Exhibit
      31.2





CERTIFICATION





I,
      Francis J. Tarallo, Chief Financial Officer, certify that:





1. I
      have
      reviewed this report on Form 10-K of Theragenics Corporation;





2. Based
      on my
      knowledge, this annual report does not contain any untrue statement of a
      material fact or omit to state a material fact necessary to make the statements
      made, in light of the circumstances under which such statements were made,
      not
      misleading with respect to the period covered by this report;





3. Based
      on my
      knowledge, the financial statements, and other financial information included
      in
      this report, fairly present in all material respects the financial condition,
      results of operations and cash flows of the registrant as of, and for, the
      periods presented in this report;





4. The
      registrant's other certifying officer and I are responsible for establishing
      and
      maintaining disclosure controls and procedures (as defined in Exchange Act
      Rules
      13a-15(e) and 15d-15(e)) and internal control over financial reporting (as
      defined in Exchange Act Rules 13a-15(f) and 15(d)-15(f))) for the registrant
      and
      have:





a) designed
      such
      disclosure controls and procedures, or caused such disclosure controls and
      procedures to be designed under our supervision, to ensure that material
      information relating to the registrant, including its consolidated subsidiaries,
      is made known to us by others within those entities, particularly during the
      period in which this report is being prepared;





b) designed
      such
      internal control over financial reporting, or caused such internal control
      over
      financial reporting to be designed under our supervision, to provide reasonable
      assurance regarding the reliability of financial reporting and the preparation
      of financial statements for external purposes in accordance with generally
      accepted accounting principles;





c) evaluated
      the
      effectiveness of the registrant's disclosure controls and procedures and
      presented in this report our conclusions about the effectiveness of the
      disclosure controls and procedures, as of the end of the period covered by
      this
      report based on such evaluation; and





d) disclosed
      in
      this report any change in the registrant's internal control over financial
      reporting that occurred during the registrant's most recent fiscal quarter
      that
      has materially affected, or is reasonably likely to materially affect, the
      registrant's internal control over financial reporting.





5. The
      registrant's other certifying officer and I have disclosed, based on our most
      recent evaluation of internal control over financial reporting, to the
      registrant's auditors and the audit committee of the registrant's board of
      directors (or persons performing the equivalent functions):





a) all
      significant deficiencies and material weaknesses in the design or operation
      of
      internal control over financial reporting which are reasonably likely to
      adversely affect the registrant's ability to record, process, summarize and
      report financial information; and




b) any
      fraud,
      whether or not material, that involves management or other employees who have
      a
      significant role in the registrant's internal control over financial
      reporting.





Date:
      March 13, 2006







/s/
      Francis J. Tarallo


Francis
      J. Tarallo


Chief
      Financial Officer