Document:

EXHIBIT 10.67

THIS WARRANT AND THE SHARES OF STOCK OF POSITRON  CORPORATION  TO BE ISSUED UPON
ANY EXERCISE OF THIS WARRANT HAVE NOT BEEN AND WILL NOT BE  REGISTERED  WITH THE
SECURITIES AND EXCHANGE COMMISSION UNDER THE SECURITIES ACT OF 1933, AS AMENDED,
OR UNDER  ANY  STATE  SECURITIES  LAW AND ANY  SALE,  TRANSFER,  PLEDGE OR OTHER
DISPOSITION  THEREOF  MAY BE MADE ONLY (i) IN A  REGISTRATION  UNDER SAID ACT OR
(ii) IF AN  EXEMPTION  FROM  REGISTRATION  UNDER SAID ACT AND  APPLICABLE  STATE
SECURITIES  LAWS IS AVAILABLE AND THE COMPANY HAS RECEIVED AN OPINION OF COUNSEL
TO THAT EFFECT REASONABLY SATISFACTORY TO IT.

                              POSITRON CORPORATION

                          COMMON STOCK PURCHASE WARRANT
                   TO PURCHASE 160,000 SHARES OF COMMON STOCK
                             OF POSITRON CORPORATION

                     This Warrant Expires September 1, 2004

WARRANT NO. 99-12                                                 160,000 SHARES

         THIS CERTIFIES  that,  subject to the terms and  conditions  herein set
forth in this warrant,  OKAMURA  ASSOCIATES,  INC. (the "Holder") is entitled to
purchase from Positron Corporation, a Texas corporation ("Company"), at any time
or from time to time during the  Exercise  Period  (defined in Section 12 below)
and  subject to the  provisions  regarding  Exercise of Warrant (as set forth in
Section 6 below) the number of fully  paid and  non-assessable  shares of common
stock of the Company (the  "Shares") as provided  herein upon  surrender of this
Warrant at the  principal  office of the  Company,  and, at the  election of the
Holder,  upon  payment  of the  purchase  price  at  said  office  in cash or by
cashier's check or by the wire transfer of funds in a dollar amount equal to the
purchase price of the Shares for which the consideration is being given.

         This  Warrant  shall be  exercisable  for that  number of Shares as set
forth above, in minimum units of 10,000 shares.

         1. PURCHASE PRICE. Subject to adjustment as hereinafter  provided,  the
purchase  price of one  share of  Common  Stock  (or such  securities  as may be
substituted for one share of Common Stock pursuant to the provisions hereinafter
set forth) (the "Warrant Price") shall be Thirty Cents ($0.30).

         2.  ADJUSTMENT  OF WARRANT  PRICE AND NUMBER OF SHARES.  The number and
kind of  securities  issuable upon the exercise of this Warrant shall be subject
to adjustment from time to time upon the happening of certain events as follows:

             a.  Adjustment  for Dividends in Stock.  If at any time on or after
the date  hereof,  the holders of the Common Stock of the Company (or any shares
of stock or other

<PAGE>

securities at the time  receivable upon the exercise of this Warrant) shall have
received,  or, on or after  the  record  date  fixed  for the  determination  of
eligible  stockholders,  shall have become entitled to receive,  without payment
therefor,  other or  additional  stock of the Company by way of dividend  (other
than as provided for in Section 2(b)  below),  then and in each such case,  upon
the  exercise of this  Warrant,  the Holder  shall be  entitled  to receive,  in
addition to the number of shares of Common Stock receivable, and without payment
of any additional consideration therefor, the amount of such other or additional
stock of the Company which the Holder would receive on the date of such exercise
had it been the holder of record of such Common Stock on the date hereof and had
thereafter,  during the period from the date hereof to and including the date of
such exercise, retained such shares and/or all other additional stock receivable
by it as aforesaid during such period and given effect to all adjustments called
for during such period by this  Section 2.

             b.  Adjustment for Changes in Common Stock. In the event of changes
in the  outstanding  Common  Stock  of the  Company  by  reason  of  split--ups,
recapitalizations,  reclassifications,  mergers, consolidations, combinations or
exchanges of shares, separations,  reorganizations,  liquidations,  or the like,
the number and class of shares  available under the Warrant in the aggregate and
the Warrant Price shall be correspondingly adjusted by the Board of Directors of
the Company.  The  adjustment  shall be such as will give the Holder on exercise
for the same aggregate Warrant Price the total number, class, and kind of shares
as the Holder would have owned had the Warrant been exercised prior to the event
and had the Holder continued to hold such shares until after the event requiring
adjustment.

