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| $ 1,321,876.00 |   | September 28, 2010 |
|----------------|--------|--------------------|

|   | 1. | The Payor at any time defaults in the payment to the Payee of any installment of principal or interest when due and payable under this Note and such default is not cured within 15 days after receipt of notice from the Payor to the Payee; or |
|--------|----|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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|   | 2. | If (a) the Payor commences any case, proceeding, or other action  (i) relating to bankruptcy, insolvency, reorganization, or relief of debtors, seeking to have an order for relief entered with respect to it, or seeking to adjudicate it a bankrupt or insolvent, or seeking reorganization, arrangement, adjustment, winding up, liquidation, dissolution, composition, or other similar relief with respect to it or its debts; or (ii) seeking appointment of a receiver, trustee, custodian, or other similar official for it, or for all or any substantial part of its assets, or making a general assignment for the benefit of its creditors; or (b) there is commenced against Payor any case, proceeding or other action of a nature referred to in clause (a) above which results in the entry of an order for relief or any such adjudication or appointment, or remains dismissed, undischarged, or unbonded for a period of 60 days; or (c) there is commenced against Payor any case, proceeding, or other action seeking issuance of a warrant of attachment, execution or similar process against all or any substantial part of its assets which results in the entry of an order for any such relief which is vacated, discharged, stayed or bonded pending appeal within 60 days from the entry thereof; or (d) any action is taken by Payor in furtherance of, or indicating its consent to, approval of, or acquiescence in, any of the acts set forth in clause (a), (b) or (c) above; or (e) Payor does not, or is unable to, or admits in writing its inability to, pay its debts as they become due. |
|--------|----|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | PERMA-FIX ENVIRONMENTAL SERVICES, INC., a Delaware corporation |
|--------|----------------------------------------------------------------|
|   |                                                           |   |
|   |                                                           |   |
|   | By:                                                            | /s/ Ben Naccarato |
|   | Name:                                                          | Ben Naccarato |
|   | Title:                                                         | Chief Financial Officer |

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| Nuvotec Earnout           |   |   |         |
|---------------------------|--------|--------|--------------|
| Principal                 |   | $      | 2,885,385.00 |   |
| Principal Payment upfront |   | $      | 1,000,000.00 |   |
| Hold Back                 |   | $      | 563,509.00   |   |
| Principal Balance         |   | $      | 1,321,876.00 |   |
| Interest Rate             |   |   | 6.00         | % |
| Term 3 Years              |   |   |         |   |

