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Exhibit 10.6    
    

 
 

Lock-Up Agreement    
    

North
American Scientific, Inc.

20200 Sunburst Avenue

Chatworth, California

Attn: 

Re:
NOMOS Corporation 

Ladies
and Gentlemen: 

        The
undersigned is an owner of record of certain shares of capital stock of NOMOS Corporation, a Delaware corporation (the "Company"), or securities convertible into or exercisable for
shares of capital stock of the Company ("Company Capital Stock"). North American Scientific, Inc., a Delaware corporation (the
"Acquiror"), and the Company are parties to an Agreement and Plan of Merger, dated as of October 26, 2003 (the "Merger Agreement"),
pursuant to which the shares of Company Capital Stock held by the undersigned are to be converted into the right to receive, as consideration or a portion of the consideration for such shares of
Company Capital Stock, shares of common stock, par value $0.01 per share, of the Acquiror (the "Acquiror Common Stock"), in accordance with the terms of the Merger
Agreement. Capitalized terms that are used but not defined in this Agreement are used herein as defined in the Merger Agreement. 

        In
connection with and in consideration of the foregoing, the undersigned hereby agrees that the undersigned will not offer to sell, contract to sell, or sell, dispose of, loan, pledge
or grant any rights with respect to any shares of Acquiror Common Stock (any such transaction or action being referred to herein as a "Disposition") acquired in connection with the transactions
contemplated by the Merger Agreement or any options or warrants to purchase any shares of Acquiror Common Stock acquired in
connection with the transactions contemplated by the Merger Agreement (collectively, "Securities") without the prior written consent of Acquiror, for a period commencing
on the Closing Date and continuing until the date that is [545] [365] [180] days after the Closing Date (the
"Lock-Up Period").[; provided, that, the undersigned may engage in any Disposition with respect to any Securities held by the undersigned which
have been registered under the Securities Act of 1933, as amended, pursuant to that certain Registration Rights Agreement
dated                        , 2003 by and among the Acquiror and the other parties
thereto][;provided, further, that during the period that is ninety (90) days after the Closing Date until the expiration of the Lock-Up Period (the "Interim
Period"), the undersigned may engage in any such Disposition with respect to up to twenty-five percent (25%) of the Securities held by the undersigned at any time and from time to time
during the Interim Period.] 

        In
addition, the undersigned expressly agrees that the undersigned may not, during the Lock-Up Period, engage in any hedging or other transaction which is designed to or
could reasonably be expected to lead to or result in a Disposition of Securities, irrespective of whether such Securities would be disposed of by someone other than the undersigned. Such prohibited
hedging or other transaction would include, without limitation, any short sale (whether or not against the box) or any purchase, sale or grant of any right (including, without limitation, any put or
call option) with respect to any Securities or with respect to any security (other than a broad-based market basket or index) that included, relates to or derives any significant part of its value
from Securities. 

        Notwithstanding
anything contain in the foregoing to the contrary, the undersigned may sell, contract to sell, or sell, dispose of, or otherwise transfer for value or otherwise, the
Securities (i) as a bona fide gift or gifts, provided that the donee or donees thereof agree to be bound by the restrictions set forth herein or (ii) to members of the undersigned's
immediate family or to any trust for the direct or indirect benefit of the undersigned or the immediate family of the undersigned, provided that the transferees thereof agree to be bound by the
restrictions set forth herein. For purposes of this Lock-Up Agreement, "immediate family" shall mean (i) the undersigned; (ii) any spouse, lineal descendant or antecedent,
father, mother, brother or sister of the undersigned and (iii) any estate, trust, guardianship, custodianship or other fiduciary arrangement for the primary benefit of any one or more
individuals named or described in (i) and (ii) above. 

        The
undersigned also agrees and consents to the entry of stop transfer instructions with the Acquiror's transfer agent and registrar against the transfer of shares of Acquiror Common
Stock or other Securities acquired in connection with the transactions contemplated by the Merger Agreement held by the undersigned except in compliance with the foregoing restrictions. Acquiror,
acting alone and in its sole discretion, may waive any provisions of this Lock-Up Agreement without notice to any third party. 

        This
Lock-Up Agreement is irrevocable and will be binding on the undersigned and the respective successors, heirs, personal representatives and assigns of the undersigned. 

        This
Lock-Up Agreement shall automatically terminate on the earlier of (i) the expiration of the Lock-Up Period or (ii) such time as the Merger
Agreement is terminated in accordance with its terms. 

	 	 	Very truly yours,
	

 	
 	

 Exact Name of Stockholder
	

 	
 	

 Authorized Signature
	

 	
 	

 [Title] [FOR ENTITIES ONLY]

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Exhibit 10.6

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Exhibit 10 (i)    
    

	STATE OF NORTH CAROLINA	 	AMENDMENT TO

EMPLOYMENT AGREEMENT
	COUNTY OF MECKLENBURG	 	 

        THIS
AMENDMENT, made and entered into effective the 31st day of August 2003, by and between FAMILY DOLLAR STORES, INC., a Delaware corporation (hereinafter referred to as
the "Company"); and Howard R. Levine (hereinafter referred to as the "Employee"); 

W
I T N E S S E T H: 

        WHEREAS,
the Company and the Employee entered into an Employment Agreement dated April 29, 1997, as amended by Amendments to Employment Agreement dated August 28, 1997,
August 19, 1998, August 29, 1999, August 27, 2000, September 2, 2001, September 1, 2002, and January 16, 2003, (hereinafter referred to as the "Agreement");
and 

        WHEREAS,
the Company and the Employee desire to amend the Agreement; 

        NOW,
THEREFORE, in consideration of the mutual covenants herein contained, the Company and the Employee agree as follows: 

	1.
	Section 1.04
of the Agreement is amended by adding "North Dakota" and "Wyoming" to the list of states constituting the "Present Territory."