         3. NO FRACTIONAL  SHARES.  No fractional shares of Common Stock will be
issued in connection with any  subscription  under this Warrant.  In lieu of any
fractional shares which would otherwise be issuable,  the Company shall pay cash
equal to the product of such fraction multiplied by the fair market value of one
share of Common Stock on the date of exercise as determined in good faith by the
Company's Board of Directors.

         4. NO STOCKHOLDER  RIGHTS. This Warrant shall not entitle its holder to
any of the rights of a stockholder of the Company prior to its exercise.

         5. RESERVATION OF STOCK.  The Company  covenants that during the period
this Warrant is  exercisable,  the Company will reserve from its  authorized and
unissued Common Stock a sufficient  number of shares to provide for the issuance
of Common Stock upon the exercise of this Warrant.  The Company  agrees that its
issuance of this Warrant shall constitute full authority to its officers who are
charged with the duty of executing  stock  certificates to execute and issue the
necessary  certificates  for shares of Common  Stock upon the  exercise  of this
Warrant.

         6.  EXERCISE OF WARRANT.  Subject to the terms and  conditions  hereof,
this Warrant may be exercised by the holder hereof then  registered on the books
of the Company at any time during the exercise Period as set forth in Section 12
hereof. Subject to the foregoing, this Warrant may be exercised by the Holder or
its  registered  assigns,  in whole or in part and in  minimum  units of  10,000
shares, by the surrender of this Warrant at the principal office of the Company,
together with the attached form of  subscription  duly executed,  accompanied by
payment in full of the amount of the Warrant Price in the form described in this
Warrant. Upon

                                      -2-
<PAGE>

partial exercise of this Warrant, a new warrant or warrants  containing the same
date and  provisions  as this  Warrant  shall be  issued by the  Company  to the
registered holder for the number of shares of Common Stock with respect to which
this Warrant  shall not have been  exercised.  A Warrant shall be deemed to have
been  exercised  immediately  prior to the close of  business on the date of its
surrender for exercise as provided above, and the person entitled to receive the
shares of Common  Stock  issuable  upon such  exercise  shall be treated for all
purposes  as the holder of such  shares of record as of the close of business on
such date. As promptly as  practicable  on or after such date, the Company shall
issue and deliver to the person or persons  entitled  to receive  the shares,  a
certificate  or  certificates  for the  number of full  shares  of Common  Stock
issuable  upon such  exercise,  together  with cash in lieu of any fraction of a
share as provided  above.

         7. CERTIFICATE OF ADJUSTMENT. Whenever the Warrant Price is adjusted as
provided in Section 2, the Company shall  promptly  deliver to the record holder
of this Warrant a  certificate  of an officer of the Company  setting  forth the
relevant  Warrant  Price or number of shares after such  adjustment  and setting
forth a brief statement of the facts requiring such adjustment.

         8. COMPLIANCE  WITH  SECURITIES ACT. The Holder,  by acceptance of this
Warrant,  agrees that this  Warrant and the shares of Common  Stock to be issued
upon its exercise (or shares of any security into which such Common Stock may be
converted)  (the "Shares") are being acquired for investment and that the Holder
will not offer,  sell,  or  otherwise  dispose of this Warrant and any shares of
Common  Stock to be issued upon its  exercise  (or shares of any  security  into
which such Common Stock may be converted) except under  circumstances which will
not  result in a  violation  of the  Securities  Act of 1933,  as  amended  (the
"Securities  Act").  Upon exercise of this Warrant,  the holder hereof shall, if
requested  by the  Company,  confirm  in  writing  its  investment  purpose  and
acceptance of the restrictions on transfer of the Shares.

