Certificate, registered in such name or names as may be 
designated by such holder, (v) when appropriate, requisition from the Company 
the amount of cash to be paid in lieu of the issuance of fractional shares in 
accordance with the provisions of Section 14 hereof or in lieu of the 
issuance of Common Shares in accordance with the provisions of Section 
11(a)(iii) hereof, (vi) when appropriate, after receipt, deliver such cash to 
or upon the order of the registered holder of such Right Certificate, and 
(vii) when appropriate, deliver any due bill or other instrument provided to 
the Rights Agent by the Company for delivery to the registered holder of such 
Right Certificate as provided by Section 11(l) hereof. 

                                       8
<PAGE>

     (c)    In case the registered holder of any Right Certificate shall 
exercise less than all the Rights evidenced thereby, the Company shall 
prepare, execute and deliver a new Right Certificate evidencing Rights 
equivalent to the Rights remaining unexercised and the Rights Agent shall 
countersign and deliver such new Right Certificate to the registered holder 
of such Right Certificate or to his duly authorized assigns, subject to the 
provisions of Section 14 hereof. 
 
     (d)    Notwithstanding anything in this Agreement to the contrary, 
neither the Rights Agent nor the Company shall be obligated to undertake any 
action with respect to any purported transfer, split up, combination or 
exchange of any Right Certificate pursuant to Section 6 hereof or exercise of 
a Right Certificate as set forth in this Section 7 unless the registered 
holder of such Right Certificate shall have (i) completed and signed the 
certificate following the form of assignment or form of election to purchase, 
as applicable, set forth on the reverse side of the Right Certificate 
surrendered for such transfer, split up, combination, exchange or exercise, 
and (ii) provided such additional evidence of the identity of the Beneficial 
Owner (or former Beneficial Owner) or Affiliates or Associates thereof as the 
Company shall have reasonably requested. 
 
     Section 8.     Cancellation and Destruction of Right Certificates.  All 
Right Certificates surrendered for the purpose of exercise, transfer, split 
up, combination or exchange shall, if surrendered to the Company or to any of 
its stock transfer agents, be delivered to the Rights Agent for cancellation 
or in cancelled form, or, if surrendered to the Rights Agent, shall be 
cancelled by it, and no Right Certificates shall be issued in lieu thereof 
except as expressly permitted by this Agreement. The Company shall deliver to 
the Rights Agent for cancellation and retirement, and the Rights Agent shall 
so cancel and retire, any other Right Certificate purchased or acquired by 
the Company otherwise than upon the exercise thereof. The Rights Agent shall 
deliver all cancelled Right Certificates to the Company, or shall, at the 
written request of the Company, destroy such cancelled Right Certificates, 
and in such case shall deliver a certificate of destruction thereof to the 
Company.
 
     Section 9.     Company Covenants Concerning Securities and Rights.  The 
Company covenants and agrees that:
 
     (a)    So long as the Common Shares issuable upon the exercise of the 
Rights may be listed on a national securities exchange or automated quotation 
system, it shall endeavor to cause, from and after such time as the Rights 
become exercisable, all securities reserved for issuance upon the exercise of 
Rights to be listed on such exchange or automated quotation system upon 
official notice of issuance.
 
     (b)    It shall take all such action as may be necessary to ensure that 
all Common Shares and/or other securities delivered upon exercise of Rights, 
at the time of delivery of the certificates for such securities shall be 
(subject to payment of the Purchase Price) duly and validly authorized and 
issued, fully paid and nonassessable securities.

                                       9
<PAGE>

     (c)    It shall pay when due and payable any and all federal and state 
transfer taxes and charges that may be payable in respect of the issuance or 
delivery of the Right Certificates and of any certificates representing 
securities issued upon the exercise of Rights; provided, however, that the 
Company shall not be required to pay any transfer tax or charge which may be 
payable in respect of any transfer or delivery of Right Certificates to a 
person other than, or the issuance or delivery of certificates representing 
securities issued upon the exercise of Rights in a name other than that of, 
the registered holder of the Right Certificate evidencing Rights surrendered 
for exercise, or to issue or deliver any certificates representing securities 
issued upon the exercise of any Rights until any such tax or charge shall 
have been paid (any such tax or charge being payable by the holder of such 
Right Certificate at the time of surrender) or until it has been established 
to the Company's reasonable satisfaction that no such tax is due.

     (d)    It shall use its best efforts (i) to file on an appropriate form, 
as soon as practicable following the later of the first occurrence of a 
Triggering Event or the Distribution Date, a registration statement under the 
Securities Act with respect to the securities issuable upon exercise of the 
Rights, (ii) to cause such registration statement to become effective as soon 
as practicable after such filing, and (iii) to cause such registration 
statement to remain effective (with a prospectus at all times meeting the 
requirements of the Act) until the earlier of (A) the date as of which the 
Rights are no longer exercisable for such securities and (B) the Expiration 
Date. The Company shall also take such action as may be appropriate under, or 
to ensure compliance with, the securities or "blue sky" laws of the various 
states in connection with the exercisability of the Rights. The Company may 
temporarily suspend, for a period of time after the date set forth in clause 
(i) of the first sentence of this Section 9(d), the exercisability of the 
Rights in order to prepare and file such registration statement and to permit 
it to become effective. Upon any such suspension, the Company shall issue a 
public announcement stating that the exercisability of the Rights has been 
temporarily suspended, as well as a public announcement at such time as the 
suspension is no longer in effect. In addition, if the Company shall 
determine that a registration statement should be filed under the Securities 
Act or any state securities laws following the Distribution Date, the Company 
may temporarily suspend the exercisability of the Rights in each relevant 
jurisdiction until such time as a registration statement has been declared 
effective and, upon any such suspension, the Company shall issue a public 
announcement stating that the exercisability of the Rights has been 
temporarily suspended, as well as a public announcement at such time as the 
suspension is no longer in effect. Notwithstanding anything in this Agreement 
to the contrary, the Rights shall not be exercisable in any jurisdiction if 
the requisite registration or qualification in such jurisdiction shall not 
have been effected or the exercise of the Rights shall not be permitted under 
applicable law.

     (e)    Notwithstanding anything in this Agreement to the contrary, after 
the Distribution Date it shall not, except as permitted by Section 23 or 
Section 26 hereof, take (or permit any Subsidiary to take) any action if at 
the time such action is taken it is reasonably foreseeable that such action 
will eliminate or otherwise diminish the benefits intended to be afforded by 
the Rights. 

                                       10
<PAGE>

     (f)    In the event that the Company is obligated to issue other 
securities of the Company and/or pay cash pursuant to Sections 11, 13 or 14 
hereof, it shall make all arrangements necessary so that such other 
securities and/or cash are available for distribution by the Rights Agent, if 
and when appropriate. 

     Section 10.    Record Date.  Each Person in whose name any certificate 
representing Common Shares is issued upon the exercise of Rights shall for 
all purposes be deemed to have become the holder of record of the Common 
Shares represented thereby on, and such certificate shall be dated, the date 
upon which the Right Certificate evidencing such Rights was duly surrendered 
and payment of the Purchase Price (and all applicable transfer taxes) was 
made; provided, however, that if the date of such surrender and payment is a 
date upon which the Common Shares transfer books of the Company are closed, 
such Person shall be deemed to have become the record holder of such 
securities on, and such certificate shall be dated, the next succeeding 
Business Day on which the Common Shares transfer books of the Company are 
open. Prior to the exercise of the Rights evidenced thereby, the holder of a 
Right Certificate shall not be entitled to any rights of a shareholder of the 
Company with respect to securities for which the Rights shall be exercisable, 
including, without limitation, the right to vote, to receive dividends or 
other distributions or to exercise any preemptive rights, and shall not be 
entitled to receive any notice of any proceedings of the Company, except as 
provided herein. 
 
     Section 11.  Adjustment of Purchase Price, Number and Kind of Securities 
or Number of Rights.  The Purchase Price, the number and kind of securities 
issuable upon exercise of each Right and the number of Rights outstanding are 
subject to adjustment from time to time as provided in this Section 11.

     (a)    (i)     In the event that the Company shall at any time after 
date of this Agreement (A) declare a dividend on the Common Shares payable in 
Common Shares, (B) subdivide the outstanding Common Shares, (C) combine the 
outstanding Common Shares into a smaller number of shares or (D) issue any 
shares of its capital stock in a reclassification of the Common Shares 
(including any such reclassification in connection with a consolidation or 
merger in which the Company is the continuing or surviving corporation), the 
Purchase Price in effect at the time of the record date for such dividend or 
of the effective date of such subdivision, combination or reclassification, 
and/or the number and/or kind of shares of capital stock issuable on such 
date upon exercise of a Right, shall be proportionately adjusted so that the 
holder of any Right exercised after such time shall be entitled to receive 
upon payment of the Purchase Price then in effect the aggregate number and 
kind of shares of capital stock which, if such Right had been exercised 
immediately prior to such date and at a time when the Common Shares transfer 
books of the Company were open, the holder of such Right would have owned 
upon such exercise and been entitled to receive by virtue of such dividend, 
subdivision, combination or reclassification. If an event occurs which would 
require an adjustment under both this Section 11(a)(i) and Section 11(a)(ii) 
hereof or Section 13 hereof, the adjustment provided for in this Section 
11(a)(i) shall be in addition to, and shall be made prior to, any adjustment 
required pursuant to Section 11(a)(ii) or Section 13 hereof. 

                                       11

<PAGE>

     (ii)   Subject to the provisions of Section 27 hereof, in the event 
that: 

            (A)     any Acquiring Person or any Affiliate or Associate of any
     Acquiring Person, at any time after the date of this Agreement, directly or
     indirectly, shall (1) merge into the Company or otherwise combine with the
     Company and the Company shall be the continuing or surviving corporation of
     such merger or combination (other than in a transaction subject to Section
     13 hereof), (2) merge or otherwise combine with any Subsidiary of the
     Company, (3) in one or more transactions (other than in connection with the
     exercise or exchange of Rights or the exercise or conversion of securities
     exercisable for or convertible into shares of any class of capital stock of
     the Company or any of its Subsidiaries) transfer any assets to the Company
     or any of its Subsidiaries in exchange (in whole or in part) for shares of
     any class of capital stock of the Company or any of its Subsidiaries or for
     securities exercisable for or convertible into shares of any class of
     capital stock of the Company or any of its Subsidiaries, or otherwise
     obtain from the Company or any of its Subsidiaries, with or without
     consideration, any additional shares of any class of capital stock of the
     Company or any of its Subsidiaries or securities exercisable for or
     convertible into shares of any class of capital stock of the Company or any
     of its Subsidiaries (other than as part of a pro rata distribution to all
     holders of such shares of any class of capital stock of the Company, or any
     of its Subsidiaries), (4) sell, purchase, lease, exchange, mortgage,
     pledge, transfer or otherwise dispose (in one or more transactions), to,
     from, with or of, as the case may be, the Company or any of its
     Subsidiaries (other than in a transaction subject to Section 13 hereof),
     assets, including securities, on terms and conditions less favorable to the
     Company than the Company would be able to obtain in arm's-length
     negotiation with an unaffiliated third party, (5) receive any compensation
     from the Company or any of its Subsidiaries other than compensation as a
     director or for full-time employment as a regular employee, in either case,
     at rates in accordance with the Company's (or its Subsidiaries') past
     practices, or (6) receive the benefit, directly or indirectly (except
     proportionately as a shareholder), of any loans, advances, guarantees,
     pledges or other financial assistance or any tax credits or other tax
     advantage provided by the Company or any of its Subsidiaries; or 
 
