Wachovia Bank, N.A.Credit
Products ManagementGA97683414 Peachtree Road, N.E.Suite
500Atlanta, GA 30326

WACHOVIA

July 8, 2003

James MacLennan  Chief Financial
OfficerTheragenics Corporation5203 Bristol Industrial Way Buford, Georgia 30518

|RE: |  | Credit Agreement, dated August 30, 1999, between Theragenics Corporation
(Borrower) and Wachovia Bank, National Association (Wachovia), as
amended from time to time (Credit Agreement), Master Note A from
Borrower to Wachovia in the original principal amount of $35,000,000 dated August 30,
1999, including any amendments and Master Note B from Borrower to Wachovia in the original
principal amount of $5,000,000 dated August 30, 1999, including any amendments (Master
Note A & B collectively known as Master Notes)
|--- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Obligor
# 8887108841 Obligation #s 0001215706 & 0001215763

Dear James:

Wachovia and Borrower agree to extend
the maturity of the Master Notes on the terms and conditions set forth in this letter
agreement.

Extension.    
          Borrower acknowledges that the Master Notes will mature on August 30, 2003.
          Borrower and Wachovia agree that the Termination Date of the Master Notes as
          stated in the Credit Agreement shall be extended to October 31, 2003, at which
          time the outstanding principal balance, accrued interest and all other amounts
          under the Master Notes shall become due and payable. This extension is granted
          on the same terms and conditions as presently in effect.All periodic
          payments required under the Master Notes shall be made during this extension
          period.

Affirmations of Borrower.
Borrower affirms and represents that the most recent commercial loan invoice received by
Borrower with respect to the Obligations (as defined in the Credit Agreement) is correct,
that the Master Notes, as modified hereby, and other Loan Documents (as defined in the
Credit Agreement) are in full force and effect, that Borrower has no defense to payment or
performance of the Obligations, that no setoffs against the Obligations exist, and that
Borrower has no counterclaims against Bank. Borrower ratifies and confirms all provisions
of the Master Notes and other Loan Documents and affirms that the maturity date is the
only provision of the Loan Documents that has been modified.

Please indicate your agreement with
the terms, affirmations and representations of this letter agreement by signing it as
provided below and returning it to the undersigned within 10 days of the date hereof. This
Agreement may be signed in counterparts. Should you have any questions, do not hesitate to
call.

| |                                                            
| | -----------------------------------------------------------
| | Very truly yours,                                          
| |                                                            
| | Wachovia Bank, National Association                        
| |                                                            
| | By:  /s/ Michael J. RamanoMichael J. Romano, Vice President
| |                                                            

---

Borrower agrees to the terms of the
above letter agreement this 11th day of July, 2003 and certifies that
this Agreement was executed in the State of Georgia and delivered to Wachovia in the State
of Georgia.

| |                                                                                                          
| | ---------------------------------------------------------------------------------------------------------
| | THERAGENICS CORPORATION
 TIN:58-1528626                                                                  
|
| | By:/s/ James MacLennan

Name:    James MacLennan

Title:    Chief Financial Officer                      
|
| | Acknowleded by Guarantor:
 THERAGENICS INTERNATIONAL CORPORATION
 TIN:98-0233348                         
| | By:/s/ M. Christine Jacobs

Name:    M. Christine Jacobs

Title:    President and Chief Executive Officer