Exhibit 32.1

      CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT
                TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

      In connection with the Quarterly Report on Form 10-Q of Lightbridge, Inc.
(the "Company") for the quarter ended March 31, 2004, as filed with the
Securities and Exchange Commission on May 10, 2004 (the "Report"), each of the
undersigned Chief Executive Officer and Chief Financial Officer of the Company,
certifies, to the best knowledge and belief of the signatory, pursuant to 18
U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley
Act of 2002, that:

      (1)   The Report fully complies with the requirements of Section 13(a) or
            15(d) of the Securities Exchange Act of 1934; and

      (2)   The information contained in the Report fairly presents, in all
            material respects, the financial condition and results of operations
            of the Company.

      /s/ Pamela D.A. Reeve                            /s/ Harlan Plumley
      -----------------------------                    -------------------------
      Pamela D.A. Reeve                                Harlan Plumley
      President and Chief Executive Officer            Chief Financial Officer

      Date: May 10, 2004                                 Date: May 10, 2004