            (B)     during such time as there is an Acquiring Person, there
     shall be any reclassification of securities (including any reverse stock
     split), or recapitalization of the Company, or any merger or consolidation
     of the Company with any of its Subsidiaries or any other transaction or
     series of transactions involving the Company or any of its Subsidiaries
     (whether or not with or into or otherwise involving an Acquiring Person),
     other than a transaction subject to Section 13 hereof, which has the
     effect, directly or indirectly, of increasing by more than 1% the
     proportionate share of the outstanding shares of any class of equity
     securities or of securities exercisable for or convertible into equity
     securities of the Company or any of its Subsidiaries of which an Acquiring
     Person or any Affiliate or Associate of any Acquiring Person, is the
     Beneficial Owner; or 

                                       12
<PAGE>

            (C)     any Person (other than the Company or any Subsidiary of the 
     Company or any employee benefit or stock ownership plan of the Company or
     of any Subsidiary of the Company or any entity holding Common Shares for or
     pursuant to the terms of any such plan) who or which, together with all
     Affiliates and Associates of such Person, shall at any time after the date
     of this Agreement, become the Beneficial Owner of 20% or more of the Common
     Shares then outstanding (other than pursuant to any transaction set forth
     in Section 13(a) hereof); provided, however, that a Person shall not be
     deemed to have become the Beneficial Owner of 20% or more of the Common
     Shares then outstanding for the purposes of this Section 11(a)(ii)(C)
     solely as a result of a reduction in the number of Common Shares
     outstanding unless and until such time as (1) such Person or any Affiliate
     or Associate of such Person shall thereafter become the Beneficial Owner of
     any additional Common Shares other than as a result of a stock dividend,
     stock split or similar transaction effected by the Company in which all
     holders of Common Shares are treated equally, or (2) any other Person who
     is the Beneficial Owner of any Common Shares shall thereafter become an
     Affiliate or Associate of such Person, 

            then, and in each such case, proper provision shall be made so that
     each holder of a Right, except as provided below, shall thereafter have a
     right to receive, upon exercise thereof in accordance with the terms of
     this Agreement at an exercise price per Right equal to the product of the
     then-current Purchase Price multiplied by the number of Common Shares for
     which a Right was exercisable immediately prior to the first occurrence of
     a Triggering Event, such number of Common Shares as shall equal the result
     obtained by (x) multiplying the then-current Purchase Price by the number
     of Common Shares for which a Right was exercisable immediately prior to the
     first occurrence of a Triggering Event, and dividing that product by (y)
     50% of the current per share market price of the Common Shares (determined
     pursuant to Section 11(d) hereof) on the date of the first occurrence of a
     Triggering Event. Notwithstanding anything in this Agreement to the
     contrary, from and after the later of the Distribution Date and the first
     occurrence of a Flip-in Event, (1) any Rights that are or were acquired or
     beneficially owned by any Acquiring Person (or any Affiliate or Associate
     of such Acquiring Person) shall be void and any holder of such Rights shall
     thereafter have no right to exercise such Rights under any provision of
     this Agreement, (2) no Right Certificate shall be issued pursuant to this
     Agreement that represents Rights beneficially owned by an Acquiring Person
     or any Affiliate or Associate thereof, (3) no Right Certificate shall be
     issued at any time upon the transfer of any Rights to an Acquiring Person
     or any Affiliate or Associate thereof or to any nominee of such Acquiring
     Person or Affiliate or Associate thereof, and (4) any Right Certificate
     delivered to the Rights Agent for transfer to an Acquiring Person or any
     Affiliate or Associate thereof shall be cancelled.
 
     (iii)  Upon the occurrence of a Flip-in Event, if there shall not be
sufficient Common Shares authorized but unissued or issued but not outstanding
to permit the 

                                       13
<PAGE>

issuance of all the Common Shares issuable in accordance with subsection (ii) 
hereof upon the exercise of a Right, the Board of Directors of the Company 
shall use its best efforts promptly to authorize and, subject to the 
provisions of Section 9(d) hereof, make available for issuance additional 
Common Shares or other equity securities of the Company having equivalent 
voting rights and an equivalent value (as determined in good faith by the 
Board of Directors of the Company) to the Common Shares (for purposes of this 
Section 11(a)(iii), "equivalent common shares"). In the event that equivalent 
common shares are so authorized, upon the exercise of a Right in accordance 
with the provisions of Section 7 hereof, the registered holder shall be 
entitled to receive (A) Common Shares, to the extent any are available and 
(B) a number of equivalent common shares, which the Board of Directors of the 
Company shall have determined in good faith to have a value equivalent to the 
excess of (x) the aggregate current per share market value of all the Common 
Shares issuable in accordance with subsection (ii) hereof upon the exercise 
of a Right (the "Exercise Value") over (y) the aggregate current per share 
market value of any Common Shares available for issuance upon the exercise of 
such Right; provided, however, that if at any time after 90 calendar days 
after the first occurrence of a Flip-in Event, there shall not be sufficient 
Common Shares and/or equivalent common shares available for issuance upon the 
exercise of a Right, then the Company shall be obligated to deliver, upon the 
surrender of such Right and without requiring payment of the Purchase Price, 
Common Shares (to the extent available), equivalent common shares (to the 
extent available) and then cash (to the extent permitted by applicable law 
and any agreements or instruments to which the Company is a party in effect 
immediately prior to the first occurrence of any Flip-in Event), which 
securities and cash shall have an aggregate value equal to the excess of (1) 
the Exercise Value over (2) the product of the then-current Purchase Price 
multiplied by the number of Common Shares for which a Right was exercisable 
immediately prior to the first occurrence of a Triggering Event. To the 
extent that any legal or contractual restrictions prevent the Company from 
paying the full amount of cash payable in accordance with the foregoing 
sentence, the Company shall pay to holders of the Rights as to which such 
payments are being made all amounts which are not then restricted on a pro 
rata basis and shall continue to make payments on a pro rata basis as funds 
become available until the full amount due to each such Rights holder has 
been paid. 

     (b)    In the event that the Company shall fix a record date for the
issuance of rights, options or warrants to all holders of Common Shares
entitling them (for a period expiring within 45 calendar days after such record
date) to subscribe for or purchase Common Shares (or securities having
equivalent rights, privileges and preferences as the Common Shares (for purposes
of this Section 11(b), "equivalent common shares")) or securities convertible
into Common Shares or equivalent common shares at a price per Common Share or
equivalent common share (or having a conversion price per share, if a security
convertible into Common Shares or equivalent common shares) less than the
current per share market price of the Common Shares (determined pursuant to
Section 11(d) hereof) on such record date, the Purchase Price to be in effect
after such record date shall be determined by multiplying the Purchase Price in
effect immediately prior to such record date by a fraction, the numerator of
which shall be the number of Common Shares outstanding on such record date plus
the number of Common Shares which the aggregate 

                                       14
<PAGE>

offering price of the total number of Common Shares and/or equivalent common 
shares so to be offered (and/or the aggregate initial conversion price of the 
convertible securities so to be offered) would purchase at such current per 
share market price and the denominator of which shall be the number of Common 
Shares outstanding on such record date plus the number of additional Common 
Shares and/or equivalent common shares to be offered for subscription or 
purchase (or into which the convertible securities so to be offered are 
initially convertible). In case such subscription price may be paid in a 
consideration part or all of which shall be in a form other than cash, the 
value of such consideration shall be as determined in good faith by the Board 
of Directors of the Company, whose determination shall be described in a 
statement filed with the Rights Agent. Common Shares owned by or held for the 
account of the Company shall not be deemed outstanding for the purpose of any 
such computation. Such adjustment shall be made successively whenever such a 
record date is fixed; and in the event that such rights, options or warrants 
are not so issued, the Purchase Price shall be adjusted to be the Purchase 
Price which would then be in effect if such record date had not been fixed. 

     (c)    In the event that the Company shall fix a record date for the 
making of a distribution to all holders of Common Shares (including any such 
distribution made in connection with a consolidation or merger in which the 
Company is the continuing or surviving corporation) of evidences of 
indebtedness, cash (other than a regular periodic cash dividend), assets, 
stock (other than a dividend payable in Common Shares) or subscription 
rights, options or warrants (excluding those referred to in Section 11(b) 
hereof), the Purchase Price to be in effect after such record date shall be 
determined by multiplying the Purchase Price in effect immediately prior to 
such record date by a fraction, the numerator of which shall be the current 
per share market price of the Common Shares (as determined pursuant to 
Section 11(d) hereof) on such record date or, if earlier, the date on which 
Common Shares begin to trade on an ex-dividend or when-issued basis for such 
distribution, less the fair market value (as determined in good faith by the 
Board of Directors of the Company, whose determination shall be described in 
a statement filed with the Rights Agent) of the portion of the evidences of 
indebtedness, cash, assets or stock so to be distributed or of such 
subscription rights, options or warrants applicable to one Common Share, and 
the denominator of which shall be such current per share market price of the 
Common Shares. Such adjustments shall be made successively whenever such a 
record date is fixed; and in the event that such distribution is not so made, 
the Purchase Price shall again be adjusted to be the Purchase Price which 
would then be in effect if such record date had not been fixed.

     (d)    For the purpose of any computation hereunder, the "current per 
share market price" of Common Shares on any date shall be deemed to be the 
average of the daily closing prices per share of such Common Shares for the 
30 consecutive Trading Days immediately prior to such date; provided, 
however, that in the event that the current per share market price of the 
Common Shares is determined during a period following the announcement by the 
issuer of such Common Shares of (i) a dividend or distribution on such Common 
Shares payable in such Common Shares or securities convertible into such 
Common Shares (other than the Rights) or (ii) any subdivision, combination or 
reclassification of such Common Shares, and prior to the expiration of 30 
Trading Days 

                                       15
<PAGE>

after the ex-dividend date for such dividend or distribution, or the record 
date for such subdivision, combination or reclassification, then, and in each 
such case, the current per share market price shall be appropriately adjusted 
to take into account ex-dividend trading or to reflect the current per share 
market price per Common Share equivalent. The closing price for each day 
shall be the last sale price, regular way, or, in case no such sale takes 
place on such day, the average of the closing bid and asked prices, regular 
way, in either case as reported in the principal consolidated transaction 
reporting system with respect to securities listed or admitted to trading on 
the New York Stock Exchange or, if the Common Shares are not listed or 
admitted to trading on the New York Stock Exchange, as reported in the 
principal consolidated transaction reporting system with respect to 
securities listed on the principal national securities exchange on which the 
Common Shares are listed or admitted to trading or, if the Common Shares are 
not listed or admitted to trading on any national securities exchange, the 
last quoted price or, if not so quoted, the average of the high bid and low 
asked prices in the over-the-counter market, as reported by NASDAQ or such 
other system then in use, or, if on any such date the Common Shares are not 
quoted by any such organization, the average of the closing bid and asked 
prices as furnished by a professional market maker making a market in the 
Common Shares selected by the Board of Directors of the Company. If the 
Common Shares are not publicly held or not so listed or traded, or not the 
subject of available bid and asked quotes, "current per share market price" 
shall mean the fair value per share as determined in good faith by the Board 
of Directors of the Company, whose determination shall be described in a 
statement filed with the Rights Agent.