         9. SUBDIVISION OF WARRANT. At the request of the holder of this Warrant
in  connection  with a transfer or exercise of a portion of the Warrant and upon
surrender of this  Warrant for such  purpose to the Company,  the Company at its
expense  (except for any transfer tax payable)  will issue in exchange  therefor
warrants  of like nature and date  representing  in the  aggregate  the right to
purchase  such number of shares of such Common Stock as shall be  designated  by
such holder at the time of such surrender; provided, however, that the Company's
obligations to subdivide  securities  under this Section shall be subject to and
conditioned  upon the compliance of any such  subdivision  with applicable state
securities laws and with the Securities Act.

         10. LOSS, THEFT, DESTRUCTION, OR MUTILATION OF WARRANT. Upon receipt by
the  Company  of  evidence  reasonably  satisfactory  to it of the loss,  theft,
destruction,  or mutilation of this Warrant,  and in the case of loss, theft, or
destruction,  of  indemnity  or  security  reasonably  satisfactory  to  it  and
reimbursement to the Company of all reasonable  expenses  incidental thereto, in
the case of mutilation,  and upon surrender and cancellation of this Warrant the
Company  will make and  deliver a new Warrant of like tenor and dates as of such
cancellation, in lieu of this Warrant.

         11.  MISCELLANEOUS.  This Warrant  shall be governed by the laws of the
State of Texas. The headings in this Warrant are for purposes of convenience and
reference only, and shall not

                                      -3-
<PAGE>

be deemed to  constitute  a part of this  Warrant.  Neither this Warrant nor any
term included may be changed, waived,  discharged, or terminated orally but only
by an  instrument in writing  signed by the Company and the Holder.  All notices
and other  communications from the Company to the Holder shall be by telecopy or
expedited  courier service to the address furnished to the Company in writing by
the last  holder of this  Warrant  who shall  have  furnished  an address to the
Company in writing.  This Warrant has been issued pursuant to a Warrant Purchase
Agreement  dated as of June 15,  1999,  the  terms of which,  including  certain
repurchase  provisions,  are  incorporated  herein by reference.  A copy of such
Warrant Purchase  Agreement may be inspected at the office of the Company during
normal business hours.

         12.  EXERCISE  PERIOD.  The  Exercise  Period  shall  mean  the  period
commencing on the date hereof and ending on August 31, 2004.

         ISSUED this first day of September, 1999.

                                             POSITRON CORPORATION

                                             By:  /s/ Gary H. Brooks
                                                -----------------------------
                                                  Gary H. Brooks, President

ATTEST:

-----------------------------

                                      -4-
<PAGE>

                               FORM OF ASSIGNMENT
                              POSITRON CORPORATION

         FOR VALUE  RECEIVED the  undersigned  registered  owner of this Warrant
hereby sells,  assigns,  and transfers  unto the Assignee named below all of the
rights of the undersigned  under the within Warrant,  with respect to the number
of shares of Common Stock set forth below:

<TABLE>
<CAPTION>
Name of Assignee                                        Address                           Number of Shares
<S>                                                     <C>                               <C>

</TABLE>

The undersigned does hereby irrevocably  constitute and appoint  _______________
_______________________  Attorney to make such transfer on the books of POSITRON
CORPORATION  maintained for the purpose,  with full power of substitution in the
premises.

Dated:______________________

                                                Name of Warrant Holder

                                                Signature:
                                                          ---------------------
Witness:____________________

<PAGE>

                                SUBSCRIPTION FORM
                              POSITRON CORPORATION

                 (To be executed only upon exercise of Warrant)

         The undersigned  registered owner of this Warrant irrevocably exercises
this  Warrant  for and  purchases  ________________  of the  number of shares of
Common Stock of POSITRON CORPORATION purchasable with this Warrant, and herewith
makes  payment  therefor,  all at the  price  and on the  terms  and  conditions
specified in this Warrant.

