Document:

EMPLOYMENT AGREEMENT

    This  Employment Agreement  (hereinafter  referred to as the "Agreement") is
entered into this 1st day of April,  1998, and effective as of April 1, 1998, by
and between  Nu-Tec.,  L.T.D.  (hereinafter  referred to as the  "Employer'),  a
Colorado  corporation  with its  executive  offices  located at 1880  Industrial
Circle, Suite #B-3, Longmont,  Colorado 80501, and Donald A. Ludwig (hereinafter
referred to as the "Employee").

                                   WITNESSETH:

     WHEREAS:

     1. The Employer is engaged in the business of developing, manufacturing and
distributing radiochemical and
radiopharmaceutical products.

     2. The Employee has certain expertise in the above-described business.

     3. The Employer  desires to employ the Employee and the Employee desires to
be employed by the Employer upon the terms and conditions hereinafter set forth.

     NOW,  THEREFORE,  in  consideration  of the mutual  promises and agreements
hereinafter  set  forth,  the  receipt  and  sufficiency  of  which  are  hereby
acknowledged, the parties hereto agree as follows:

     1. Employment.  The Employer hereby employs, engages and hires the Employee
as the Executive Vice President of the Employer and the Employee  hereby accepts
and agrees to such employment,  hiring and engagement and to the orders,  advice
and direction of the Employer. In addition,  the Employee shall have and perform
such other duties as are  customarily  performed by one holding such position in
other  businesses or enterprises that are the same as or similar to that engaged
in by the  Employer,  and shall  have and  perform  such  unrelated  duties  and
services as may be  assigned to him from time to time by the Board of  Directors
and/or  the  President  of the  Employer.  The  Employee  agrees to abide by the
Company  policies and procedures  established from time to time by the Employer.
The exact nature of the duties of the Employee  shall be more fully outlined and
defined in a formal job  description  between  the  Employer  and the  Employee,
copies of which,  as amended  from time to time,  shall be  attached  hereto and
incorporated  herein by this  reference.  The  Employee  shall  accept  from the
Employer, as full compensation for his services,  including, without limitation,
any services rendered by him as an officer or director of the Employer or of any
parent, subsidiary or affiliate of the Employer, the compensation in the form of
salary and shares of common stock, no par value per share (hereinafter  referred
to as the" Common Stock"), of the Employer as provided in Section 4 below.

     2. Best Efforts of Employee.  The Employee agrees that he will at all times
faithfully, industriously and to the best of his ability, experience and talents
perform to the  reasonable  satisfaction  of the Employer all of the duties that
may be required of and from him pursuant to the express arid  implicit  terms of
this Agreement.
<PAGE>

     Such  duties  shall be  rendered  at 1880  Industrial  Circle,  Suite #8-3,
Longmont,  Colorado 80501,  and at such place or places and during such hours as
the Employer shall in good faith require or as the interest,  needs, business or
opportunity of the Employer shall require.

     3. Term of Employment. The term of this Agreement shall be a period of five
(5) years, commencing April 1, 1998, and terminating December 31, 2003, subject,
however, to prior termination as hereinafter provided.

     4. Compensation of Employee. The Company shall pay or furnish the Employee,
and the Employee  shall accept from the Company,  as full  compensation  for the
Employee's services, including, without limitation, any services rendered by him
as an officer or  director  of the  Employer  or of any  parent,  subsidiary  or
affiliate of the Employer, the following compensation:

          a. A gross salary of $100,000 per annum, payable in equal monthly
installments  once or twice per month on the first day of each' month during the
term of this Agreement.  Employee stipulates that during the first two (2) years
of this  Agreement,  that Employer may not be able to pay the full amount of the
agreed  salary  and  Employee  is  willing  to  accept a lesser  amount  without
expectation  of being paid the  balance of the  salary  during any future  year.
Notwithstanding the foregoing,  Employee and Employer mutually  acknowledge that
any  amounts  of  compensation  waived by  Employee  under in  establishing  any
additional  incentive  compensation  paid to Employee under paragraph 4.b below.
New additions or changes to an original license  application not in the original
application,  further incentive compensation in the minimum amount not less than
$40,000 per license application will apply.