     (e)    Except as set forth below, no adjustment in the Purchase Price 
shall be required unless such adjustment would require an increase or 
decrease of at least 1% in such price; provided, however, that any 
adjustments which by reason of this Section 11(e) are not required to be made 
shall be carried forward and taken into account in any subsequent adjustment. 
All calculations under this Section 11 shall be made to the nearest cent or 
to the nearest one ten-thousandth of a Common Share or other security, as the 
case may be. Notwithstanding the first sentence of this Section 11(e), any 
adjustment required by this Section 11 shall be made no later than the 
earlier of (i) three years from the date of the transaction which requires 
such adjustment and (ii) the Expiration Date.

     (f)    If as a result of an adjustment made pursuant to Section 11(a) 
hereof, the holder of any Right thereafter exercised shall become entitled to 
receive any securities of the Company other than Common Shares, thereafter 
the number of such other securities so receivable upon exercise of any Right 
shall be subject to adjustment from time to time in a manner and on terms as 
nearly equivalent as practicable to the provisions with respect to the Common 
Shares contained in this Section 11, and the provisions of Sections 7, 9, 10 
and 13 hereof with respect to the Common Shares shall apply on like terms to 
any such other securities.

     (g)    All Rights originally issued by the Company subsequent to any 
adjustment made to the Purchase Price hereunder shall evidence the right to 
purchase, at the adjusted Purchase Price, the number of Common Shares 
issuable from time to time hereunder upon exercise of the Rights, all subject 
to further adjustment as provided herein.

                                       16
<PAGE>

     (h)    Unless the Company shall have exercised its election as provided 
in Section 11(i) hereof, upon each adjustment of the Purchase Price as a 
result of the calculations made in Section 11(b) and Section 11(c) hereof 
made with respect to a distribution of subscription rights, options or 
warrants applicable to Common Shares, each Right outstanding immediately 
prior to the making of such adjustment shall thereafter evidence the right to 
purchase, at the adjusted Purchase Price, that number of Common Shares 
(calculated to the nearest one-thousandth a Common Share) obtained by (i) 
multiplying (x) the number of Common Shares issuable upon exercise of a Right 
immediately prior to this adjustment by (y) the Purchase Price in effect 
immediately prior to such adjustment of the Purchase Price, and (ii) dividing 
the product so obtained by the Purchase Price in effect immediately after 
such adjustment of the Purchase Price.

     (i)    The Company may elect, on or after the date of any adjustment of 
the Purchase Price, to adjust the number of Rights in substitution for any 
adjustment in the number of Common Shares issuable upon the exercise of a 
Right. Each of the Rights outstanding after such adjustment of the number of 
Rights shall be exercisable for the number of Common Shares for which a Right 
was exercisable immediately prior to such adjustment. Each Right held of 
record prior to such adjustment of the number of Rights shall become that 
number of Rights (calculated to the nearest one-thousandth) obtained by 
dividing the Purchase Price in effect immediately prior to adjustment of the 
Purchase Price by the Purchase Price in effect immediately after adjustment 
of the Purchase Price. The Company shall make a public announcement of its 
election to adjust the number of Rights, indicating the record date for the 
adjustment, and, if known at the time, the amount of the adjustment to be 
made. This record date may be the date on which the Purchase Price is 
adjusted or any day thereafter, but, if the Right Certificates have been 
issued, shall be at least 10 calendar days later than the date of the public 
announcement. If Right Certificates have been issued, upon each adjustment of 
the number of Rights pursuant to this Section 11(i), the Company shall, as 
promptly as practicable, cause to be distributed to holders of record of 
Right Certificates on such record date Right Certificates evidencing, subject 
to the provisions of Section 14 hereof, the additional Rights to which such 
holders shall be entitled as a result of such adjustment, or, at the option 
of the Company, shall cause to be distributed to such holders of record in 
substitution and replacement for the Right Certificates held by such holders 
prior to the date of adjustment, and upon surrender thereof if required by 
the Company, new Right Certificates evidencing all the Rights to which such 
holders shall be entitled after such adjustment. Right Certificates so to be 
distributed shall be issued, executed and countersigned in the manner 
provided for herein (and may bear, at the option of the Company, the adjusted 
Purchase Price) and shall be registered in the names of the holders of record 
of Right Certificates on the record date specified in the public 
announcement. 

     (j)    Irrespective of any adjustment or change in the Purchase Price or 
the number or kind of securities issuable upon the exercise of the Rights, 
the Right Certificates theretofore and thereafter issued may continue to 
express the Purchase Price and the number and kind of securities which were 
expressed in the initial Right Certificate issued hereunder.

                                       17
<PAGE>

     (k)    Before taking any action that would cause an adjustment reducing 
the Purchase Price below the then par value, if any, of the Common Shares or 
other securities issuable upon exercise of the Rights, the Company shall take 
any corporate action which may, in the opinion of its counsel, be necessary 
in order that the Company may validly and legally issue fully paid and 
nonassessable Common Shares or such other securities at such adjusted 
Purchase Price. 

     (l)    In any case in which this Section 11 shall require that an 
adjustment in the Purchase Price be made effective as of a record date for a 
specified event, the Company may elect to defer until the occurrence of such 
event the issuance to the holder of any Right exercised after such record 
date the number of Common Shares or other securities of the Company, if any, 
issuable upon such exercise over and above the number of Common Shares or 
other securities of the Company, if any, issuable upon such exercise on the 
basis of the Purchase Price in effect prior to such adjustment; provided, 
however, that the Company shall deliver to such holder a due bill or other 
appropriate instrument evidencing such holder's right to receive such 
additional Common Shares or other securities upon the occurrence of the event 
requiring such adjustment.

     (m)    Notwithstanding anything in this Agreement to the contrary, the 
Company shall be entitled to make such reductions in the Purchase Price, in 
addition to those adjustments expressly required by this Section 11, as and 
to the extent that in its good faith judgment the Board of Directors of the 
Company shall determine to be advisable in order that any (i) consolidation 
or subdivision of the Common Shares, (ii) issuance wholly for cash of Common 
Shares at less than the current per share market price therefor, (iii) 
issuance wholly for cash of Common Shares or securities which by their terms 
are convertible into or exchangeable for Common Shares, (iv) stock dividends, 
or (v) issuance of rights, options or warrants referred to in this Section 
11, hereafter made by the Company to holders of its Common Shares shall not 
be taxable to such shareholders.

     Section 12.    Certificate of Adjusted Purchase Price or Number of 
Securities.  Whenever an adjustment is made as provided in Section 11 or 
Section 13 hereof, the Company shall promptly (a) prepare a certificate 
setting forth such adjustment and a brief statement of the facts accounting 
for such adjustment, (b) file with the Rights Agent and with each transfer 
agent for the Common Shares, a copy of such certificate, and (c) if such 
adjustment is made after the Distribution Date, mail a brief summary of such 
adjustment to each holder of a Right Certificate in accordance with Section 
25 hereof. 

     Section 13.    Consolidation, Merger or Sale or Transfer of Assets or 
Earning Power.

     (a)    In the event that, following the Share Acquisition Date, directly 
or indirectly:

                                       18
<PAGE>

     (i)    the Company shall consolidate with, or merge with or into, any 
other Person and the Company shall not be the continuing or surviving 
corporation of such consolidation or merger; or

     (ii)   any Person shall consolidate with the Company, or merge with or 
into the Company and the Company shall be the continuing or surviving 
corporation of such merger or consolidation and, in connection with such 
merger or consolidation, all or part of the Common Shares shall be changed 
into or exchanged for stock or other securities of any other Person or cash 
or any other property; or

     (iii)  the Company shall sell or otherwise transfer (or one or more of 
its Subsidiaries shall sell or otherwise transfer), in one or more 
transactions, assets or earning power (including, without limitation, 
securities creating any obligation on the part of the Company and/or any of 
its Subsidiaries) representing in the aggregate more than 50% of the assets 
or earning power of the Company and its Subsidiaries (taken as a whole) to 
any Person or Persons, 

     then, and in each such case, proper provision shall be made so that (A) 
each holder of a Right (except as otherwise provided herein) shall thereafter 
have the right to receive, upon the exercise thereof in accordance with the 
terms of this Agreement at an exercise price per Right equal to the product 
of the then-current Purchase Price multiplied by the number of Common Shares 
for which a Right was exercisable immediately prior to the first occurrence 
of a Triggering Event, such number of validly authorized and issued, fully 
paid, nonassessable and freely tradable Common Shares of the Issuer, free and 
clear of any liens, encumbrances and other adverse claims and not subject to 
any rights of call or first refusal, as shall be equal to the result obtained 
by (x) multiplying the then-current Purchase Price by the number of Common 
Shares for which a Right is exercisable immediately prior to the first 
occurrence of a Triggering Event and dividing that product by (y) 50% of the 
current per share market price of the Common Shares of the Issuer (determined 
pursuant to Section 11(d) hereof), on the date of consummation of such 
Flip-over Event; (B) the Issuer shall thereafter be liable for, and shall 
assume, by virtue of the consummation of such Flip-over Event, all the 
obligations and duties of the Company pursuant to this Agreement; (C) the 
term "Company" shall thereafter be deemed to refer to the Issuer; and (D) the 
Issuer shall take such steps (including, without limitation, the reservation 
of a sufficient number of its Common Shares to permit the exercise of all 
outstanding Rights) in connection with such consummation as may be necessary 
to assure that the provisions hereof shall thereafter be applicable, as 
nearly as reasonably may be possible, in relation to its Common Shares 
thereafter deliverable upon the exercise of the Rights.

     (b)    For purposes of this Section 13, "Issuer" shall mean (i) in the
case of any Flip-over Event described in Sections 13(a) (i) or (ii) above, the
Person that is the continuing, surviving, resulting or acquiring Person
(including the Company as the continuing or surviving corporation of a
transaction described in Section 13(a)(ii) above), and (ii) in the case of any
Flip-over Event described in Section 13(a)(iii) above, the Person that is the
party receiving the greatest portion of the assets or earning power 

                                       19
<PAGE>

(including, without limitation, securities creating any obligation on the 
part of the Company and/or any of its Subsidiaries) transferred pursuant to 
such transaction or transactions; provided, however, that, in any such case, 
(A) if (1) no class of equity security of such Person is, at the time of such 
merger, consolidation or transaction and has been continuously over the 
preceding 12-month period, registered pursuant to Section 12 of the Exchange 
Act, and (2) such Person is a Subsidiary, directly or indirectly, of another 
Person, a class of equity security of which is and has been so registered, 
the term "Issuer" shall mean such other Person; and (B) in case such Person 
is a Subsidiary, directly or indirectly, of more than one Person, a class of 
equity security of two or more of which are and have been so registered, the 
term "Issuer" shall mean whichever of such Persons is the issuer of the 
equity security having the greatest aggregate market value. Notwithstanding 
the foregoing, if the Issuer in any of the Flip-over Events listed above is 
not a corporation or other legal entity having outstanding equity securities, 
then, and in each such case, (x) if the Issuer is directly or indirectly 
wholly owned by a corporation or other legal entity having outstanding equity 
securities, then all references to Common Shares of the Issuer shall be 
deemed to be references to the Common Shares of the corporation or other 
legal entity having outstanding equity securities which ultimately controls 
the Issuer, and (y) if there is no such corporation or other legal entity 
having outstanding equity securities, (I) proper provision shall be made so 
that the Issuer shall create or otherwise make available for purposes of the 
exercise of the Rights in accordance with the terms of this Agreement, a kind 
or kinds of security or securities having a fair market value at least equal 
to the economic value of the Common Shares which each holder of a Right would 
have been entitled to receive if the Issuer had been a corporation or other 
legal entity having outstanding equity securities; and (II) all other 
provisions of this Agreement shall apply to the issuer of such securities as 
if such securities were Common Shares.

