Document:

CONFIDENTIAL TREATMENT REQUESTED: CONFIDENTIAL PORTIONS OF THIS DOCUMENT
     HAVE BEEN REDACTED AND HAVE BEEN FILED SEPARATELY WITH THE COMMISSION.

INTEROFFICE MEMO

TO:               Fred Marroni

FROM:             John Manzetti

Subject:          2002 Compensation Plan

Date:             December 17, 2001

CC:               Jill Welch

Dear Fred,

This letter is to confirm and to outline the components of your compensation
plan for 2002 as Vice President of Engineering and Development for NOMOS
Corporation.

Effective January 1, 2002 your annual base salary will be increased to $175,000,
a $10,000, or 6.1% increase over your current annual base salary of $165,000.
Your new anniversary date will not be January 1. Your compensation plan will
also include an annual bonus opportunity of $100,000, up from $75,000 in 2001.

As we discussed, for 2002, your incentive plan opportunity will be as follows:

         Personal and Department Objectives:
                  $40,000 will be earned on your achievement of personal and
                  department objectives we will agree upon, which will provide
                  Sales and Marketing with needed features and functionality in
                  a timely, and cost effective manner.

         Company Financial Performance:
                  $30,000 will be earned if the Company meets its base 2002
                  Financial Plan, yet to finalized by the Compensation Committee
                  of the Board of Directors.

                  $30,000 will be earned if the Company exceeds its base 2001
                  Financial Plan targets, yet to finalized by the Compensation
                  Committee of the Board of Directors.

Your total Compensation opportunity for 2002 is:

         Base Salary at 1/1/02 (annualized)            $   175,000
         Personal & Department Objectives                   40,000
         Company Financial performance                      60,000
                                                        ----------
         Total at 100% achievement                     $   275,000

Any bonus amount earned will be paid within 45 days after the financial closing
of fiscal year 2002 and no later than February 28, 2003

Any discrepancies will be discussed individually, and with your input, and after
consideration of all factors, I will decide on the final resolution.

Fred, I really enjoy working with you to solve problems and strategize on new
business opportunities. Let's do it again and again.

Best regards,

John

<PAGE>

                            [NOMOS Corporation Logo]

Mr. Fred Marroni
9892 Mocassin Trail
Wexford, PA 15090

                                                  July 2, 2001

Dear Fred,

This letter is to confirm and outline the components of you compensation plan
for 2001 as Vice President of Engineering, and an officer of NOMOS Corporation,
reporting to me.

Your annual base salary will be $165,000 and will be paid semi-monthly effective
on you start date, which I hope is on or before August 1, 2001. Your
compensation plan will also include an annual bonus opportunity of $75,000. This
incentive opportunity will be prorated on your start date, and if that date is
August 1, 2001, you will be eligible to earn 5/12ths of you annualized bonus
opportunity as follows:

         Personal and Department Objectives:
                  $10,417 (5/12ths of $25,000) will be earned on your
                  achievement of personal and department objectives we will
                  agree upon during the first 30 days of your employment.

         Company Financial Performance:
                  $10,417 (5/12ths of $25,000) will be earned if the Company
                  meets its base 2001 Financial Plan targets of $[* * *] in
                  revenue and $[* * *] in operating income.

                  $10,417 (5/12ths of $25,000) will be earned if the Company
                  exceeds its base 2001 Financial Plan targets, and achieves
                  revenue of $[* * *] and operating income of $[* * *].

In addition, 100,000 incentive stock options will be granted to you on your
start date. These options vest equally over a three-year period as per the terms
of the 2001 NOMOS Corporation Stock Option Plan. This Plan is designed to reward
you handsomely for increased Company valuation.

Any performance bonus amount earned will be paid within 60 days after the
financial closing of fiscal year 2001 and no later than February 28, 2002.

You will also receive a $15,000 one-time signing bonus, which will be paid at
the end of your first 30 days of employment. Should you terminate your
employment with NOMOS voluntarily within 12 months of your start date, this
bonus is to be repaid to NOMOS Corporation immediately upon your termination and
may be withheld from or netted against any final pay due to you at that time.