          b. In the event that Employer  receives major funding from  investment
sources,  the Board of Directors may, in its sol~  discretion,  determine to pay
additional  incentive  compensation  to Employee for the performance of services
not   customarily   performed   by   the   Executive   Vice   President   of   a
radiopharmaceutical  company,  in such amounts and forms as shall be established
by it. The nature, extent,  complexity and other factors in connection with such
services  shall be presented  to and  evaluated by the Board of Directors of the
Employer at a Special Meeting of the Board of Directors called for that purpose.

     5. Termination.

          a. This  Agreement  may be  terminated by the Employee upon sixty (60)
days' prior written  notice to the Employer.  If the Employee shall so terminate
this Agreement,  the Employee shall be entitled to be paid only through the date
of such termination.

          b. (1) The Employer, by a majority vote of the Board of Directors, may
terminate this Agreement at any time for cause, as defined below, without notice
to the Employee and with pay only through the date of such termination.
<PAGE>

               (2) Sufficient  cause for  termination by the Employer shall be a
determination  made in good faith and based  upon  reasonable  grounds  that the
Employee:  (a) has failed to properly perform his material duties hereunder,  or
has been substantially  absent from employment for material amounts of time; (b)
has engaged in habitual  drunkenness  or abusive  drugs  rendering  the Employee
unable to carry our his duties in a responsible manner; (c) has committed an act
with the intent to defraud or hinder the Employer;  or (d) has been negligent in
the performance of the duties owed by the Employee to the Employer,

               (3)  As soon as may be practicable  after the  termination of the
Employee by the Employer for cause, the Board of Directors of the Employer shall
make an Investigation  of, and allow the Employee an opportunity to discuss with
the Board of Directors, the relevant facts with respect thereto. If the Board of
Directors of the Employer shall  determine that the Employee has been terminated
without  cause,  the Employee  shall be reinstated in the position which he held
prior to the termination and shall receive any  compensation  accrued or payable
during the period of his termination.  In such event, any accrued benefits shall
be payable to the Employee as if the Employee had not been terminated.

               (4) Any conduct of the Employee which shall  constitute cause for
termination  under  the  terms of  subsection  b. (2) of this  Section 6 and any
breach or evasion of any of the terms of this  Agreement  by either party hereto
will result in immediate  and  irreparable  injury to the injured party and will
authorize  recourse to injunction and/or specific  performance as well as to all
other legal or equitable  remedies to which such  injured  party may be entitled
hereunder.

          c. If the Employee shall die during the term of this  Agreement,  this
Agreement and the Employee's  employment  hereunder shall terminate  immediately
upon the Employee's  death,  provided that the Employee shall be entitled to his
salary hereunder to the last day of the sixth month following the month in which
such death occurs.

          d.   (1)  Notwithstanding  anything in this Agreement to the contrary,
                    the Employer is hereby  given the option to  terminate  this
                    Agreement  and the  Employee's  employment  hereunder in the
                    event  that the  Employee,  during  the term  hereof,  shall
                    become  permanently  disabled as defined in subsection d.(2)
                    of this Section 6 below. Such option may be exercised by the
                    Employer at any time after the Employee becomes  permanently
                    disabled  by giving  written  notice of  termination  to the
                    Employee. This Agreement and the Employee's employment shall
                    terminate  one hundred  eighty (180) days after such notice,
                    provided  that  the  Employee   shall  be  entitled  to  the
                    compensation  as  provided  in Section 4. hereof to the last
                    day of the month in which such termination occurs.