     (c)    The Company shall not consummate any Flip-over Event, unless the 
Issuer shall have a sufficient number of authorized Common Shares (or other 
securities as contemplated in Section 13(b) above) which have not been issued 
or reserved for issuance to permit the exercise in full of the Rights in 
accordance with this Section 13 and unless prior to such consummation the 
Company and the Issuer shall have executed and delivered to the Rights Agent 
a supplemental agreement providing for the terms set forth in subsections (a) 
and (b) of this Section 13 and further providing that as promptly as 
practicable after the consummation of any Flip-over Event, the Issuer shall:

     (i)    prepare and file a registration statement under the Securities 
Act, with respect to the Rights and the securities issuable upon exercise of 
the Rights on an appropriate form, and shall use its best efforts to cause 
such registration statement to (A) become effective as soon as practicable 
after such filing and (B) remain effective (with a prospectus at all times 
meeting the requirements of the Securities Act) until the Expiration Date;

     (ii)   take all such action as may be appropriate under, or to ensure 
compliance with, the securities or "blue sky" laws of the various states in 
connection with the exercisability of the Rights; and

                                       20
<PAGE>

     (iii)  deliver to holders of the Rights historical financial statements 
for the Issuer and each of its Affiliates which comply in all respects with 
the requirements for registration on Form 10 under the Exchange Act. 

     (d)    The provisions of this Section 13 shall similarly apply to 
successive mergers or consolidations or sales or other transfers. In the 
event that a Flip-over Event occurs at any time after the occurrence of a 
Flip-in Event, the Rights which have not theretofore been exercised shall 
thereafter become exercisable in the manner described in Section 13(a) 
hereof. 

     Section 14.  Fractional Rights and Fractional Securities. 

     (a)    The Company shall not be required to issue fractions of Rights or 
to distribute Right Certificates which evidence fractional Rights. In lieu of 
such fractional Rights, the Company shall pay as promptly as practicable to 
the registered holders of the Right Certificates with regard to which such 
fractional Rights otherwise would be issuable, an amount in cash equal to the 
same fraction of the current market value of a whole Right. For the purposes 
of this Section 14(a), the current market value of a whole Right shall be the 
closing price of the Rights for the Trading Day immediately prior to the date 
on which such fractional Rights otherwise would have been issuable. The 
closing price for any day shall be the last sale price, regular way, or, in 
case no such sale takes place on such day, the average of the closing bid and 
asked prices, regular way, in either case as reported in the principal 
consolidated transaction reporting system with respect to securities listed 
or admitted to trading on the New York Stock Exchange or, if the Rights are 
not listed or admitted to trading on the New York Stock Exchange, as reported 
in the principal consolidated transaction reporting system with respect to 
securities listed on the principal national securities exchange on which the 
Rights are listed or admitted to trading or, if the Rights are not listed or 
admitted to trading on any national securities exchange, the last quoted 
price or, if not so quoted, the average of the high bid and low asked prices 
in the over-the-counter market, as reported by NASDAQ or such other system 
then in use or, if on any such date the Rights are not quoted by any such 
organization, the average of the closing bid and asked prices as furnished by 
a professional market maker making a market in the Rights selected by the 
Board of Directors of the Company. If on any such date no such market maker 
is making a market in the Rights the fair value of the Rights on such date as 
determined in good faith by the Board of Directors of the Company shall be 
used.

     (b)     The Company shall not be required to issue fractions of Common
Shares or other securities issuable upon exercise or exchange of the Rights or
to distribute certificates which evidence any such fractional securities. In
lieu of issuing any such fractional securities, the Company may pay to any
Person to whom or which such fractional securities would otherwise be issuable
an amount in cash equal to the same fraction of the current market value of one
such security. For purposes of this Section 14(b), the current market value of a
Common Share or other security issuable upon the exercise or exchange of Rights
shall be the closing price thereof (as determined in the 

                                       21
<PAGE>

same manner as set forth for Common Shares in the second sentence of Section 
11(d) hereof) for the Trading Day immediately prior to the date of such 
exercise or exchange; provided, however, that if neither the Common Shares 
nor any such other securities are publicly held or listed or admitted to 
trading on any national securities exchange, or the subject of available bid 
and asked quotes, the current market value of one Common Share or such other 
security shall be determined in good faith by the Board of Directors of the 
Company. 

     Section 15.  Rights of Action.  All rights of action in respect of this 
Agreement, excepting the rights of action given to the Rights Agent under 
Section 18 hereof, are vested in the respective registered holders of the 
Right Certificates (and, prior to the Distribution Date, the registered 
holders of the Common Shares); and any registered holder of any Right 
Certificate (or, prior to the Distribution Date, of the Common Shares), 
without the consent of the Rights Agent or of the holder of any other Right 
Certificate (or, prior to the Distribution Date, of the holder of any Common 
Shares), may in his own behalf and for his own benefit enforce, and may 
institute and maintain any suit, action or proceeding against the Company to 
enforce, or otherwise act in respect of, his right to exercise the Rights 
evidenced by such Right Certificate or Common Share certificate in the manner 
provided in such Right Certificate and in this Agreement. Without limiting 
the foregoing or any remedies available to the holders of Rights, it is 
specifically acknowledged that the holders of Rights would not have an 
adequate remedy at law for any breach of this Agreement and shall be entitled 
to specific performance of the obligations under this Agreement, and 
injunctive relief against actual or threatened violations of the obligations 
of any Person subject to this Agreement.

     Section 16.    Agreement of Rights Holders.  Every holder of a Right by 
accepting the same consents and agrees with the Company and the Rights Agent 
and with every other holder of a Right that:

     (a)    Prior to the Distribution Date, the Rights shall be transferable 
only in connection with the transfer of the Common Shares; 

     (b)    After the Distribution Date, the Right Certificates are 
transferable only on the registry books of the Rights Agent if surrendered at 
the principal office of the Rights Agent designated for such purpose, duly 
endorsed or accompanied by a proper instrument of transfer; 

     (c)    The Company and the Rights Agent may deem and treat the person in 
whose name the Right Certificate (or, prior to the Distribution Date, the 
associated Common Share certificate) is registered as the absolute owner 
thereof and of the Rights evidenced thereby (notwithstanding any notations of 
ownership or writing on the Right Certificate or the associated Common Share 
certificate made by anyone other than the Company or the Rights Agent) for 
all purposes whatsoever, and neither the Company nor the Rights Agent shall 
be affected by any notice to the contrary;

                                       22
<PAGE>

     (d)    Such holder expressly waives any right to receive any fractional 
Rights and any fractional securities upon exercise or exchange of a Right, 
except as otherwise provided in Section 14 hereof; and 

     (e)    Notwithstanding anything in this Agreement to the contrary, 
neither the Company nor the Rights Agent shall have any liability to any 
holder of a Right or other Person as a result of its inability to perform any 
of its obligations under this Agreement by reason of any preliminary or 
permanent injunction or other order, decree or ruling issued by a court of 
competent jurisdiction or by a governmental, regulatory or administrative 
agency or commission, or any statute, rule, regulation or executive order 
promulgated or enacted by any governmental authority, prohibiting or 
otherwise restraining performance of such obligation; provided, however, that 
the Company shall use its best efforts to have any such order, decree or 
ruling lifted or otherwise overturned as soon as possible. 

     Section 17.    Right Certificate Holder Not Deemed a Shareholder.  No 
holder, as such, of any Right Certificate shall be entitled to vote, receive 
dividends or be deemed for any purpose the holder of the Common Shares or any 
other securities of the Company which may at any time be issuable upon the 
exercise of the Rights represented thereby, nor shall anything contained 
herein or in any Right Certificate be construed to confer upon the holder of 
any Right Certificate, as such, any of the rights of a shareholder of the 
Company or any right to vote for the election of directors or upon any matter 
submitted to shareholders at any meeting thereof, or to give or withhold 
consent to any corporate action, or to receive notice of meetings or other 
actions affecting shareholders (except as provided in Section 24 hereof), or 
to receive dividends or subscription rights, or otherwise, until the Right or 
Rights evidenced by such Right Certificate shall have been exercised in 
accordance with the provisions of this Agreement or exchanged pursuant to the 
provisions of Section 27 hereof.

     Section 18.    Concerning the Rights Agent.

     (a)    The Company agrees to pay to the Rights Agent reasonable 
compensation for all services rendered by it hereunder and, from time to 
time, on demand of the Rights Agent, its reasonable expenses and reasonable 
counsel fees and other disbursements incurred in the administration and 
execution of this Agreement and the exercise and performance of its duties 
hereunder. The Company also agrees to indemnify the Rights Agent for, and to 
hold it harmless against, any loss, liability, suit, action, proceeding or 
expense, incurred without gross negligence, bad faith or willful misconduct 
on the part of the Rights Agent, for anything done or omitted by the Rights 
Agent in connection with the acceptance and administration of this Agreement, 
including the costs and expenses of defending against any claim of liability 
arising therefrom, directly or indirectly.

     (b)    The Rights Agent shall be protected and shall incur no liability
for or in respect of any action taken, suffered or omitted by it in connection
with its administration of this Agreement in reliance upon any Right Certificate
or certificate evidencing Common Shares or other securities of the Company,
instrument of assignment or transfer, 

                                       23
<PAGE>

power of attorney, endorsement, affidavit, letter, notice, direction, 
consent, certificate, statement, or other paper or document believed by it to 
be genuine and to be signed, executed and, where necessary, verified or 
acknowledged, by the proper Person or Persons. 

     Section 19.    Merger or Consolidation or Change of Name of Rights 
Agent. 

     (a)    Any corporation into which the Rights Agent or any successor 
Rights Agent may be merged or with which it may be consolidated, or any 
corporation resulting from any merger or consolidation to which the Rights 
Agent or any successor Rights Agent shall be a party, or any corporation 
succeeding to the corporate trust business of the Rights Agent or any 
successor Rights Agent, shall be the successor to the Rights Agent under this 
Agreement without the execution or filing of any paper or any further act on 
the part of any of the parties hereto, provided that such corporation would 
be eligible for appointment as a successor Rights Agent under the provisions 
of Section 21 hereof. In case at the time such successor Rights Agent shall 
succeed to the agency created by this Agreement, any of the Right 
Certificates shall have been countersigned but not delivered, any such 
successor Rights Agent may adopt the countersignature of the predecessor 
Rights Agent and deliver such Right Certificates so countersigned; and in 
case at that time any of the Right Certificates shall not have been 
countersigned, any successor Rights Agent may countersign such Right 
Certificates either in the name of the predecessor Rights Agent or in the 
name of the successor Rights Agent; and in all such cases such Right 
Certificates shall have the full force provided in the Right Certificates and 
in this Agreement.