--------------------------
***Confidential material redacted and filed separately with the Commission.

<PAGE>

Your total annualized compensation package is then $240,000, not including the
one-time bonus opportunity.

You will also receive employee benefits, which include:
                  A fully paid comprehensive medical/detntal/vision plan
                  A short- and long-term disability plan
                  A life insurance plan
                  401(k) plan including company match
                  Participation in company profit sharing program
                  Vacation to accrue at 3 weeks per year
                  Tuition Reimbursement per current Company policy

The Company reserves the right to alter or exchange employer provided benefits
as necessary.

As a valued member of the NOMOS senior management team, you will also receive an
enhanced severance agreement which will pay your base salary for twelve (12)
months in the event you are terminated for any reason other than for cause. This
severance will be paid over normal semimonthly payroll periods. This agreement
will also be honored in the event of a change of control of NOMOS Corporation
where another company acquires control of NOMOS and your job is eliminated or
your duties are diminished. If your job is not eliminated under a change of
control, then either the severance package will be transferred to the acquiring
company or it will be honored and paid by NOMOS Corporation.

If you agree with and accept the terms of this letter, please sign below and
return this letter to NOMOS Human Resources office. You will be required to sign
the NOMOS Confidentiality and Proprietary Rights Agreement, a copy of which is
enclosed for your perusal. Please sign and return it with this letter.

Best regards,

/s/   John W. Manzetti

John W. Manzetti
President and Chief Operating Officer

                                             Accepted by:

                                             /s/   Fred Marroni        7-11-01
                                             ---------------------------------
                                             Fred Marroni                 Date<PAGE>
                                                                   Exhibit 10.15

December 7, 2001

Mr. David J. Haffner
2568 Timberglen Drive
Wexford, PA 15090

Dear David,

On behalf of NOMOS Corporation, I am pleased to offer you a full-time position
as Vice President, Finance and Administration and Chief Financial Officer of
NOMOS Corporation, reporting to me. You will also be nominated at the next Board
meeting to have the duties and responsibilities of Secretary and Treasurer of
the Corporation.

As discussed, your compensation package will included:

     Base Salary         $160,000 annual compensation paid semi-monthly
     Incentive Bonus     $60,000 bonus opportunity as approved by the
                         Compensation Committee which will be set within
                         your first 30 days of employment.
     Stock Options       100,000 incentive stock options will be granted
                         on your start date and will vest equally over a
                         three-year period as per the terms of the NOMOS
                         Corporation Stock Option Plan
     Benefits:           A fully paid comprehensive medical/dental/vision plan
                         A short- and long-term disability plan
                         A life insurance plan
                         401(k) plan including company match
                         Participation in company profit sharing program
                         Vacation to accrue at 3 weeks per year
                         Tuition Reimbursement per current Company policy

The Company reserves the right to alter or exchange employer provided benefits
as necessary.

I would like you employment to be effective no later than January 2, 2002 and
would appreciate your acceptance of this offer immediately, but no later than
December 14, 2001, at which time the offer is no longer valid. If you agree with
and accept the terms of this letter, please sign below and return this letter to
NOMOS Human Resources. You will be required to sign the NOMOS Confidentiality
and Proprietary Rights Agreement, a copy of which is enclosed for you perusal.
Please sign and return it with this letter.

David, my entire team and I, and the NOMOS Board of Directors, are very pleased
to have you join us. We have a dynamic team, and a bright and growing future.
Together we will improve shareholder value as we continue to improve the lives
of cancer patients worldwide.

Best regards,

/s/  John W. Manzetti

John W. Manzetti
President & Chief Executive Officer

                                        Accepted by:

                                        /s/  David J. Haffner
                                        ----------------------------------------
                                        David J. Haffner                   Date<PAGE>
                                                                Exhibit 10.16(a)

                           SHARE REPURCHASE AGREEMENT

         This SHARE REPURCHASE AGREEMENT (this "AGREEMENT") is made as of
October 10, 2001 between JOHN A. FRIEDE, in his individual capacity
("STOCKHOLDER"), and NOMOS CORPORATION (the "COMPANY").