               (2)  For purposes of this Agreement, the Employee shall be deemed
                    to have  become  permanently  disabled  if,  because  of ill
                    health,  physical or mental  disability  or for other causes
                    beyond his  control,  he shall have been unable or unwilling
                    or shall duties  hereunder on seventy-five per cent (75%) of
                    the days  during a period  of four (4)  consecutive  months,
                    irrespective of whether or not such days are consecutive.
<PAGE>

     6. Extent of Service:  Self-Dealing.  The  Employee  shall devote his full,
normal  working time,  attention and energy to the business of the Employer and,
as  assigned  by the Board of  Directors  of the  Employer,  to the  business of
corporations affiliated with the Employer, and shall not during the term of this
Agreement be engaged in any other  business  activity  which  conflicts with the
Employee's  obligations  under  this  Agreement.  The  foregoing  shall  not  be
construed as preventing  the Employee from making  investments  in businesses or
enterprises provided such investments do not require any services on the part of
the  Employee in the  management,  operation  or affairs of such  businesses  or
enterprises.

     The Employee shall  cooperate  with,  assist and furnish  information  upon
request to the  President  or the Board of  Directors  of the Employer or of the
directors or  affiliates  of the Employer and the auditors and legal counsel for
the Employer or its  affiliates.  The provisions of this Section 6 shall survive
termination of this Agreement with respect to matters  arising during the period
of employment of the Employee by the Employer.

     7.  Disclosures of Information.  The Employee  recognizes and  acknowledges
that he has and will have  access to  certain  confidential  information  of the
Employer  and  its  affiliates,  such  as  data  accumulation  and  analysis  of
technology,    specifications,    intellectual   property,    applications   for
radiochemical and radiopharmaceutical  products,  lists of clients or customers,
know-how  and other  proprietary  information,  that are  valuable,  special and
unique  assets and property of the Employer  and such  affiliates.  The Employee
will not, after the term of his employment,  disclose, without the prior written
consent or authorization  of the Employer,  any of such information to any firm,
person,  corporation,  association,  enterprise or other entity.  In the event a
third  party  seeks to compel  disclosure  of  confidential  information  by the
Employee by judicial or  administrative  process,  the Employee  shall  promptly
notify the Employer of such occurrence and furnish to the Employer a copy of the
demand,  summons,  subpoena or other process  served upon the Employee to compel
such  disclosure,  and will  permit the  Employer to assume,  at the  Employer's
expense but with the Employee's cooperation, defense of the disclosure demand.

     Upon termination of the Employee's employment by the Employer, the Employee
shall neither take or retain any proprietary  papers,  customer lists,  manuals,
files or other  documents or copies thereof  belonging to the Employer or any of
its affiliates.

     The  provisions  of this Section 8, shall survive the  termination  of this
Agreement.  In the event of a breach or threatened breach by the Employee of the
provisions  of this Section 8, the Employer  shall be entitled to an  injunction
restraining the Employee from disclosing, in whole or in part, such confidential
information.  Nothing herein shall be construed as prohibiting the Employer from
pursuing  any  other  remedies  available  to the  Employer  for such  breach or
threatened breach, including the recovery of damages from the Employees.

     8. Vacation. The Employees shall be entitled to a vacation of six (6) weeks
per year, plus customary local holidays,  during the term of this Agreement. The
Employee shall be entitled to receive all compensation payable hereunder in full
during the period of any vacation.
<PAGE>

     9. Other  Benefits.  The Employee  shall be entitled to all other  benefits
contained in the approved  Company  benefit  plan(s)  offered to all  employees,
subject to the  provisions of such plan(s).  This plan includes  holidays,  sick
leave and other benefits.

     10.  Notices.  Any notice  required  or  permitted  to be given  under this
Agreement  shall be sufficient if in writing and delivered or sent by registered
or certified mail to his last known address, in the case of the Employee,  or to
the principal executives offices of the Company, in the case of the Employer.

     11.  Waiver  of  Breach.  Any  waiver  by the  Employer  of a breach of any
provision of this Agreement by the Employee shall not operate or be construed as
a waiver of any subsequent breach by the Employee.

     12.  Assignment.  The rights and  obligations  of the  Employer  under this
Agreement shall inure to the benefit of and shall be binding upon the successors
and assigns of the Employer.