     (b)    In case at any time the name of the Rights Agent shall be changed 
and at such time any of the Right Certificates shall have been countersigned 
but not delivered, the Rights Agent may adopt the countersignature under its 
prior name and deliver Right Certificates so countersigned; and in case at 
that time any of the Right Certificates shall not have been countersigned, 
the Rights Agent may countersign such Right Certificates either in its prior 
name or in its changed name; and in all such cases such Right Certificates 
shall have the full force provided in the Right Certificates and in this 
Agreement.

     Section 20.  Duties of Rights Agent.  The Rights Agent undertakes the 
duties and obligations imposed by this Agreement upon the following terms and 
conditions, by all of which the Company and the holders of Right 
Certificates, by their acceptance thereof, shall be bound:

     (a)    The Rights Agent may consult with legal counsel (who may be legal 
counsel for the Company), and the opinion of such counsel shall be full and 
complete authorization and protection to the Rights Agent as to any action 
taken or omitted by it in good faith and in accordance with such opinion. 

     (b)    Whenever in the performance of its duties under this Agreement the
Rights Agent shall deem it necessary or desirable that any fact or matter be
proved or established 

                                       24
<PAGE>

by the Company prior to taking or suffering any action hereunder, such fact 
or matter (unless other evidence in respect thereof be herein specifically 
prescribed) may be deemed to be conclusively proved and established by a 
certificate signed by any one of the Chief Executive Officer, the Chief 
Financial Officer or any Vice President of the Company and delivered to the 
Rights Agent; and such certificate shall be full authorization to the Rights 
Agent for any action taken or suffered in good faith by it under the 
provisions of this Agreement in reliance upon such certificate.

     (c)    The Rights Agent shall be liable hereunder only for its own gross 
negligence, bad faith or willful misconduct.

     (d)     The Rights Agent shall not be liable for or by reason of any of 
the statements of fact or recitals contained in this Agreement or in the 
Right Certificates (except its countersignature thereof) or be required to 
verify the same, but all such statements and recitals are and shall be deemed 
to have been made by the Company only.

     (e)    The Rights Agent shall not be under any responsibility in respect 
of the validity of this Agreement or the execution and delivery hereof 
(except the due execution and delivery hereof by the Rights Agent) or in 
respect of the validity or execution of any Right Certificate (except its 
countersignature thereof); nor shall it be responsible for any breach by the 
Company of any covenant or condition contained in this Agreement or in any 
Right Certificate; nor shall it be responsible for any adjustment required 
under the provisions of Section 11 or Section 13 hereof (including any 
adjustment which results in Rights becoming void) or responsible for the 
manner, method or amount of any such adjustment or the ascertaining of the 
existence of facts that would require any such adjustment (except with 
respect to the exercise of Rights evidenced by Right Certificates after 
actual notice of any such adjustment); nor shall it by any act hereunder be 
deemed to make any representation or warranty as to the authorization or 
reservation of any shares of stock or other securities to be issued pursuant 
to this Agreement or any Right Certificate or as to whether any shares of 
stock or other securities will, when issued, be validly authorized and 
issued, fully paid and nonassessable.

     (f)    The Company agrees that it will perform, execute, acknowledge and 
deliver or cause to be performed, executed, acknowledged and delivered all 
such further and other acts, instruments and assurances as may reasonably be 
required by the Rights Agent for the carrying out or performing by the Rights 
Agent of the provisions of this Agreement.

     (g)    The Rights Agent is hereby authorized and directed to accept 
instructions with respect to the performance of its duties hereunder from any 
one of the Chief Executive Officer, the Chief Financial Officer or any Vice 
President of the Company, and to apply to such officers for advice or 
instructions in connection with its duties, and it shall not be liable for 
any action taken or suffered to be taken by it in good faith in accordance 
with instructions of any such officer.

                                       25
<PAGE>

     (h)    The Rights Agent and any shareholder, director, officer or 
employee of the Rights Agent may buy, sell or deal in any of the Rights or 
other securities of the Company or become pecuniarily interested in any 
transaction in which the Company may be interested, or contract with or lend 
money to the Company or otherwise act as fully and freely as though it were 
not Rights Agent under this Agreement. Nothing herein shall preclude the 
Rights Agent from acting in any other capacity for the Company or for any 
other legal entity. 

     (i)    The Rights Agent may execute and exercise any of the rights or 
powers hereby vested in it or perform any duty hereunder either itself or by 
or through its attorneys or agents, and the Rights Agent shall not be 
answerable or accountable for any act, default, neglect or misconduct of any 
such attorneys or agents or for any loss to the Company resulting from any 
such act, default, neglect or misconduct, provided reasonable care was 
exercised in the selection and continued employment thereof. The Rights Agent 
shall not be under any duty or responsibility to insure compliance with any 
applicable federal or state securities laws in connection with the issuance, 
transfer or exchange of Right Certificates.

     (j)    If, with respect to any Right Certificate surrendered to the 
Rights Agent for exercise, transfer, split up, combination or exchange, the 
certificate attached to the form of assignment or form of election to 
purchase, as the case may be, has either not been completed or indicates an 
affirmative response to clause 1 or 2 thereof, the Rights Agent shall not 
take any further action with respect to such requested exercise, transfer, 
split up, combination or exchange, without first consulting with the Company.

     Section 21.    Change of Rights Agent.  The Rights Agent or any 
successor Rights Agent may resign and be discharged from its duties under 
this Agreement upon 30 calendar days' notice in writing mailed to the Company 
and to each transfer agent of the Common Shares by registered or certified 
mail, and to the holders of the Right Certificates by first-class mail. The 
Company may remove the Rights Agent or any successor Rights Agent upon 30 
calendar days' notice in writing, mailed to the Rights Agent or successor 
Rights Agent, as the case may be, and to each transfer agent of the Common 
Shares by registered or certified mail, and to the holders of the Right 
Certificates by first-class mail. If the Rights Agent shall resign or be 
removed or shall otherwise become incapable of acting, the Company shall 
appoint a successor to the Rights Agent. If the Company shall fail to make 
such appointment within a period of 30 calendar days after giving notice of 
such removal or after it has been notified in writing of such resignation or 
incapacity by the resigning or incapacitated Rights Agent or by the holder of 
a Right Certificate (who shall, with such notice, submit his Right 
Certificate for inspection by the Company), then the registered holder of any 
Right Certificate may apply to any court of competent jurisdiction for the 
appointment of a new Rights Agent. Any successor Rights Agent, whether 
appointed by the Company or by such a court, shall be a corporation organized 
and doing business under the laws of the United States or of the States of 

                                       26
<PAGE>

California or New York (or of any other state of the United States so long as 
such corporation is authorized to do business as a banking institution in the 
States of California or New York), in good standing, having a principal 
office in the States of California or New York, which is authorized under 
such laws to exercise corporate trust powers and is subject to supervision or 
examination by federal or state authority and which has at the time of its 
appointment as Rights Agent a combined capital and surplus of at least $50 
million. After appointment, the successor Rights Agent shall be vested with 
the same powers, rights, duties and responsibilities as if it had been 
originally named as Rights Agent without further act or deed; but the 
predecessor Rights Agent shall deliver and transfer to the successor Rights 
Agent any property at the time held by it hereunder, and execute and deliver 
any further assurance, conveyance, act or deed necessary for the purpose. Not 
later than the effective date of any such appointment, the Company shall file 
notice thereof in writing with the predecessor Rights Agent and each transfer 
agent of the Common Shares, and mail a notice thereof in writing to the 
registered holders of the Right Certificates. Failure to give any notice 
provided for in this Section 21, however, or any defect therein, shall not 
affect the legality or validity of the resignation or removal of the Rights 
Agent or the appointment of the successor Rights Agent, as the case may be.

     Section 22.    Issuance of New Right Certificates.  Notwithstanding any 
of the provisions of this Agreement or of the Rights to the contrary, the 
Company may, at its option, issue new Right Certificates evidencing Rights in 
such form as may be approved by its Board of Directors to reflect any 
adjustment or change in the Purchase Price per share and the number or kind 
of securities issuable upon exercise of the Rights made in accordance with 
the provisions of this Agreement. In addition, in connection with the 
issuance or sale by the Company of Common Shares following the Distribution 
Date and prior to the Expiration Date, the Company (a) shall, with respect to 
Common Shares so issued or sold pursuant to the exercise or conversion of 
securities issued prior to the Distribution Date which are exercisable for, 
or convertible into, Common Shares, and (b) may, in any other case, if deemed 
necessary, appropriate or desirable by the Board of Directors of the Company, 
issue Right Certificates representing an equivalent number of Rights as would 
have been issued in respect of such Common Shares if they had been issued or 
sold prior to the Distribution Date, as appropriately adjusted as provided 
herein as if they had been so issued or sold; provided, however, that (i) no 
such Right Certificate shall be issued if, and to the extent that, in its 
good faith judgment the Board of Directors of the Company shall have 
determined that the issuance of such Right Certificate could have a material 
adverse tax consequence to the Company or to the Person to whom or which such 
Right Certificate otherwise would be issued, and (ii) no such Right 
Certificate shall be issued if, and to the extent that, appropriate 
adjustment otherwise shall have been made in lieu of the issuance thereof. 

     Section 23.    Redemption.

     (a)    Prior to the Expiration Date, the Board of Directors of the Company
may, at its option, redeem all but not less than all of the then-outstanding
Rights at the Redemption Price at any time prior to the Close of Business on the
later of (i) the Distribution Date and (ii) the Share Acquisition Date. 

                                       27
<PAGE>

     (b)    Immediately upon the action of the Board of Directors of the 
Company ordering the redemption of the Rights, and without any further action 
and without any notice, the right to exercise the Rights shall terminate and 
the only right thereafter of the holders of Rights shall be to receive the 
Redemption Price. Promptly after the action of its Board of Directors 
ordering the redemption of the Rights, the Company shall publicly announce 
such action, and within 10 calendar days thereafter, the Company shall give 
notice of such redemption to the holders of the then-outstanding Rights by 
mailing such notice to all such holders at their last addresses as they 
appear upon the registry books of the Company; provided, however, that the 
failure to give, or any defect in, any such notice shall not affect the 
validity of the redemption of the Rights. Any notice which is mailed in the 
manner herein provided shall be deemed given, whether or not the holder 
receives the notice. The notice of redemption mailed to the holders of Rights 
shall state the method by which the payment of the Redemption Price will be 
made. The Company may, at its option, pay the Redemption Price in cash, 
Common Shares (based upon the current per share market price of the Common 
Shares (determined pursuant to Section 11(d) hereof) at the time of 
redemption) or any other form of consideration deemed appropriate by the 
Board of Directors of the Company (based upon the fair market value of such 
other consideration, determined by the Board of Directors of the Company in 
good faith) or any combination thereof.