                                   BACKGROUND

         A. Stockholder is the holder of an option (the "OPTION") to purchase
917,500 shares (the "SHARES") of the Company's common stock, par value $.0001
per share (the "COMMON STOCK"), at a purchase price of $.50 per share, which
Option is currently one-third vested.

         B. Stockholder desires to exercise the Option in full, and the Company,
pursuant to resolutions of the Board of Directors (the "BOARD") dated of even
date herewith, has authorized such exercise; provided that, Stockholder enter
into this Agreement for the purpose of (a) subjecting the unvested Shares to
repurchase by the Company, and (b) limiting the transferability of such Shares,
in each case for a period corresponding to the vesting schedule under the
Option.

                                    AGREEMENT

         The parties hereto, intending to be legally bound, agree as follows:

         1. UNVESTED SHARES. As used in this Agreement, the term "UNVESTED
SHARES" shall mean, initially, all of the Shares; PROVIDED, that so long as no
Repurchase Event (as defined in Section 3 below) has occurred, then:

            (a) on December 15, 2001, one-third of the Shares shall
automatically vest and shall no longer be deemed to be "Unvested Shares"
hereunder;

            (b) on December 15, 2002, the remaining one-third of the Shares
shall automatically vest and shall no longer be deemed to be "Unvested Shares"
hereunder.

In addition, in the event that a Repurchase Event occurs, any Unvested Shares
that are not purchased by the Company in accordance with Section 3 of this
Agreement shall automatically vest and shall no longer be deemed "Unvested
Shares."

         2. RESTRICTIONS. Stockholder shall have all rights and privileges of a
stockholder of the Company as to the Unvested Shares, except that the following
restrictions shall apply:

            (a) No Unvested Shares may be sold, transferred, assigned, pledged
or otherwise encumbered or disposed of, any transfer made or purportedly made in
violation of this restriction shall be null and void, and the Company shall not
register or record such attempted transfer in its books and records;

<PAGE>

            (b) Each Unvested Share shall be subject to repurchase by the
Company in accordance with Section 3 of this Agreement;

            (c) As security for the faithful performance of this Agreement,
Stockholder, immediately upon receipt of any certificate representing Unvested
Shares, shall deliver such certificate, together with one or more stock powers
endorsed in blank by Stockholder to the Secretary of the Company to be held in
custody by the Secretary; and

            (d) Each certificate representing Unvested Shares shall bear
substantially the following legend, which shall be in addition to any other
legends required by law or contract:

            THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO
            REPURCHASE BY NOMOS CORPORATION AND ARE SUBJECT TO TRANSFER
            RESTRICTIONS, AS PROVIDED IN A SHARE REPURCHASE AGREEMENT AMONG
            NOMOS AND THE HOLDER HEREOF, A COPY OF WHICH IS ON FILE WITH THE
            SECRETARY OF NOMOS.

         Upon the vesting of any Shares previously constituting Unvested Shares,
the Secretary shall, at Stockholder's request, deliver to Stockholder a
certificate or certificates representing such vested Shares, which shall be free
of the legend described in Section 2(d) of this Agreement.

         3. UNVESTED SHARE PURCHASE RIGHTS. In the event of the voluntary or
involuntary departure, resignation, or termination of Stockholder from his
position as a member of the Board, for whatever reason except death (any such
event, a "REPURCHASE EVENT"), all Unvested Shares held by Stockholder shall be
subject to purchase by the Company pursuant to the following terms and
conditions of this Section 3.

            (a) The Company may, but shall not be obligated to, purchase some or
all of such Unvested Shares by giving written notice thereof to Stockholder
within thirty (30) days after the Repurchase Event, specifying (i) the number of
Unvested Shares the Company wishes to purchase, and (ii) the date on which the
Company desires to purchase such Unvested Shares, which date shall not be later
than (90) days following the date on which such notice is given.

