UNSECURED PROMISSORY NOTE

$3,000,000                                        August 29, 2000

     FOR VALUE RECEIVED, the undersigned, PERMA-FIX ENVIRONMENTAL
SERVICES,  INC., a Delaware corporation ("Maker"),   promises  to
pay to the order of RBB BANK AKTIENGESELLSCHAFT, a bank organized
under  the  laws of Austria, and having its principal offices  at
Burgring 16, 8010 Graz, Austria ("Payee"), in lawful money of the
United States of America, the principal sum of Three Million  and
no/100 Dollars ($3,000,000), together with interest on the unpaid
principal balance at an annual rate equal to 12.0%  in the manner
provided  below. Interest shall be calculated on the basis  of  a
year  of  365  days  and charged for the actual  number  of  days
elapsed.

1. PAYMENTS

1.1 PRINCIPAL AND INTEREST

The  principal  amount of this Note and accrued interest  thereon
shall be payable in full on November 29, 2000.

1.2 MANNER OF PAYMENT

All  payments  of principal and interest on this  Note  shall  be
delivered to Payee within ten (10) days of the due date described
in  Section  1.1 at Burgring 16, 8101 Graz, Austria  or  at  such
other place as Payee shall designate to Maker in writing. If  any
payment  of principal or interest on this Note is due  on  a  day
which  is  not a Business Day, such payment shall be due  on  the
next succeeding Business Day.  "Business Day" means any day other
than  a  Saturday,  Sunday  or legal  holiday  in  the  State  of
Delaware.

1.3 PREPAYMENT

Maker may, without premium or penalty, at any time and from  time
to  time,  prepay all or any portion of the outstanding principal
balance  due under this Note, provided that each such  prepayment
is  accompanied  by accrued interest on the amount  of  principal
prepaid  calculated to the date of such prepayment.  Any  partial
prepayments  shall be applied to reduce the principal  under  the
Note.

        THE REMAINDER OF THIS PAGE IS INTENTIONALLY BLANK





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2. DEFAULTS

2.1 EVENTS OF DEFAULT

The  occurrence of any one or more of the following  events  with
respect  to Maker shall constitute an event of default  hereunder
("Event of Default"):

(a)  If Maker shall fail to pay when due any payment of principal
or  interest on this Note and such failure continues for  fifteen
(15)  days after Payee notifies Maker in writing of such  failure
to pay;

(b)  If,  pursuant to or within the meaning of the United  States
Bankruptcy  Code  or any other federal or state law  relating  to
insolvency or relief of debtors (a "Bankruptcy Law"), Maker shall
(i)  commence a voluntary case or proceeding; (ii) consent to the
entry  of an order for relief against it in an involuntary  case;
(iii)   consent  to  the  appointment  of  a  trustee,  receiver,
assignee, liquidator or similar official; (iv) make an assignment
for  the  benefit of its creditors; or (v) admit in  writing  its
inability to pay its debts as they become due; or

(c)  If  a  court of competent jurisdiction enters  an  order  or
decree  under  any Bankruptcy Law that (i) is for relief  against
Maker  in an involuntary case, (ii) appoints a trustee, receiver,
assignee,  liquidator  or  similar  official  for  Maker  or  for
substantially  all  of Maker's properties, or  (iii)  orders  the
liquidation of Maker, and in each case the order or decree is not
dismissed within 90 days.

2.2 REMEDIES

Upon the occurrence of an Event of Default hereunder (unless  all
Events  of Default have been cured by Maker or waived by  Payee),
Payee may, at its option, (i) by written notice to Maker, declare
the  entire unpaid principal balance of this Note, together  with
all   accrued  interest  thereon,  immediately  due  and  payable
regardless  of any prior forbearance, and (ii) exercise  any  and
all  rights  and  remedies available to it under applicable  law,
including,  without limitation, the right to collect  from  Maker
all  sums  due  under this Note. Maker shall pay  all  reasonable
costs  and  expenses  incurred  by  or  on  behalf  of  Payee  in
connection with Payee's exercise of any or all of its rights  and
remedies   under   this  Note,  including,  without   limitation,
reasonable attorneys' fees.