     13.  Applicable  Law. It is the  intention of the parties  hereto that this
Agreement and the  performance  hereunder and all suits and special  proceedings
here under be construed in accordance with and pursuant to the laws of the State
of Colorado and that in any action,  special proceeding or other proceeding that
may be  brought  arising  out  of,  in  connection  with  or by  reason  of this
Agreement,  the laws of the  State of  Colorado  shall be  applicable  and shall
govern to the  exclusion  of the law of any other forum,  without  regard to the
jurisdiction in which any action or special proceeding may be instituted.

     14.  Severability.  All  agreements  and  covenants  contained  herein  are
severable,  and in the event any of them,  with the exception of those contained
iii Sections I and 4 hereof, shall be held to be invalid by any competent court,
this Agreement  shall be interpreted as if such invalid  agreements or covenants
were not contained herein.

     15. Entire  Agreement.  This Agreement  constitutes and embodies the entire
understanding and agreement of the parties and supersedes and replaces all prior
understandings,  agreements and negotiations between the parties,  provided that
nothing herein shall be deemed to restrict or limit the common law duties of the
Employee to the Employer.

     16. Waiver and Modification.  Any waiver, alteration or modification of any
of the provisions of this  Agreement  shall be valid only if made in writing and
signed by the parties  hereto.  Each party hereto,  from time to time, may waive
any of his or its rights  hereunder  without  effecting a waiver with respect to
any subsequent occurrences or transactions hereof

     17. Captions and Paragraph  Headings.  Captions and paragraph headings used
herein are for convenience  only, are not a part hereof and shall not be used in
construing this Agreement.

<PAGE>

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

                                             EMPLOYEE

                                             /s/ Donald A. Ludwig
                                             -----------------------
                                             Donald A Ludwig

                                             EMPLOYER:

                                             NU-TEC., L.T.D.

Attest: /s/ Janet Davis
-------------------------                    By:  /s/ Malcolm H. Benedict
Janet Davis, Secretary                            -----------------------
                                                  Malcolm H. BenedictDVI Financial Services Inc.

(DVI/NYSE)

1400 PRESTON ROAD, SUITE 370

PLANO, TEXAS 75093

TELEPHONE:   (972) 769-0012
FACSIMILE:   (972) 769-8063

September 30, 1999

Mr. Malcolm H. Benedict
President - C.E.O.
Nu-Tec, L.T.D.

2595 Canyon Blvd. Suite 160
Boulder, CO 80302

Dear Malcolm:

It is my pleasure to outline the following proposal for your review. It is based
on the  following  conditions to be met by Nu-Tec and it is the intention of DVI
Financial  Services,  Inc. to proceed with final approval based on the following
criteria:

         1.       Nu-Tec,  L.T.D.  to  have  a net  worth  equal  to,  at  least
                  twenty-five percent (25%) of transaction amount.

         2.       Nu-Tec,  L.T.D.  to have  sufficient  working capital to cover
                  operations and lease payment for 12 to 18 months for start up.

         3.       Commitment  fee of 1% of transaction to be deposited with DVI.
                  This is referenced in the Commitment  Payment  section of this
                  proposal.

         4.       Completion  of business plan to include  information  on which
                  assumptions  are based in the  proforma,  location of facility
                  with lease or purchase cost and updated  management  team with
                  background and resumes.

         SECURED PARTY: DVI Financial Services, its affiliates or assigns.

         LESSEE: Nu-Tec, L.T.D.

         EQUIPMENT: Cyclone 30 Cyclotron System with all necessary equipment.

         EQUIPMENT COST: $10,000,000.00

         LEASE TERM: 60 months (5 years)

         PAYMENTS:  Equal  consecutive  monthly  payments  each  in  advance  at
         $217,424.23 each

         ADVANCED
         PAYMENTS: First monthly payment.