            (b) The closing of the purchase of any Unvested Shares pursuant to
this Section 3 shall be held at the principle executive offices of the Company
on the date specified in the notice given pursuant to Section 3(a) of this
Agreement or on such other date as may be agreed to in writing by the parties.
At any such closing, (i) the Company shall deliver to Stockholder the Repurchase
Price (as defined in Section 3(c) of this Agreement) for such Unvested Shares
and (ii) the Secretary of the Company shall surrender for cancellation, pursuant
to the aforementioned stock power(s), the certificate(s) representing such
Unvested Shares.

            (c) The purchase price (the "REPURCHASE PRICE") to be paid by the
Company to Stockholder for the purchase of any Unvested Shares shall be $0.50
per share.

                                       2
<PAGE>

            4. TERMINATION. This Agreement shall automatically terminate upon
the earlier of (i) the date on which there are no longer any Unvested Shares,
(ii) the date on which all of the Unvested Shares are repurchased by the Company
in accordance with Section 3 hereof, or (iii) the death of Stockholder. Upon
termination of this Agreement, the terms and conditions contained herein shall
terminate and no longer be of any force or effect, except for any rights arising
from the prior breach of this Agreement to the extent such rights have not been
expressly waived by the non-breaching party.

            5. NOTICES. All notices, consents, requests, demands and other
communications required or permitted hereunder:

                  (i) shall be in writing;

                  (ii) shall be sent by messenger, certified or registered
United States mail, a reliable express delivery service or telecopier (with a
copy sent by one of the foregoing means), charges prepaid as applicable, to the
appropriate address(es) or number(s) set forth below; and

                  (iii) shall be deemed to have been given on the date of
receipt by the addressee (or, if the date of receipt is not a business day, on
the first business day after the date of receipt), as evidenced by (A) a receipt
executed by the addressee (or a responsible person in his or her office) or a
notice to the effect that such addressee refused to accept such communication,
if sent by messenger, United States mail or express delivery service, or (B) a
receipt generated by the sender's telecopier showing that such communication was
sent to the appropriate number on a specified date, if sent by telecopier.

         If to the Company, all such communications shall be sent to the
following address (or such other address as may be provided by the Company to
Stockholder):

                  NOMOS Corporation
                  2591 Wexford Bayne Road
                  Sewickley, PA 15143
                  Attn: Secretary

         If to Stockholder, to the address or number set forth in the records of
the Company for the purpose of giving notice to Stockholder.

         6. NO RIGHT TO BOARD MEMBERSHIP. STOCKHOLDER ACKNOWLEDGES AND AGREES
THAT THIS AGREEMENT DOES NOT AFFORD STOCKHOLDER ANY RIGHT TO CONTINUED
MEMBERSHIP ON THE BOARD.

         7. MISCELLANEOUS. This Agreement: (a) may be amended only by a writing
signed by each of the parties; (b) may not be assigned, pledged or otherwise
transferred, whether by operation of law or otherwise, without the prior consent
of the other party; (c) may be executed in several counterparts, each of which
is deemed an original but all of which constitute one and the same instrument;
(d) contains the entire agreement of the parties with respect to the

                                       3
<PAGE>

transactions contemplated hereby and supersedes all prior written and oral
agreements, and all contemporaneous oral agreements, relating to such
transactions; (e) is governed by, and will be construed and enforced in
accordance with, the laws of the State of Delaware without giving effect to any
conflict of laws rules; and (f) is binding upon, and will inure to the benefit
of, the parties and their respective heirs, successors and permitted assigns.
The waiver by a party of any breach or violation of any provision of this
Agreement will not operate as, or be construed to be, a waiver of any subsequent
breach or violation hereof.

                                       4

<PAGE>

         IN WITNESS WHEREOF, the parties hereto have executed this Share
Repurchase Agreement as of the date first written above.

                                        /s/ John A. Friede
                                        ----------------------------------------
                                        John A. Friede
                                        in his individual capacity

                                        NOMOS CORPORATION

                                        By: /s/ John W. Manzetti
                                           -------------------------------------

                                        Name: John W. Manzetti
                                             -----------------------------------

                                        Title: President and Chief
                                               Executive Officer
                                              ----------------------------------

                                       5

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