     (c)    At any time following the Share Acquisition Date, the Board of 
Directors of the Company may relinquish the right to redeem the Rights under 
this Section 23 by duly adopting a resolution to that effect. Immediately 
upon adoption of such resolution, the rights of the Board of Directors of the 
Company to redeem the Rights shall terminate without further action and 
without any notice. Promptly after adoption of such a resolution, the Company 
shall publicly announce such action; provided, however, that the failure to 
give, or any defect in, any such notice shall not affect the validity of the 
action of the Board of Directors of the Company.

     Section 24.    Notice of Certain Events.

     (a)    In case, after the Distribution Date, the Company shall propose 
(i) to pay any dividend payable in stock of any class to the holders of 
Common Shares or to make any other distribution to the holders of Common 
Shares (other than a regular periodic cash dividend), (ii) to offer to the 
holders of Common Shares rights, options or warrants to subscribe for or to 
purchase any additional Common Shares or shares of stock of any class or any 
other securities, rights or options, (iii) to effect any reclassification of 
its Common Shares (other than a reclassification involving only the 
subdivision of outstanding Common Shares), (iv) to effect any consolidation 
or merger into or with, or to effect any sale or other transfer (or to permit 
one or more of its Subsidiaries to effect any sale or other transfer), in one 
or more transactions, of assets or earning power (including, without 
limitation, securities creating any obligation on the part of the Company 
and/or any of its Subsidiaries) representing more than 50% of the assets and 
earning power of the Company and its Subsidiaries, taken as a whole, to any 
other Person or Persons, or (v) to effect the liquidation, dissolution or 
winding up of the Company, then, in each such case, the Company shall give to 
each holder of a Right Certificate, in 

                                       28
<PAGE>

accordance with Section 25 hereof, a notice of such proposed action, which 
shall specify the record date for the purposes of such stock dividend, 
distribution or offering of rights, options or warrants, or the date on which 
such reclassification, consolidation, merger, sale, transfer, liquidation, 
dissolution, or winding up is to take place and the date of participation 
therein by the holders of the Common Shares, if any such date is to be fixed, 
and such notice shall be so given, in the case of any action covered by 
clause (i) or (ii) above, at least 10 calendar days prior to the record date 
for determining holders of the Common Shares for purposes of such action, 
and, in the case of any such other action, at least 10 calendar days prior to 
the date of the taking of such proposed action or the date of participation 
therein by the holders of the Common Shares, whichever shall be the earlier.

     (b)    In case any Triggering Event shall occur, then, in any such case, 
the Company shall as soon as practicable thereafter give to the Rights Agent 
and each holder of a Right Certificate, in accordance with Section 25 hereof, 
a notice of the occurrence of such event, which shall specify the event and 
the consequences of the event to holders of Rights.

     Section 25.    Notices.

     (a)    Notices or demands authorized by this Agreement to be given or 
made by the Rights Agent or by the holder of any Right Certificate to or on 
the Company shall be sufficiently given or made if sent by first-class mail, 
postage prepaid, addressed (until another address is filed in writing with 
the Rights Agent) as follows:

          North American Scientific, Inc.
          7435 Greenbush Avenue
          North Hollywood, CA 91605
          Attention: L. Michael Cutrer
 
     (b)    Subject to the provisions of Section 21 hereof, any notice or 
demand authorized by this Agreement to be given or made by the Company or by 
the holder of any Right Certificate to or on the Rights Agent shall be 
sufficiently given or made if sent by first-class mail, postage prepaid, 
addressed (until another address is filed in writing with the Company) as 
follows:

          U.S. Stock Transfer Corporation
          1745 Gardena Avenue
          Glendale, CA  91204
          Attention: Mark H. Cano
          Assistant Vice President

     (c)    Notices or demands authorized by this Agreement to be given or made
by the Company or the Rights Agent to the holder of any Right Certificate (or,
if prior to the Distribution Date, to the holder of any certificate evidencing
Common Shares) shall be 

                                       29
<PAGE>

sufficiently given or made if sent by first-class mail, postage prepaid, 
addressed to such holder at the address of such holder as shown on the 
registry books of the Company.

     Section 26.    Supplements and Amendments.  Prior to the Distribution 
Date and subject to the last sentence of this Section 26, if the Company so 
directs, the Company and the Rights Agent shall supplement or amend any 
provision of this Agreement without the approval of any holders of 
certificates representing Common Shares. From and after the Distribution Date 
and subject to the last sentence of this Section 26, if the Company so 
directs, the Company and the Rights Agent shall supplement or amend this 
Agreement without the approval of any holders of Right Certificates in order 
(i) to cure any ambiguity, (ii) to correct or supplement any provision 
contained herein which may be defective or inconsistent with any other 
provisions herein, (iii) to shorten or lengthen any time period hereunder, or 
(iv) to supplement or amend the provisions hereunder in any manner which the 
Company may deem desirable, including, without limitation, the addition of 
other events requiring adjustment to the Rights under Sections 11 or 13 
hereof or procedures relating to the redemption of the Rights, which 
supplement or amendment shall not, in the good faith determination of the 
Board of Directors of the Company, adversely affect the interests of the 
holders of Right Certificates (other than an Acquiring Person or an Affiliate 
or Associate of an Acquiring Person so long as the duties, liabilities and 
indemnifications of the Rights Agent are not affected). Upon the delivery of 
a certificate from an officer of the Company which states that the proposed 
supplement or amendment is in compliance with the terms of this Section 26, 
the Rights Agent shall execute such supplement or amendment; provided, 
however, that the failure or refusal of the Rights Agent to execute such 
supplement or amendment shall not affect the validity of any supplement or 
amendment adopted by the Company, any of which shall be effective in 
accordance with the terms thereof. Notwithstanding anything in this Agreement 
to the contrary, no supplement or amendment shall be made which decreases the 
stated Redemption Price or the period of time remaining until the Final 
Expiration Date or which modifies a time period relating to when the Rights 
may be redeemed at such time as the Rights are not then redeemable.

     Section 27.    Exchange.

     (a)    The Board of Directors of the Company may, at its option, at any 
time after the later of the Distribution Date and the first occurrence of a 
Triggering Event, exchange all or part of the then-outstanding and 
exercisable Rights (which shall not include Rights that have become void 
pursuant to the provisions of Section 11(a)(ii) hereof) for Common Shares at 
an exchange ratio of one Common Share per Right, appropriately adjusted to 
reflect any stock split, stock dividend or similar transaction occurring 
after the date hereof (such exchange ratio being hereinafter referred to as 
the "Exchange Ratio"). Notwithstanding the foregoing, the Board of Directors 
shall not be empowered to effect such exchange at any time after any Person 
(other than the Company, any Subsidiary of the Company, any employee benefit 
plan of the Company or any such Subsidiary, or any entity holding Common 
Shares for or pursuant to the terms of any such plan), who or which, together 
with all Affiliates and Associates of such Person, becomes the Beneficial 
Owner of 50% or more of the Common Shares then outstanding.

                                       30
<PAGE>

     (b)    Immediately upon the action of the Board of Directors of the 
Company ordering the exchange of any Rights pursuant to Section 27(a) hereof, 
and without any further action and without any notice, the right to exercise 
such Rights shall terminate and the only right with respect to such Rights 
thereafter of the holder of such Rights shall be to receive that number of 
Common Shares equal to the number of such Rights held by such holder 
multiplied by the Exchange Ratio. Promptly after the action of the Board of 
Directors of the Company ordering the exchange of any Rights pursuant to 
Section 27(a) hereof, the Company shall publicly announce such action, and 
within 10 calendar days thereafter shall give notice of any such exchange to 
all of the holders of such Rights at their last addresses as they appear upon 
the registry books of the Rights Agent; provided, however, that the failure 
to give, or any defect in, such notice shall not affect the validity of such 
exchange. Any notice which is mailed in the manner herein provided shall be 
deemed given, whether or not the holder receives the notice. Each such notice 
of exchange shall state the method by which the exchange of the Common Shares 
for Rights will be effected and, in the event of any partial exchange, the 
number of Rights which will be exchanged. Any partial exchange shall be 
effected pro rata based on the number of Rights (other than Rights which have 
become void pursuant to the provisions of Section 11(a)(ii) hereof) held by 
each holder of Rights.

     (c)    In any exchange pursuant to this Section 27, the Company, at its 
option, may substitute for any Common Share exchangeable for a Right, (i) 
equivalent common shares (as such term is used in Section 11(a)(iii) hereof), 
(ii) cash, (iii) debt securities of the Company, (iv) other assets, or (v) 
any combination of the foregoing, in any event having an aggregate value 
which the Board of Directors of the Company shall have determined in good 
faith to be equal to the current market value of one Common Share (determined 
pursuant to Section 11(d) hereof) on the Trading Day immediately preceding 
the date of exchange pursuant to this Section 27. 

     Section 28.    Successors; Certain Covenants.  All the covenants and 
provisions of this Agreement by or for the benefit of the Company or the 
Rights Agent shall bind and inure to the benefit of their respective 
successors and assigns hereunder.

     Section 29.    Benefits of this Agreement.  Nothing in this Agreement 
shall be construed to give to any Person other than the Company, the Rights 
Agent and the registered holders of the Right Certificates (and, prior to the 
Distribution Date, the Common Shares) any legal or equitable right, remedy or 
claim under this Agreement; but this Agreement shall be for the sole and 
exclusive benefit of the Company, the Rights Agent and the registered holders 
of the Right Certificates (or prior to the Distribution Date, the Common 
Shares). 

     Section 30.    Determinations and Actions by the Board of Directors, etc. 
The Board of Directors of the corporation shall have the exclusive power and
authority to administer this Agreement and to exercise all rights and powers
specifically granted to the Board, or the corporation, or as may be necessary or
advisable in the administration of this Agreement, including, without
limitation, the right and power to (i) interpret the 

                                       31
<PAGE>

provisions of this Agreement, and (ii) make all determinations deemed 
necessary or advisable for the administration of this Agreement (including, 
without limitation, a determination to redeem or not redeem the Rights or to 
amend the Agreement, whether a Person is an Acquiring Person and whether any 
proposed amendment adversely affects the interests of the holders of Right 
Certificates). For all purposes of this Agreement, any calculation of the 
number of Common Shares or other securities outstanding at any particular 
time, including for purposes of determining the particular percentage of such 
outstanding Common Shares or any other securities of which any Person is the 
Beneficial Owner, shall be made in accordance with the last sentence of Rule 
13d-3(d)(1)(i) under the Exchange Act as in effect on the date of this 
Agreement. All such actions, calculations, interpretations and determinations 
(including, for purposes of clause (y) below, all omissions with respect to 
the foregoing) which are done or made by the board in good faith, shall (x) 
be final, conclusive and binding on the Corporation, the Rights Agent, the 
holders of the Right Certificates and all other parties, and (y) not subject 
the Board to any liability to the holders of the Right Certificates.

     Section 31.    Severability.  If any term, provision, covenant or 
restriction of this Agreement is held by a court of competent jurisdiction or 
other authority to be invalid, void or unenforceable, the remainder of the 
terms, provisions, covenants and restrictions of this Agreement shall remain 
in full force and effect and shall in no way be affected, impaired or 
invalidated. 

