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Exhibit 10.26    
    

[Logo
of National Research Council of Canada] 

Date
drafted: 27 March 2000 Case Number: 11104 

GIVEN BY NATIONAL RESEARCH COUNCIL OF CANADA (called "NRC")

Head {1200 Montreal Road, Participating Institute for National Office {Ottawa, Ontario KIA OR6 Institute Measurement Standards 

TO
NOMOS Corporation (called the "User") whose address is:

2591 Wexford Bayne Road

Sewickley, PA 15143

U.S.A. 

PREAMBLE

The
User desires to use computer software created by NRC and identified as BEAM 99 (called herein the "Software"). 

IN
CONSIDERATION of the preamble and the terms below, the Parties agree as follows: 

SL-1    TITLE AND GRANT    

NRC
grants to the User, and User accepts, a non-transferable, non-exclusive licence to use the Software only in the manner described under the
heading "USAGE". All proprietary interest, right, title, and copyright in the Software remain with NRC. 

SL-2    TERM    

This
Licence is in effect until 31 December, 2000 ("Initial Term"). Thereafter, the User will have the right to continue this licence for one year periods upon payment of the annual licence fee, which
is due on the expiration of the Initial Term and each anniversary thereof. 

SL-3    PAYMENTS BY THE USER    

The
User must pay an initial licence fee of Thirty thousand U.S. Dollars ($ 30,000.00) upon execution of this agreement. Thereafter, to continue this licence, the User must pay an annual licence fee
of Thirty thousand United States Dollars ($30,000.00) as set out in SL-2. Neither the initial licence fee or the annual licence fees are refundable. 

Invoices
will not be sent. The User must remit payment with the executed agreement. Cheques are to be made out to "Receiver General—National Research Council". Customs duties, if
applicable, will be paid by the User. 

Cheques
must be addressed to: 

Finance
and Information Management Services National Research Council

1200 Montreal Road, Ottawa, Ontario, KIA OR6 

The
case number 11104 should be noted on the check. 

SL-4    USAGE    

        4.1   The
User may install the software on an unlimited number of workstations located solely at the Users address at 2591 Wexford Bayne Road, Sewickley, PA 15143, U.S.A.. NRC
agrees that the software may also be installed on the workstations of the Users contractor, Lawrence Livermore National Laboratory (LLNL) located solely at 7000 East Avenue, Livermore CA 945550, USA
provided that LLNL certifies in writing that it agrees to be bound by the terms and conditions of this licence. (letter attached) 

 

        4.2   Subject
to clause 4.3, the User may not lease, sublicense, sell or transfer the Software or create and lease, sublicense, sell or transfer any derivative programs
that incorporate, embody or are derived in any way from the Software. 

        4.3   The
User may only use the software for internal work to develop beam characterization models for generic accelerators which it may incorporate into its Peregfine related
treatment planning software and provide to third parties. The User agrees not to use the Software to provide services or data to third parties which are in any way based on modelling any third party's
individual accelerator. 

        4.4   The
Software constitutes valuable trade secrets which are provided to the User for the sole internal use of the User and which must not be made available to any other
person. 

        4.5   NRC
agrees to provide, when available, any corrections, bug fixes and updates of the Software to the User under this licence. However, access to a new version of the
Software (for example BEAMOO) is not included and shall be the subject of a separate licence. 

        4.6   This
licence does not include the fight to use the EGS4 Software and the User is responsible for independently obtaining all necessary authorizations for such use. 

SL-5.    TERMINATION PROCEDURE    

        5.1   The
User may terminate this licence at any time, by notifying NRC in writing. NRC may terminate this licence by notifying the User if the User violates any term of this
Agreement and the violation is not corrected to the satisfaction of NRC within thirty (30) days after NRC gives the User notice in writing of the allegation of a violation. 

        5.2   Immediately
upon notice of termination by either the User or NRC, the User must certify that no copies, portions, modified versions, or translations of the Software
remain accessible to the User, and that none have been passed from the User to third parties. 

        5.3   Termination
by either the User or NRC does not erase any debt already due pursuant to this Agreement. 

SL-6    LIMITED WARRANTY AND REMEDIES    

        6.1   NRC
makes no warranty with respect to the accuracy of the software code. NRC will use its best efforts to attempt to correct any minor defects reported by the User to
NRC. NRC will not provide any technical assistance or support under this licence but, at its discretion, will respond to minor requests from the User. The provision of any other support or technical
services will be the subject of a separate agreement between the parties. 