         LEASE COMMENCEMENT:

                                     The  above  quotations  are  based  on a 33
                                     month  average  of U.S.  Treasury  rates as
                                     published by the Federal  Reserve  which at
                                     this time are 5.65%.  For each  increase or
                                     decrease  of .25% in those  Treasury  rates
                                     the payments  will be adjusted to reflect a
                                     corresponding   change   until   the  lease
                                     documents  are  accepted by Nu-Tec,  L.T.D.
                                     Upon  acceptance  by  Nu-Tec,  L.T.D.,  the
                                     Payments would be fixed for the duration of
                                     the  lease  term  and  based  on  the  then
                                     prevailing treasury rates.
<PAGE>

LESSOR AGREEMENT
AT MATURITY OF
LEASE TERM:       At the  completion  of tile lease term,  provided all payments
                  have  been  made,  and the  lease is not in  default,  Nu-Tec,
                  L.T.D. may purchase  equipment for the then purchase option of
                  $1.00.

INTERIM PAYMENT:  The Lessee shall pay daily  payments,  equivalent to 1\3Oth of
                  the monthly payments, for the period from and inclusive of the
                  date of Lessee's  execution of the  Certificate  of Acceptance
                  the day preceding the Lease commencement Date.

INTEREST ON
PROGRESS
PAYMENTS:         Interest on outstanding  progress payments will be at the rate
                  of Prime plus 375 basis points (3.75%).

TAXES:            The Lessee shall pay all fees,  assessments,  sales,  property
                  and other taxes imposed.

MAINTENANCE:      Lessee will keep and maintain the equipment in good  operating
                  order, repair and condition.

INSURANCE:        Lessee will provide all inclusive insurance.

APPROVAL OF
TRANSACTION:      The proposed  lease is  subject to the approval of the Secured
                  Party's  Executive  Committee  and no  deleterious  change  in
                  Lessee's  financial  condition prior to the Equipment Delivery
                  and Acceptance Date.

REPRESENTATIONS
AND FINANCIAL
STATEMENTS:       Lessee has furnish Secured Party with financial statements for
                  the  last  three  (3)  fiscal  years  and its  latest  interim
                  statements, plus other pertinent information,  along with bank
                  and trade references, pro forma, etc.

LEGAL, SEARCH AND
FILING FEES:      Lessee will reimburse  Secured Party for expenses incurred for
                  searches and filing fees.  Secured Party anticipates using its
                  standard  documentation  and if the transaction is approved by
                  Secured  Party,  Lessee  agrees  to a $250.00  non  refundable
                  documentation   fee  to  cover   administrative   expenses  of
                  processing this  transaction.  Although the Secured Party does
                  not anticipate any additional  expenses,  if this  transaction
                  necessitates   extensive  use  of  Secured  Party's  in  house
                  counsel,  the obtaining of  appraisals or other  extraordinary
                  expenses, such costs shall be borne by Lessee.

COMMITMENT
PAYMENT:          Upon acceptance of this proposal,  Lessee shall pay to Secured
                  Party  an  advance  payment  equal  to $ (1 %) of  tile  total
                  anticipated equipment cost ($100,000.00). This advance payment
                  will be credited to the Lessee's advance payments on a prorata
                  basis as funds are taken down.
<PAGE>

                  If this lease  proposal is not approved by the Secured  Party'
                  as proposed or in an acceptable  manner to Lessee as indicated
                  on the  original  or  signed  amended  proposal,  the  advance
                  payments win be promptly and fully refunded to Lessee.

                  If this Lease is approved,  but takedown does not occur by the
                  Equipment Delivery and Acceptance Date through no fault of the
                  Secured Party,  this Commitment fee will be considered  earned
                  by Secured Party.

EXPIRATION OF
PROPOSAL:         This  proposal  expires  November 30, 1999, if not accepted by
                  Lessee.

     I sincerely  appreciate  the  opportunity  to submit this proposal for your
review and approval.

Sincerely,

/s/ Joe Rush
-------------------
    Joe Rush
    Regional  Manager

    ACCEPTED AND APPROVED
    Nu-Tec, L.T.D
    by: /s/ Malcolm H. Benedict
        -----------------------
    title: President & C.E.O.
           --------------------
    date: 9/30/99
          ---------------------

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