Dated:_____________________

                  -------------------------------------------------------------
                  (Signature of Registered Owner)

                  -------------------------------------------------------------
                  (Street Address)

                  -------------------------------------------------------------
                  (City)                       (State)                (Zip Code)EXHIBIT 10.68

THIS WARRANT AND THE SHARES OF STOCK OF POSITRON  CORPORATION  TO BE ISSUED UPON
ANY EXERCISE OF THIS WARRANT HAVE NOT BEEN AND WILL NOT BE  REGISTERED  WITH THE
SECURITIES AND EXCHANGE COMMISSION UNDER THE SECURITIES ACT OF 1933, AS AMENDED,
OR UNDER  ANY  STATE  SECURITIES  LAW AND ANY  SALE,  TRANSFER,  PLEDGE OR OTHER
DISPOSITION  THEREOF  MAY BE MADE ONLY (i) IN A  REGISTRATION  UNDER SAID ACT OR
(ii) IF AN  EXEMPTION  FROM  REGISTRATION  UNDER SAID ACT AND  APPLICABLE  STATE
SECURITIES  LAWS IS AVAILABLE AND THE COMPANY HAS RECEIVED AN OPINION OF COUNSEL
TO THAT EFFECT REASONABLY SATISFACTORY TO IT.

                              POSITRON CORPORATION

                          COMMON STOCK PURCHASE WARRANT
                  TO PURCHASE 3,000,000 SHARES OF COMMON STOCK
                             OF POSITRON CORPORATION

                      This Warrant Expires August 18, 2004

WARRANT NO. 99-14                                               3,000,000 SHARES

      THIS CERTIFIES that,  subject to the terms and conditions herein set forth
in this warrant,  MORRIS HOLDINGS LIMITED (the "Holder") is entitled to purchase
from Positron Corporation, a Texas corporation ("Company"),  at any time or from
time to time  during  the  Exercise  Period  (defined  in  Section 12 below) and
subject to the provisions regarding Exercise of Warrant (as set forth in Section
6 below) the number of fully paid and  non-assessable  shares of common stock of
the Company (the "Shares") as provided  herein upon surrender of this Warrant at
the principal  office of the Company,  and, at the election of the Holder,  upon
payment of the purchase price at said office in cash or by cashier's check or by
the wire transfer of funds in a dollar amount equal to the purchase price of the
Shares for which the consideration is being given.

      This Warrant shall be  exercisable  for that number of Shares as set forth
above,  in minimum  units of  100,000  shares.

      1.    PURCHASE PRICE. Subject to adjustment as hereinafter  provided,  the
purchase  price of one  share of  Common  Stock  (or such  securities  as may be
substituted for one share of Common Stock pursuant to the provisions hereinafter
set forth) (the "Warrant Price") shall be Five Cents ($0.30).

      2.    ADJUSTMENT  OF WARRANT  PRICE AND  NUMBER OF SHARES.  The number and
kind of  securities  issuable upon the exercise of this Warrant shall be subject
to adjustment from time to time upon the happening of certain events as follows:

<PAGE>

            a.    ADJUSTMENT FOR DIVIDENDS IN STOCK.  If at any time on or after
the date  hereof,  the holders of the Common Stock of the Company (or any shares
of stock or other  securities at the time  receivable  upon the exercise of this
Warrant)  shall have  received,  or, on or after the  record  date fixed for the
determination of eligible  stockholders,  shall have become entitled to receive,
without  payment  therefor,  other or additional  stock of the Company by way of
dividend  (other than as provided for in Section  2(b) below),  then and in each
such case,  upon the exercise of this  Warrant,  the Holder shall be entitled to
receive,  in addition to the number of shares of Common  Stock  receivable,  and
without  payment of any additional  consideration  therefor,  the amount of such
other or  additional  stock of the Company which the Holder would receive on the
date of such  exercise  had it been the holder of record of such Common Stock on
the date  hereof and had  thereafter,  during the period from the date hereof to
and including the date of such  exercise,  retained such shares and/or all other
additional  stock  receivable  by it as  aforesaid  during such period and given
effect to all adjustments called for during such period by this Section 2.

            b.    Adjustment  for  Changes  in  Common  Stock.  In the  event of
changes in the outstanding  Common Stock of the Company by reason of split--ups,
recapitalizations,  reclassifications,  mergers, consolidations, combinations or
exchanges of shares, separations,  reorganizations,  liquidations,  or the like,
the number and class of shares  available under the Warrant in the aggregate and
the Warrant Price shall be correspondingly adjusted by the Board of Directors of
the Company.  The  adjustment  shall be such as will give the Holder on exercise
for the same aggregate Warrant Price the total number, class, and kind of shares
as the Holder would have owned had the Warrant been exercised prior to the event
and had the Holder continued to hold such shares until after the event requiring
adjustment.