        6.2   NRC
warrants that the Software does not infringe any copyright or violate any obligation of confidentiality. NRG also warrants that NRC is not actually aware of any
patent which may be infringed by the Software. If a breach of a warranty mentioned in this paragraph is proved in a court, NRC will cancel all debts owing and refund all payments made pursuant to this
Agreement within the three (3) years preceding the commencement of the court action. 

        6.3   EXCEPT
AS EXPRESSLY STATED HEREIN, NRG DISCLAIMS ANY WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, OF ANY KIND OR NATURE WITH RESPECT TO THE SOFTWARE, INCLUDING WITHOUT
LIMITATION ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. NRC SHALL NOT BE LIABLE IN ANY EVENT FOR ANY DAMAGES, WHETHER DIRECT OR INDIRECT, SPECIAL OR GENERAL, CONSEQUENTIAL OR
INCIDENTAL, ARISING FROM THE USE OF THE SOFTWARE. 

2

 

SL-7    GENERAL    

        7.1   This
Agreement supersedes all prior communications, negotiations and agreements, written or oral, concerning the Software. No amendment or waiver of terms is effective
unless it is in writing, signed by both Parties, and specifically states the intention to affect this Agreement. 

SIGNED
by the User in duplicate at   Sewickley, PA   

	

NOMOS CORPORATION	
 	

 	
 	

 
	

 	
 	

Date:	
 	

3-28-00
	 	 	 	 	

	

John W. Manzetti Executive Vice President and Chief Financail Officer NOMOS Corporation
	

 	
 	

per:	
 	

/s/ JOHN W. MANZETTI
	 	 	 	 	
 Print name and title
	

SIGNED by NRC in duplicate at Ottawa, Ontario, Canada:
	
NATIONAL RESEARCH COUNCIL OF CANADA
	 	 	Date:	 	 
	 	 	 	 	

	

 	
 	

per:	
 	

 
	 	 	 	 	

	 	 	 	 	Print name and title

3

 

Letter to be signed by NOMOS and LLNL. Copy to be returned to NRC with the executed agreement. 

Date:

Mr. Ralph
Patterson

Lawrence Livermore National Laboratory

7000 East Avenue, L-051

Livermore, California 94550 

Dear
Mr. Patterson: 

As
our contractor for the PEREGRINE project under the terms of Work for others Agreement L-8788, NOMOS is furnishing you a copy of BEAM99 for use in performing the required tasks of this
agreement. BEAM99 is owned by the National Research Council of Canada, and licensed by NOMOS for the purposes of developing beam characterization models for generic accelerators. The license
specifically excludes providing services or data to third parties which are in any way based on modeling any third party's individual accelerator. 

By
cosigning this letter, Lawrence Livermore National Laboratory agrees to use this software solely in accordance with the terms of the National Research Council licence in performing agreement
L-8788, and that it will return the software when requested by NOMOS. 

Signed, 

Robert
M. Oates, Vice President Engineering NOMOS Corporation 

Agreed, 

Ralph
W. Patterson, Product Manager

Lawrence Livermore National Laboratory 

4

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Exhibit 10.27    
    

NOMOS
CORPORATION

2591 Wexford Bayne Road

Sewickley, PA 15143 

February 11,
2002 

John
Friede

One Shore Road

Rye, NY 10580 

Dear
John: 

        NOMOS
Corporation (the "Company") considers it essential to the best interests of its stockholders to foster the continuous employment of key management personnel. 

        In
order to induce you to remain in the employ of the Company, the Company agrees that you shall receive the severance benefits set forth in this letter agreement (the "Agreement"). This
benefit replaces and supersedes the benefits set forth in that certain letter agreement dated June 30, 2000, between you and the Company, which prior agreement is deemed null and void. 

        1.    Severance.    Subject to Section 3 of this letter, you will receive a severance payment equal to twelve
months of your base salary and medical benefits in the event your employment with the Company is terminated at any time after this agreement. 

        2.    Payment Terms.    The severance payment contemplated by this Agreement shall be payable in cash in a single lump
sum within seven days after the termination of your employment except as noted below. 