     Section 32.    Governing Law.  This Agreement and each Right Certificate 
issued hereunder shall be deemed to be a contract made under the internal 
substantive laws of the State of Delaware and for all purposes shall be 
governed by and construed in accordance with the internal substantive laws of 
such State applicable to contracts to be made and performed entirely within 
such State. 

     Section 33.    Counterparts.  This Agreement may be executed in any 
number of counterparts and each of such counterparts shall for all purposes 
be deemed to be an original, and all such counterparts shall together 
constitute but one and the same instrument.

     Section 34.    Descriptive Headings.  Descriptive headings of the several
Sections of this Agreement are inserted for convenience only and shall not
control or affect the meaning or construction of any of the provisions hereof. 

                                       32
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed and attested, all as of the day and year first above written.

Attest:                            NORTH AMERICAN SCIENTIFIC, INC.


By:  /s/ Alan I. Edrick            By:  /s/ L. Michael Cutrer
   -----------------------------      ---------------------------------
     Alan I. Edrick                     L. Michael Cutrer
     Chief Financial Officer            President and Chief Executive Officer



                                   U.S. STOCK TRANSFER
Attest:                            CORPORATION


By:  /s/ Richard Brown             By:  /s/ Mark H. Cano
   -----------------------------      ---------------------------------
     Richard Brown                      Mark H. Cano
     Senior Vice President              Assistant Vice President

                                       33
<PAGE>

                                                           EXHIBIT A 

Form of Right Certificate
Certificate No. R-                                              _______ Rights

NOT EXERCISABLE AFTER OCTOBER 22, 2008 OR EARLIER IF REDEEMED. THE RIGHTS ARE 
SUBJECT TO REDEMPTION, AT THE OPTION OF THE COMPANY, AT $0.001 PER RIGHT ON 
THE TERMS SET FORTH IN THE RIGHTS AGREEMENT. UNDER CERTAIN CIRCUMSTANCES 
SPECIFIED IN THE RIGHTS AGREEMENT, RIGHTS BENEFICIALLY  OWNED BY AN ACQUIRING 
PERSON OR AN AFFILIATE OR AN ASSOCIATE OF AN ACQUIRING PERSON (AS SUCH TERMS 
ARE DEFINED IN THE RIGHTS AGREEMENT) MAY BECOME NULL AND VOID.

Right Certificate

NORTH AMERICAN SCIENTIFIC, INC.    

This certifies that                , or registered assigns, is the registered 
owner of the number of Rights set forth above, each of which entitles the 
owner thereof, subject to the terms, provisions and conditions of the Rights 
Agreement, dated as of October 12, 1998 (the "Rights Agreement"), between 
North American Scientific, Inc., a Delaware corporation (the "Company"), and 
U.S. Stock Transfer Corporation, a California corporation (the "Rights 
Agent"), to purchase from the Company at any time after the Distribution Date 
(as such term is defined in the Rights Agreement) and prior to 5:00 P.M. 
(Pacific time) on October 22, 2008 at the principal office or offices of the 
Rights Agent designated for such purpose, one fully paid nonassessable share 
of common stock, par value $.01 per share (the "Common Shares"), of the 
Company, at a purchase price of $80.00 per Common Share (the "Purchase 
Price"), upon presentation and surrender of this Right Certificate with the 
Form of Election to Purchase and related Certificate duly executed. If this 
Right Certificate shall be exercised in part, the holder shall be entitled to 
receive upon surrender hereof another Right Certificate or Right Certificates 
for the number of whole Rights not exercised. The number of Rights evidenced 
by this Right Certificate (and the number of Common Shares which may be 
purchased upon exercise thereof) set forth above, and the Purchase Price set 
forth above, are the number and Purchase Price as of October 22, 1998 based 
on the Common Shares as constituted at such date. 

     As provided in the Rights Agreement, the Purchase Price and the number 
and kind of securities issuable upon the exercise of the Rights evidenced by 
this Right Certificate are subject to adjustment upon the happening of 
certain events.

     This Right Certificate is subject to all of the terms, provisions and
conditions of the Rights Agreement, which terms, provisions and conditions are
hereby incorporated herein by reference and made a part hereof and to which
Rights Agreement reference is

                                       A-1
<PAGE>

hereby made for a full description of the rights, limitations of rights, 
obligations, duties and immunities of the Rights Agent, the Company and the 
holders of the Right Certificates, which limitations of rights include the 
temporary suspension of the exercisability of the Rights under the 
circumstances specified in the Rights Agreement. Copies of the Rights 
Agreement are on file at the above-mentioned office of the Rights Agent. 

     Pursuant to the Rights Agreement, from and after the later of the 
Distribution Date and the first occurrence of a Flip-in Event (as such term 
is defined in the Rights Agreement), (i) any Rights that are or were acquired 
or beneficially owned by any Acquiring Person (or any Affiliate or Associate 
of such Acquiring Person) shall be void and any holder of such Rights shall 
thereafter have no right to exercise such Rights under any provision of the 
Rights Agreement, (ii) no Right Certificate shall be issued pursuant to the 
Rights Agreement that represents Rights beneficially owned by an Acquiring 
Person or any Affiliate or Associate thereof, (iii) no Right Certificate 
shall be issued at any time upon the transfer of any Rights to an Acquiring 
Person or any Affiliate or Associate thereof or to any nominee of such 
Acquiring Person or Affiliate or Associate thereof, and (iv) any Right 
Certificate delivered to the Rights Agent for transfer to an Acquiring Person 
or any Affiliate or Associate thereof shall be cancelled.

     This Right Certificate, with or without other Right Certificates, may be 
transferred, split up, combined or exchanged for another Right Certificate or 
Right Certificates, entitling the holder to purchase a like number of Common 
Shares (or other securities, as the case may be) as the Right Certificate or 
Right Certificates surrendered shall have entitled such holder (or former 
holder in the case of a transfer) to purchase, upon presentation and 
surrender hereof at the principal office of the Rights Agent designated for 
such purpose, with the Form of Assignment (if appropriate) and the related 
Certificate duly executed.

     Subject to the provisions of the Rights Agreement, the Rights evidenced 
by this Certificate may be redeemed by the Company at its option at a 
redemption price of $0.001 per Right. The Rights Agreement may be 
supplemented and amended by the Company, as provided therein.

     The Company is not required to issue fractional Common Shares or other 
securities issuable upon the exercise of any Right or Rights evidenced 
hereby. In lieu of issuing such fractional Common Shares or other securities, 
the Company may make a cash payment, as provided in the Rights Agreement. 

     No holder of this Right Certificate, as such, shall be entitled to vote or
receive dividends or be deemed for any purpose the holder of the Common Shares
or of any other securities of the Company which may at any time be issuable upon
the exercise of the Right or Rights represented hereby, nor shall anything
contained herein or in the Rights Agreement be construed to confer upon the
holder hereof, as such, any of the rights of a shareholder of the Company or any
right to vote for the election of directors or upon any matter submitted to
shareholders at any meeting thereof, or to give or withhold consent to 

                                       A-2
<PAGE>

any corporate action, or to receive notice of meetings or other actions 
affecting shareholders (except as provided in the Rights Agreement), or to 
receive dividends or subscription rights, or otherwise, until the Right or 
Rights evidenced by this Right Certificate shall have been exercised in 
accordance with the provisions of the Rights Agreement.

     This Right Certificate shall not be valid or obligatory for any purpose 
until it shall have been countersigned by the Rights Agent.

     WITNESS the facsimile signature of the proper officers of the Company 
and its corporate seal. Dated as of          , ____.



ATTEST                                  NORTH AMERICAN SCIENTIFIC, INC.



_____________________________           By:______________________________
                                             Title:
Assistant Secretary

[SEAL]

Countersigned:
U.S. STOCK TRANSFER CORPORATION



By:___________________________
     Authorized Signature

                                       A-3
<PAGE>

Form of Reverse Side of Right Certificate

FORM OF ASSIGNMENT

(To be executed by the registered holder if such 
holder desires to transfer the Right Certificate)

     FOR VALUE RECEIVED, ______________________________________________ 

hereby sells, assigns and transfers unto_______________________________ 

_______________________________________________________________________

(Please print name and address of transferee)

_______________________________________________________________________

this Right Certificate, together with all right, title and interest therein, and
does hereby irrevocably constitute and appoint _______________  Attorney, to
transfer the within Right Certificate on the books of the within-named Company,
with full power of substitution.

Dated:                     , __

                                             _______________________________
                                                       Signature 

Signature Guaranteed:


CERTIFICATE

The undersigned hereby certifies by checking the appropriate boxes that: 

     (1)    the Rights evidenced by this Right Certificate [ ] are [ ] are not
being sold, assigned, transferred, split up, combined or exchanged by or on
behalf of a Person who is or was an Acquiring Person or an Affiliate or
Associate of any such Person (as such terms are defined in the Rights
Agreement);

     (2)    after due inquiry and to the best knowledge of the undersigned, 
it [  ] did [  ] did not acquire the Rights evidenced by this Right 
Certificate from any Person who is, was or became an Acquiring Person or an 
Affiliate or Associate of an Acquiring Person.

Dated:                       , ____

                                             _______________________________
                                                       Signature

                                       A-4
<PAGE>

FORM OF ELECTION TO PURCHASE
(To be executed if holder desires to
exercise the Right Certificate)

To North American Scientific, Inc.

The undersigned hereby irrevocably elects to exercise ____________ Rights
represented by this Right Certificate to purchase the Common Shares or other
securities issuable upon the exercise of such Rights and requests that
certificates for such securities be issued in the name of:

Please insert social security or other identifying number:

_____________________________________________________________________________

(Please print name and address)

_____________________________________________________________________________

If such number of Rights shall not be all the Rights evidenced by this Right
Certificate, a new Right Certificate for the balance remaining of such Rights
shall be registered in the name of and delivered to:

Please insert social security or other identifying number:

_____________________________________________________________________________

(Please print name and address)

_____________________________________________________________________________

Optional Election to Exercise without Payment of Cash:

     With respect to the exercise of ____________ of the Rights specified above,
the undersigned hereby elects to exercise such Rights without payment of cash
and to receive a number of Common Shares or other securities having a value (as
determined pursuant to the Rights Agreement) equal to the difference between (i)
the value of the Common Shares or other securities that would have been issuable
upon the exercise thereof upon payment of the cash amount as provided in the
Rights Agreement, and (ii) the amount of such cash payment.

Dated:                     , ____
                                             ___________________________________
                                                          Signature

Signature Guaranteed:

                                       A-5
<PAGE>

CERTIFICATE

The undersigned hereby certifies by checking the appropriate boxes that: 

     (1) the Rights evidenced by this Right Certificate [       ] are [       ]
are not being exercised by or on behalf of a Person who is or was an Acquiring
Person or an Affiliate or Associate of any such Person (as such terms are
defined pursuant to the Rights Agreement); 

     (2) after due inquiry and to the best knowledge of the undersigned, it 
[     ] did [       ] did not acquire the Rights evidenced by this Right 
Certificate from any Person who is, was or became an Acquiring Person or an 
Affiliate or Associate of an Acquiring Person.

Dated:             , ____

                                             ________________________________
                                                        Signature

NOTICE

     Signatures on the foregoing Form of Assignment and Form of Election to 
Purchase and in the related Certificates must correspond to the name as 
written upon the face of this Right Certificate in every particular, without 
alteration or enlargement or any change whatsoever.