      3.    NO FRACTIONAL  SHARES.  No fractional shares of Common Stock will be
issued in connection with any  subscription  under this Warrant.  In lieu of any
fractional shares which would otherwise be issuable,  the Company shall pay cash
equal to the product of such fraction multiplied by the fair market value of one
share of Common Stock on the date of exercise as determined in good faith by the
Company's Board of Directors.

      4.    NO STOCKHOLDER  RIGHTS. This Warrant shall not entitle its holder to
any of the rights of a stockholder of the Company prior to its exercise.

      5.    RESERVATION OF STOCK.  The Company  covenants that during the period
this Warrant is  exercisable,  the Company will reserve from its  authorized and
unissued Common Stock a sufficient  number of shares to provide for the issuance
of Common Stock upon the exercise of this Warrant.  The Company  agrees that its
issuance of this Warrant shall constitute full authority to its officers who are
charged with the duty of executing  stock  certificates to execute and issue the
necessary  certificates  for shares of Common  Stock upon the  exercise  of this
Warrant.

                                      -2-
<PAGE>

      6.    EXERCISE OF  WARRANT.  Subject to the terms and  conditions  hereof,
this Warrant may be exercised by the holder hereof then  registered on the books
of the Company at any time during the exercise Period as set forth in Section 12
hereof. Subject to the foregoing, this Warrant may be exercised by the Holder or
its  registered  assigns,  in whole or in part and in  minimum  units of 100,000
shares, by the surrender of this Warrant at the principal office of the Company,
together with the attached form of  subscription  duly executed,  accompanied by
payment in full of the amount of the Warrant Price in the form described in this
Warrant.  Upon  partial  exercise  of this  Warrant,  a new  warrant or warrants
containing  the same date and  provisions as this Warrant shall be issued by the
Company to the  registered  holder for the number of shares of Common Stock with
respect to which this Warrant shall not have been exercised.  A Warrant shall be
deemed to have been exercised  immediately prior to the close of business on the
date of its surrender for exercise as provided above, and the person entitled to
receive the shares of Common Stock  issuable upon such exercise shall be treated
for all  purposes  as the  holder  of such  shares  of record as of the close of
business on such date.  As promptly as  practicable  on or after such date,  the
Company shall issue and deliver to the person or persons entitled to receive the
shares,  a certificate or  certificates  for the number of full shares of Common
Stock issuable upon such exercise, together with cash in lieu of any fraction of
a share as provided  above.

      7.    CERTIFICATE OF ADJUSTMENT. Whenever the Warrant Price is adjusted as
provided in Section 2, the Company shall  promptly  deliver to the record holder
of this Warrant a  certificate  of an officer of the Company  setting  forth the
relevant  Warrant  Price or number of shares after such  adjustment  and setting
forth a brief statement of the facts requiring such adjustment.

      8.    COMPLIANCE WITH  SECURITIES  ACT. The Holder,  by acceptance of this
Warrant,  agrees that this  Warrant and the shares of Common  Stock to be issued
upon its exercise (or shares of any security into which such Common Stock may be
converted)  (the "Shares") are being acquired for investment and that the Holder
will not offer,  sell,  or  otherwise  dispose of this Warrant and any shares of
Common  Stock to be issued upon its  exercise  (or shares of any  security  into
which such Common Stock may be converted) except under  circumstances which will
not  result in a  violation  of the  Securities  Act of 1933,  as  amended  (the
"Securities  Act").  Upon exercise of this Warrant,  the holder hereof shall, if
requested  by the  Company,  confirm  in  writing  its  investment  purpose  and
acceptance of the restrictions on transfer of the Shares.