        3.    Severance Terms.    The severance shall be payable to you if your employment with the Company is terminated,
unless such termination is (a) because of your death or Disability; (b) by the Company for Cause; or (c) by you for other than Good Reason. 

        4.    Disability.    If, as a result of your incapacity due to physical or mental illness, you shall have been absent
from the full-time performance of your duties with the Company for six (6) consecutive months, and within thirty (30) days after written notice of termination is given you
shall not have returned to the full-time performance of your duties, your employment maybe terminated for "Disability." 

        5.    Cause.    Termination by the Company of your employment for "Cause" shall mean termination (a) upon the
willful and continued failure by you to substantially perform your duties with the Company (other than any such failure resulting from your incapacity due to physical or mental illness), after a
written demand for substantial performance is delivered to you by the Board, or (b) the willful engaging by you in conduct which is demonstrably and materially injurious to the Company,
monetarily or otherwise. For purposes of this Section, no act, or failure to act, on your part shall be deemed "willful" unless done, or omitted to be done, by you not in good faith and without
reasonable belief that your action or omission was in the best interest of the Company. 

        6.    Good Reason.    You shall be entitled to terminate your employment for Good Reason. For purposes of this
Agreement, "Good Reason" shall mean the occurrence of: 

        (a)   the
assignment to you of any material duties inconsistent (unless in the nature of a promotion) with the position in the Company that you hold, or a significant adverse
reduction or alteration in the nature or status of your position, duties, status or responsibilities or the conditions of your employment; 

        (b)   a
reduction by the Company in your annual base salary as the same may be increased from time to time, except for across-the-board salary
reductions similarly affecting all management personnel of the Company; and 

 

        (c)   the
Company's requiring you to be based more than 50 miles from the location at which you were based, except for required travel on the Company's business to an extent
substantially consistent with your present business travel obligations. 

        7.    Successors; Binding Agreement.    (i) The Company will require any successor (whether direct or
indirect, by purchase, merger, consolidation or otherwise) to all or substantially all of the business and/or assets of the Company to expressly assume and agree to perform this Agreement in the same
manner and to the same extent that the Company would be required to perform it if no such succession had taken place. 

         (ii)  This
Agreement shall inure to the benefit of and be enforceable by you and your personal or legal representatives, executors, administrators, successors, heirs,
distributees, devisees and legatees. 

        8.    Miscellaneous.    No provision of this Agreement may be modified, waived or discharged unless such waiver,
modification or discharge is agreed to in writing and signed by you and such officer as may be specifically designated by the Board. No waiver by either party hereto at any time of any breach by the
other party hereto of, or compliance with, any condition or provision of this Agreement to be performed by such other party shall be deemed a waiver of similar or dissimilar provisions or conditions
at the same or at any prior or subsequent time. No agreements or representations, oral or otherwise, express or implied, with respect to the subject matter hereof have been made by either party which
are not expressly set forth in this Agreement. The validity, interpretation, construction and performance of this Agreement shall be governed by the laws of the Commonwealth of Pennsylvania without
regard to its conflicts of law principles. 

        9.    Validity.    The invalidity or unenforceability of any provision of this Agreement shall not affect the validity
or enforceability of any other provision of this Agreement, which shall remain in full force and effect. 

        10.    Counterparts.    This Agreement may be executed in several counterparts, each of which shall be deemed to be an
original but all of which together will constitute one and the same instrument. 

        11.    Entire Agreement.    This Agreement sets forth the entire agreement of the parties hereto in respect of the
subject matter contained herein and supersedes all prior agreements, Promises, covenants, arrangements, communications, representations or warranties, whether oral or written, by any officer, employee
or representative of any party hereto; and any prior agreement of the parties hereto in respect of the subject matter contained herein is hereby terminated and cancelled. 

        If
this letter sets forth our agreement on the subject matter hereof, kindly sign and return to the Company the enclosed copy of this letter, which will then constitute our agreement on
this subject. 

	 	 	Sincerely,
	

 	
 	

NOMOS CORPORATION
	

 	
 	

By:	

/s/  JOHN W. MANZETTI      

	 	 	Name: John W. Manzetti

Title. President and Chief Executive Officer
	

Agreed to this 28th day of March, 2003	
 	

 	

 
	

/s/  JOHN A. FRIEDE      
 Name: John A. Friede	
 	

 	

 

2

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Exhibit 10.27

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