	2.
	Section 2
of the Agreement is deleted and the following is substituted in lieu thereof: 

        "2.    Employment.    The
Employee shall be employed by the Company and any Affiliate in the capacity provided for in Paragraph 3
for the period commencing August 31, 2003, (the "Commencement Date"), and ending on August 28, 2004, or upon the termination of this Agreement as provided in Paragraph 6." 

	3.
	The
first paragraph of Section 5.01 of the Agreement is deleted and the following paragraph is substituted in lieu thereof: 

        "5.01    In
consideration of the services to be rendered by the Employee pursuant to this Agreement, the Company shall pay, or cause to be paid, to the Employee a weekly base
salary from August 31, 2003, to August 28, 2004, of $13,942.31 ($725,000.00 per annum)." 

	4.
	Subparagraphs
(a) and (b) of Section 5.02 of the Agreement are deleted and the following subparagraphs are substituted in lieu thereof: 

        "5.02.    In
addition, the Employee shall be entitled to: 

        (a)    Participate
in the Company's Target Bonus Plan, as it may be amended or modified in any respect, including achievement of established goals, as Chairman and Chief
Executive Officer for the fiscal year commencing August 31, 2003. The Target Bonus Plan generally will give the Employee the opportunity to earn a bonus of up to one hundred (100%) percent of
the Employee's base salary actually received for services on and after August 31, 2003, through August 28, 2004, for the fiscal year ending August 28, 2004, subject to the
Company's achievement of certain financial goals to be established, the Employee's performance, and all terms and conditions of the Target Bonus Plan as in effect for such fiscal year; provided that
the amount of bonus paid may not be increased by the annual individual performance rating of the Employee. The Employee acknowledges that he has received a copy of the form of the Target Bonus Plan
and Bonus Conditions and is familiar with the terms and conditions thereof. Nothing contained herein shall limit the Company's right to alter, amend or terminate the Target Bonus Plan at any time for
any reason. The Employee further acknowledges that, as provided in the Target Bonus Plan, in the event the Employee is not employed by the Company, for whatever reason, at the time the bonus for the
fiscal year is actually paid to 

 

participants
in the Target Bonus Plan following the end of the fiscal year, the Employee will not be entitled to receive the bonus. 

        (b)    Take
twenty days (exclusive of Saturdays, Sundays and paid Company holidays) of vacation during the twelve month period commencing August 31, 2003. Vacation time
will accrue ratably during the course of said period and cannot be accumulated from year to year, except that up to five days of vacation not taken in said twelve month period may be carried over to
the next twelve month period." 

	5.
	The
second paragraph of Section 6.02 of the Agreement is deleted and the following paragraph is substituted in lieu thereof: 

        "In
the event this Agreement is not terminated by the Company or the Employee for any reason prior to August 28, 2004, and the Company and the Employee do not agree in writing
before August 28, 2004, to extend the term of this Agreement beyond August 28, 2004, or to enter into a new agreement to extend the employment relationship beyond August 28, 2004,
this Agreement shall terminate automatically on August 28, 2004, which shall be the Termination Date, and the Company shall pay to the Employee sixty (60) days of the base salary set
forth in Section 5.01 (which shall constitute payment in full of the compensation due to the Employee hereunder). Any such payments shall be made in two (2) equal monthly installments
with the first installment due and payable not later than thirty (30) days after the Termination Date." 

	6.
	Section 6A.
of the Agreement is deleted, and the following Section is added in lieu thereof: 

        "6A.    Target
Bonus Plan. Notwithstanding any other provision of this Agreement, if the Company terminates this Agreement prior to the end of the
term of this Agreement on August 28, 2004, for reasons other than for Cause, or if the Company and the Employee do not agree in writing before August 28, 2004, to extend the term of the
Employee's employment by the Company beyond August 28, 2004, the Employee shall be entitled to receive as a severance payment an amount equal to the pro rata share of the bonus, or the full
bonus,as the case may be, if any, under and subject to the terms and conditions of the Target Bonus Plan referred to in Section 5.02(a) based on one hundred (100%) percent of the Employee's
base salary actually received for the period from August 31, 2003, through the Termination Date, or through August 28, 2004, if the Employee's employment continues through that date.
This payment is equal to the amount, if any, the Employee would have received following the end of the fiscal year ended August 28, 2004, if the Target Bonus Plan did not have a requirement
that the Employee be employed by the Company at the time the bonus is customarily paid. Such payment shall be made to the Employee on or about November 15 following the end of said fiscal
year." 

	7.
	All
other terms and provisions of the Agreement shall remain in full force and effect. 

2

 

IN
WITNESS WHEREOF, the parties hereto have executed this Agreement in triplicate, all as of the day and year first above written. 

	 	 	FAMILY DOLLAR STORES, INC.
	

Attest	
 	

By	
 	

/s/  R. JAMES KELLY      
 Vice Chairman
	/s/  GEORGE R. MAHONEY, JR.      
 Secretary	 	 	 	 
	

(Corporate Seal)	
 	

 	
 	

 
	 	 	 	 	/s/  HOWARD R. LEVINE      
 Howard R. Levine
	Witness:	 	 	 	 
	

/s/  ALICE R. BARRIER      
	
 	

 	
 	

 

3

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Exhibit 10 (i)

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