     Signatures must be guaranteed by a member firm of a registered national 
securities exchange, a member of the National Association of Securities 
Dealers, Inc., or a commercial bank or trust company having an office or 
correspondent in the United States. 

                                       A-6
<PAGE>

                                                           EXHIBIT B

SUMMARY OF RIGHTS TO PURCHASE
COMMON SHARES

     The Board of Directors of North American Scientific, Inc. (the 
"Company") has declared a dividend distribution of one right (a "Right") for 
each outstanding share of common stock, par value $.01 per share (the "Common 
Shares"), of the Company. The distribution is payable on October 22, 1998 
(the "Record Date") to the shareholders of record as of the close of business 
on the Record Date. Each Right entitles the registered holder to purchase 
from the Company one Common Share at a price of $80.00 (the "Purchase 
Price"), subject to adjustment. The description and terms of the Rights are 
set forth in a Rights Agreement, dated as of October 12, 1998 (the "Rights 
Agreement"), between the Company and U.S. Stock Transfer Corporation as 
Rights Agent (the "Rights Agent"). 

     Until the earliest to occur of (i) the close of business on the tenth 
calendar day (or such later date as may be specified by the Board of 
Directors) following a public announcement that a person or group of 
affiliated or associated persons has acquired, or obtained the right to 
acquire, beneficial ownership of 15% or more of the outstanding Common Shares 
(an "Acquiring Person"), (ii) the close of business on the tenth calendar day 
following the commencement of a tender offer or exchange offer by a person or 
group of affiliated or associated persons, the consummation of which would 
result in beneficial ownership by such person or group of 15% or more of the 
outstanding Common Shares, or (iii) the close of business on the tenth 
calendar day following the first date of public announcement of the first 
occurrence of a Flip-in Event or a Flip-over Event (as such terms are 
hereinafter defined) (the earliest of such dates being hereinafter called the 
"Distribution Date"), the Rights will be evidenced, with respect to any of 
the Common Share certificates outstanding as of the Record Date, by such 
Common Share certificates. 

     The Rights Agreement provides that, until the Distribution Date, the 
Rights will be transferred with and only with the Common Shares. Until the 
Distribution Date (or earlier redemption or expiration of the Rights), new 
Common Share certificates issued after the Record Date upon transfer or new 
issuance of Common Shares will contain a notation incorporating the Rights 
Agreement by reference. Until the Distribution Date (or earlier redemption or 
expiration of the Rights), the surrender for transfer of any certificates for 
Common Shares in respect of which Rights have been issued will also 
constitute the transfer of the Rights associated with the Common Shares 
represented by such certificates. As soon as practicable following the 
Distribution Date, separate certificates evidencing the Rights (the "Right 
Certificates") will be mailed to holders of record of the Common Shares of 
the close of business on the Distribution Date and such separate Right 
Certificates alone will evidence the Rights. 

     No Right is exercisable at any time prior to the Distribution Date. The 
Rights will expire on October 22, 2008 (the "Final Expiration Date") unless 
earlier redeemed or exchanged by the Company as described below. Until a 
Right is exercised, the holder thereof, as such, will have no rights as a 
shareholder of the Company, including without limitation the right to vote or 
to receive dividends.

                                       B-1
<PAGE>

     The Purchase Price payable, and the number of Common Shares or other 
securities issuable, upon exercise of the Rights are subject to adjustment 
from time to time to prevent dilution (i) in the event of a stock dividend 
on, or a subdivision, combination or reclassification of, the Common Shares, 
(ii) upon the grant to holders of the Common Shares of certain rights or 
warrants to subscribe for or purchase Common Shares at a price, or securities 
convertible into Common Shares with a conversion price, less than the then 
current market price of the Common Shares or (iii) upon the distribution to 
holders of the Common Shares of evidences of indebtedness or cash (excluding 
regular periodic cash dividends), assets, stock (excluding dividends payable 
in Common Shares) or of subscription rights or warrants (other than those 
referred to above). 

     In the event (a "Flip-in Event") that (i) any person or group of 
affiliated or associated persons becomes the beneficial owner of 20% or more 
of the outstanding Common Shares, (ii) any Acquiring Person merges into or 
combines with the Company and the Company is the surviving corporation or any 
Acquiring Person effects certain other transactions with the Company, as 
described in the Rights Agreement, or (iii) during such time as there is an 
Acquiring Person, there shall be any reclassification of securities or 
recapitalization or reorganization of the Company which has the effect of 
increasing by more than 1% the proportionate share of the outstanding shares 
of any class of equity securities of the Company or any of its subsidiaries 
beneficially owned by the Acquiring Person, proper provision shall be made so 
that each holder of a Right, other than Rights that are or were owned 
beneficially by the Acquiring Person (which, from and after the later of the 
Distribution Date and the date of the earliest of any such events, will be 
void), will thereafter have the right to receive, upon exercise thereof at 
the then current exercise price of the Right, that number of Common Shares 
(or, under certain circumstances, an economically equivalent security or 
securities of the Company) having a market value of two times the exercise 
price of the Right.

     To illustrate the operation of such an adjustment, at a Purchase Price 
of $80.00, assuming the current market price (as determined pursuant to the 
provisions of the Rights Agreement) per Common Share were $20.00, each Right 
not owned beneficially by an Acquiring Person at or after the time of such an 
occurrence would entitle its holder to purchase (after the Distribution Date) 
from the Company 8 Common Shares (having a market value of $160.00) for 
$80.00.

     In the event (a "Flip-over Event") that, following the first date of 
public announcement that a person has become an Acquiring Person, (i) the 
Company merges with or into any person and the Company is not the surviving 
corporation, (ii) any person merges with or into the Company and the Company 
is the surviving corporation, but its Common Shares are changed or exchanged, 
or (iii) 50% or more of the Company's assets or earning power, including 
without limitation securities creating obligations of the Company, are sold, 
proper provision shall be made so that each holder of a Right will thereafter 
have the right to receive, upon the exercise thereof at the then current 
exercise price of the Right, that number of shares of common stock (or, under 
certain circumstances, an economically equivalent security or securities) of 
such other person which at the time of such transaction would have a market 
value of two times the exercise price of the Right.

                                       B-2
<PAGE>

     At any time after the later of the Distribution Date and the first 
occurrence of a Flip-in Event or Flip-over Event and prior to the acquisition 
by any person or group of affiliated or associated persons of 50% or more of 
the outstanding Common Shares, the Board of Directors of the Company may 
exchange the Rights (other than any Rights which have become void), in whole 
or in part, at an exchange ratio of one Common Share per Right (subject to 
adjustment). 

     With certain exceptions, no adjustment in the Purchase Price will be 
required until cumulative adjustments require an adjustment in the Purchase 
Price of at least 1%. The Company is not required to issue fractional Common 
Shares or other securities issuable upon the exercise of Rights. In lieu of 
issuing such securities, the Company may make a cash payment, as provided in 
the Rights Agreement.

     The Company may redeem the Rights in whole, but not in part, at a price 
of $0.001 per Right (the "Redemption Price"), at any time prior to the close 
of business on the later of (i) the Distribution Date and (ii) the first date 
of public announcement that a person has become an Acquiring Person. 
Immediately upon any redemption of the Rights, the right to exercise the 
Rights will terminate and the only right of the holders of Rights will be to 
receive the Redemption Price.

     The Rights Agreement may be amended by the Company without the approval 
of any holders of Right Certificates, including amendments which add other 
events requiring adjustment to the purchase price payable and the number of 
Common Shares or other securities issuable upon the exercise of the Rights or 
which modify procedures relating to the redemption of the Rights, provided 
that no amendment may be made which decreases the stated Redemption Price or 
the period of time remaining until the Final Expiration Date or which 
modifies a time period relating to when the Rights may be redeemed at such 
time as the Rights are not then redeemable.

     A copy of the Rights Agreement has been filed with the Securities and 
Exchange Commission as an Exhibit to a Registration Statement on Form 8-A. A 
copy of the Rights Agreement is available free of charge from the Company. 
This summary description of the Rights is as of October 12, 1998, does not 
purport to be complete and is qualified in its entirety by reference to the 
Rights Agreement, which is incorporated herein by this reference.

                                       B-3



<PAGE>

EXHIBIT 99.2

Form of Letter to Stockholders
dated October 22, 1998

To Our Stockholders:

     On October 12, 1998 your Board of Directors voted to protect your 
investment in North American Scientific, Inc. (the "Company") by adopting a 
Stockholders Rights Plan (the "Plan").  The Plan is similar to the rights 
plans adopted by many other public companies. This letter, and the enclosed 
summary, describe the Plan and the Board's reasons for adopting it.
     
     The Plan is designed to deter unfair or coercive takeover attempts in a 
manner or on terms that the Board determines not to be in the best interest 
of our stockholders.  Pursuant to the Plan, each holder  of record on October 
22, 1998 of the Company's Common Stock has received a dividend of one right 
(a "Right") for each share of Common Stock owned by it on that date.  Until a 
takeover of the Company is attempted, the Rights are not exercisable and have 
no independent value.  Generally speaking, in the event of a takeover attempt 
which is not approved by the Board, the Rights will entitle all stockholders 
(other than the stockholder(s) initiating the takeover attempt) to purchase 
shares of the Company or, in certain cases, the shares of the company making 
the takeover attempt at a 50% discount to the then-current market price.
     
     The Rights are not being distributed  in response to any specific effort 
to acquire control of the Company and the Board is not aware of any such 
effort. The Plan increases your Board's ability to represent the interests of 
stockholders effectively in the event of coercive or unfair unsolicited 
takeover attempts, such as two-tiered tender offers that do not treat all 
stockholders fairly and open-market or other purchases of shares leading to 
the acquisition of control without offering fair value to all stockholders.  
The Board considers the Plan to be one of the best available means of 
protecting the value of your investment in the Company.
     
     The Plan does not and is not intended to prevent a takeover of the 
Company. Rather, it provides a strong incentive for the potential acquirer to 
negotiate with the Board prior to attempting a takeover of the Company.  The 
Rights may be redeemed by the Company at $.001 per Right within ten days 
after the time that 15% or more of the shares of the Company's Common Stock 
have been accumulated by a person or group.  Thus, the Plan will not 
interfere with any merger or other business combination approved by the Board.
     
     The Plan does not in any way weaken the financial strength of the 
Company or interfere with our business plans.  The initial issuance of the 
Rights has no dilutive effect, does not affect earnings per share, is not 
taxable to the Company or to you and will not change the way in which you can 
presently trade the Company's Common Stock.  As explained below, the Rights 
will only become exercisable if and when there is an attempted takeover of 
the Company.
     
     The Rights will expire in ten years.  Initially, the Rights will not be 
exercisable, certificates for the Rights will not be sent to you (Rights 
Certificates will be sent to you when the Rights become exercisable) and the 
Rights will automatically trade with the Common Stock.

                                       1
<PAGE>

     In adopting the Plan, we have expressed our confidence in the Company's
future growth and our determination that you, our stockholders, be given every
opportunity to participate fully in that growth.
     
On Behalf of the Board of Directors,


___________________________________
L. Michael Cutrer
President and Chief Executive Officer

                                       2


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