| Start Date |   | Principal |         |   | Interest |   |     | Monthly Payment |   |
|------------|--------|-----------|--------------|--------|----------|--------|----------|-----------------|--------|
| 10/15/2010 |   | $         | 1,321,876.00 |   |     | $      | 3,304.69 |            |   | $ | 40,170.22 |   |
| 11/15/2010 |   | $         | 1,285,010.47 |   |     | $      | 6,639.22 |            |   | $ | 40,170.22 |   |
| 12/15/2010 |   | $         | 1,251,479.47 |   |     | $      | 6,465.98 |            |   | $ | 40,170.22 |   |
| 1/15/2011  |   | $         | 1,217,775.22 |   |     | $      | 6,291.84 |            |   | $ | 40,170.22 |   |
| 2/15/2011  |   | $         | 1,183,896.84 |   |     | $      | 6,116.80 |            |   | $ | 40,170.22 |   |
| 3/15/2011  |   | $         | 1,149,843.41 |   |     | $      | 5,365.94 |            |   | $ | 40,170.22 |   |
| 4/15/2011  |   | $         | 1,115,039.13 |   |     | $      | 5,761.04 |            |   | $ | 40,170.22 |   |
| 5/15/2011  |   | $         | 1,080,629.94 |   |     | $      | 5,403.15 |            |   | $ | 40,170.22 |   |
| 6/15/2011  |   | $         | 1,045,862.87 |   |     | $      | 5,403.62 |            |   | $ | 40,170.22 |   |
| 7/15/2011  |   | $         | 1,011,096.27 |   |     | $      | 5,055.48 |            |   | $ | 40,170.22 |   |
| 8/15/2011  |   | $         | 975,981.53   |   |     | $      | 5,042.57 |            |   | $ | 40,170.22 |   |
| 9/15/2011  |   | $         | 940,853.88   |   |     | $      | 4,861.08 |            |   | $ | 40,170.22 |   |
| 10/15/2011 |   | $         | 905,544.73   |   |     | $      | 4,527.72 |            |   | $ | 40,170.22 |   |
| 11/15/2011 |   | $         | 869,902.23   |   |     | $      | 4,494.49 |            |   | $ | 40,170.22 |   |
| 12/15/2011 |   | $         | 834,226.51   |   |     | $      | 4,171.13 |            |   | $ | 40,170.22 |   |
| 1/15/2012  |   | $         | 798,227.42   |   |     | $      | 4,124.17 |            |   | $ | 40,170.22 |   |
| 2/15/2012  |   | $         | 762,181.37   |   |     | $      | 3,937.94 |            |   | $ | 40,170.22 |   |
| 3/15/2012  |   | $         | 725,949.08   |   |     | $      | 3,508.75 |            |   | $ | 40,170.22 |   |
| 4/15/2012  |   | $         | 689,287.61   |   |     | $      | 3,561.32 |            |   | $ | 40,170.22 |   |
| 5/15/2012  |   | $         | 652,678.71   |   |     | $      | 3,263.39 |            |   | $ | 40,170.22 |   |
| 6/15/2012  |   | $         | 615,771.88   |   |     | $      | 3,181.49 |            |   | $ | 40,170.22 |   |
| 7/15/2012  |   | $         | 578,783.15   |   |     | $      | 2,893.92 |            |   | $ | 40,170.22 |   |
| 8/15/2012  |   | $         | 541,506.84   |   |     | $      | 2,797.79 |            |   | $ | 40,170.22 |   |
| 9/15/2012  |   | $         | 504,134.40   |   |     | $      | 2,604.69 |            |   | $ | 40,170.22 |   |
| 10/15/2012 |   | $         | 466,568.87   |   |     | $      | 2,332.84 |            |   | $ | 40,170.22 |   |
| 11/15/2012 |   | $         | 428,731.50   |   |     | $      | 2,215.11 |            |   | $ | 40,170.22 |   |
| 12/15/2012 |   | $         | 390,776.39   |   |     | $      | 1,953.88 |            |   | $ | 40,170.22 |   |
| 1/15/2013  |   | $         | 352,560.04   |   |     | $      | 1,821.56 |            |   | $ | 40,170.22 |   |
| 2/15/2013  |   | $         | 314,211.38   |   |     | $      | 1,623.43 |            |   | $ | 40,170.22 |   |
| 3/15/2013  |   | $         | 275,664.58   |   |     | $      | 1,286.43 |            |   | $ | 40,170.22 |   |
| 4/15/2013  |   | $         | 236,780.80   |   |     | $      | 1,223.37 |            |   | $ | 40,170.22 |   |
| 5/15/2013  |   | $         | 197,833.94   |   |     | $      | 989.17   |            |   | $ | 40,170.22 |   |
| 6/15/2013  |   | $         | 158,652.89   |   |     | $      | 819.71   |            |   | $ | 40,170.22 |   |
| 7/15/2013  |   | $         | 119,302.37   |   |     | $      | 596.51   |            |   | $ | 40,170.22 |   |
| 8/15/2013  |   | $         | 79,728.66    |   |     | $      | 411.93   |            |   | $ | 40,170.22 |   |
| 9/15/2013  |   | $         | 39,970.37    |   |     | $      | 199.85   |            |   | $ | 40,170.22 |   |
| 10/15/2013 |   | $         | (0.00        | )      |     | $      | (0.00    | )               |   | $ | - |   |

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