3. MISCELLANEOUS

3.1 WAIVER

The  rights  and  remedies  of Payee under  this  Note  shall  be
cumulative and not alternative. No waiver by Payee of  any  right
or  remedy under this Note shall be effective unless in a writing
signed  by Payee. Neither the failure nor any delay in exercising
any  right, power or privilege under this Note will operate as  a
waiver of such right, power or privilege and no single or partial
exercise  of  any such right, power or privilege  by  Payee  will
preclude  any other or further exercise of such right,  power  or
privilege or the exercise of any other right, power or privilege.
To  the maximum extent permitted by applicable law, (a) no  claim

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or  right of Payee arising out of this Note can be discharged  by
Payee,  in whole or in part, by a waiver or renunciation  of  the
claim  or  right  unless in a writing, signed by  Payee;  (b)  no
waiver  that may be given by Payee will be applicable  except  in
the specific instance for which it is given; and (c) no notice to
or  demand  on  Maker  will be deemed  to  be  a  waiver  of  any
obligation  of  Maker or of the right of Payee  to  take  further
action  without notice or demand as provided in this Note.  Maker
hereby waives presentment, demand, protest and notice of dishonor
and protest.

3.2 NOTICES

Except  as  otherwise  specified  herein  to  the  contrary,  all
notices,  requests, demands and other communications required  or
desired to be given hereunder shall only be effective if given in
writing,  by  hand  or by fax, by certified or  registered  mail,
return  receipt  requested, postage prepaid, or by  U.S.  Express
Mail service, or by private overnight mail service (e.g., Federal
Express).  Any such notice shall be deemed to have been given (i)
on the business day actually received if given by hand or by fax,
(ii)  on  the business day immediately subsequent to mailing,  if
sent  by  U.S.  Express  Mail service or private  overnight  mail
service,  or  (iii) five (5) business days following the  mailing
thereof,  if  mailed  by  certified or registered  mail,  postage
prepaid, return receipt requested, and all such notices shall  be
sent  to  the  following addresses (or to such other  address  or
addresses  as  a party may have advised the other in  the  manner
provided in this Section 3.2):

If to the Maker:    c/o Dr. Louis F. Centofanti
                    Perma-Fix Environmental Services, Inc.
                    1940 Northwest 67th Place
                    Gainesville, Florida 32653
                    Fax No.: (352) 373-0040

with copies simultaneously
by like means to:   Irwin H. Steinhorn, Esquire
                    Conner & Winters
                    One Leadership Square, Suite 1700
                    211 North Robinson
                    Oklahoma City, Oklahoma 73102
                    Fax No.: (405) 232-2695

If to the Payee:    Herbert Strauss
                    RBB Bank Aktiengesellschaft
                    Burgring 16, 8010 Graz, Austria
                    Fax No.: 011-43-316-8072 ext. 392




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3.3 SEVERABILITY

If any provision in this Note is held invalid or unenforceable by
any court of competent jurisdiction, the other provisions of this
Note  will remain in full force and effect. Any provision of this
Note  held  invalid or unenforceable only in part or degree  will
remain  in full force and effect to the extent not  held  invalid
or unenforceable.

3.4 GOVERNING LAW

This  Note will be governed by the laws of the State of  Delaware
without regard to conflicts of laws principles.

3.5 PARTIES IN INTEREST

This Note shall bind Maker and its successors and assigns.

3.6 SECTION HEADINGS, CONSTRUCTION

The   headings  of  Sections  in  this  Note  are  provided   for
convenience  only  and  will  not  affect  its  construction   or
interpretation.  All references to "Section" or "Sections"  refer
to  the  corresponding Section or Sections of  this  Note  unless
otherwise specified.

All  words  used in this Note will be construed  to  be  of  such
gender  or  number as the circumstances require. Unless otherwise
expressly  provided,  the  words  "hereof"  and  "hereunder"  and
similar references refer to this Note in its entirety and not  to
any specific section or subsection hereof.

IN WITNESS WHEREOF, Maker has executed and delivered this Note as
of the date first stated above.


                         PERMA-FIX ENVIRONMENTAL SERVICES, INC.,
                         a Delaware corporation


                         By:  /s/ Louis Centofanti
                              ___________________________________
                               Dr. Louis F. Centofanti, President



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