      9.    SUBDIVISION OF WARRANT. At the request of the holder of this Warrant
in  connection  with a transfer or exercise of a portion of the Warrant and upon
surrender of this  Warrant for such  purpose to the Company,  the Company at its
expense  (except for any transfer tax payable)  will issue in exchange  therefor
warrants of like nature and date

                                      -3-
<PAGE>

representing  in the  aggregate  the right to purchase  such number of shares of
such  Common  Stock as shall be  designated  by such  holder at the time of such
surrender;  provided,  however,  that the  Company's  obligations  to  subdivide
securities  under this  Section  shall be subject  to and  conditioned  upon the
compliance of any such  subdivision  with applicable  state  securities laws and
with the Securities Act.

      10.   LOSS, THEFT, DESTRUCTION,  OR MUTILATION OF WARRANT. Upon receipt by
the  Company  of  evidence  reasonably  satisfactory  to it of the loss,  theft,
destruction,  or mutilation of this Warrant,  and in the case of loss, theft, or
destruction,  of  indemnity  or  security  reasonably  satisfactory  to  it  and
reimbursement to the Company of all reasonable  expenses  incidental thereto, in
the case of mutilation,  and upon surrender and cancellation of this Warrant the
Company  will make and  deliver a new Warrant of like tenor and dates as of such
cancellation, in lieu of this Warrant.

      11.   MISCELLANEOUS.  This  Warrant  shall be  governed by the laws of the
State of Texas. The headings in this Warrant are for purposes of convenience and
reference  only,  and shall not be deemed to  constitute a part of this Warrant.
Neither this Warrant nor any term included may be changed,  waived,  discharged,
or terminated  orally but only by an instrument in writing signed by the Company
and the Holder.  All notices  and other  communications  from the Company to the
Holder  shall  be by  telecopy  or  expedited  courier  service  to the  address
furnished to the Company in writing by the last holder of this Warrant who shall
have  furnished  an address to the  Company in  writing.  This  Warrant has been
issued pursuant to a Warrant  Purchase  Agreement dated as of June 15, 1999, the
terms of which, including certain repurchase provisions, are incorporated herein
by reference.  A copy of such Warrant Purchase Agreement may be inspected at the
office of the Company during normal business hours.

      12.   EXERCISE   PERIOD.   The  Exercise  Period  shall  mean  the  period
commencing on the date hereof and ending on August 18, 2004.

      ISSUED this 18, day of August, 1999.

                                              POSITRON CORPORATION

                                              By: /s/ Gary H. Brooks
                                                 -------------------------------
                                                    Gary H. Brooks, President

         ATTEST:

         ---------------------------

                                      -4-
<PAGE>

                               FORM OF ASSIGNMENT
                              POSITRON CORPORATION

      FOR VALUE RECEIVED the undersigned registered owner of this Warrant hereby
sells, assigns, and transfers unto the Assignee named below all of the rights of
the undersigned  under the within Warrant,  with respect to the number of shares
of Common Stock set forth below:

NAME OF ASSIGNEE                    ADDRESS                 NUMBER OF SHARES
----------------                    -------                 ----------------

The undersigned does hereby irrevocably  constitute and appoint  _______________
_______________________  Attorney to make such transfer on the books of POSITRON
CORPORATION  maintained for the purpose,  with full power of substitution in the
premises.

Dated:
      ----------------------

                                   ---------------------------------------------
                                   Name of Warrant Holder

                                   Signature:
                                             -----------------------------------

Witness:
        -----------------------

<PAGE>

                                SUBSCRIPTION FORM
                              POSITRON CORPORATION

                 (To be executed only upon exercise of Warrant)

      The undersigned  registered  owner of this Warrant  irrevocably  exercises
this  Warrant  for and  purchases  ________________  of the  number of shares of
Common Stock of POSITRON CORPORATION purchasable with this Warrant, and herewith
makes  payment  therefor,  all at the  price  and on the  terms  and  conditions
specified in this Warrant.

Dated:
      ---------------------

                                      ------------------------------------------
                                      (Signature of Registered Owner)

                                      ------------------------------------------
                                      (Street Address)

                                      ------------------------------------------
                                      (City)             (State)      (Zip Code)

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00001-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00001-of-00352.parquet"}]]