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Technical Updates on UTEVA Resin and TEVA Resin

Technical Updates on UTEVA Resin and TEVA Resin. Denver May 2, 2002. Topics. UTEVA Resin: Decontamination of Po-210 U-232 yields TEVA Resin: Decontamination of U-nat/Th in Tc-99 region. U-232 Yields.

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Technical Updates on UTEVA Resin and TEVA Resin

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  1. Technical Updates on UTEVA Resin and TEVA Resin Denver May 2, 2002

  2. Topics • UTEVA Resin: • Decontamination of Po-210 • U-232 yields • TEVA Resin: • Decontamination of U-nat/Th in Tc-99 region

  3. U-232 Yields • Unrealistic high U-232 yields reported with UTEVA resin in samples with high in Pb-210

  4. Current Procedure 1) Load sample on UTEVA resin with 10 ml of 3M HNO3/1M Al(NO3)3. with 2 mL of 0.6M Ferrous sulfamate and 200 mg of ascorbic acid. 2) Rinse sample beaker with 5 mL of 3M HNO3 3) Rinse column with 5 mL of 3M HNO3 4) Rinse column with 5 mL of 9M HCl 5) Rinse column with 20 mL of 5M HCl/0.05M Oxalic 6) Elute U with 15 mL of 0.01M HCl

  5. Effect of Ferrous210Pb/210Po spike (1100 pCi)

  6. Effect of Additional 3M HNO3 Rinse210Pb/210Po spike

  7. Effect of Uranium Strip Solution no ferrous added210Pb/210Po spike (1100 pCi)

  8. Additional Rinse/1M HCl Strip Combo

  9. Revised Procedure 1) Load sample on UTEVA with 10 ml of 3M HNO3/1M Al(N03)3 with 2 mL of 0.6M Ferrous sulfamate and 200 mg of ascorbic acid 2) Rinse sample beaker with 5 mL of 3M HNO3 3) Rinse column with 5 mL of 3M HNO3 4) Rinse column with 10 mL of 3M HNO3 (3x) 5) Rinse column with 5 mL of 9M HCl 6) Rinse column with 20 mL of 5M HCl/0.05M Oxalic 7) Elute U with 15 mL of 1M HCl

  10. Summary A good decontamination of Po-210 in U-232 region can be achieved by additional 3M HNO3 rinse on UTEVA and eluting uranium selectively with 1M HCl

  11. TEVA Column: Tc-99 Issues • Problem reported by Darrin Mann (BWXT, Oak Ridge, Tn) with bias high Tc-99 recoveries in samples with natural uranium. • Th-234 interference was detected in Tc-99 region.

  12. BWXT’s Tc-99 Procedure • Solid samples are digested and dissolved finally in 20 ml of 0.1M HNO3 • Load sample on TEVA column • Rinse column with 25 ml of 0.1M HNO3 • Extrude resin from the column in a LSC vial. • Add cocktail and count on LSC.

  13. BWXT’s Procedure tested at Eichrom • Spiked 20 ml of 0.01M HNO3 with ~2000 dpm of U-234/238 • Load on TEVA Resin column • Rinse with 25 ml of 0.1M HNO3 • Extrude resin in LSC vial • Added 15 ml of cocktail and count

  14. Possible Solutions for Decontamination • Use of fluoride to complex the residual Th-234 on the column • Two fluoride solutions tested: • Hydrofluoric acid • Sodium fluoride

  15. Decontamination of Th-234 • Spiked 20 ml of 0.01HNO3 with ~2000 dpm of U-234/238 • Load on TEVA Resin column • Rinse with 5 ml of 0.1M HNO3 • Rinse with 25 ml of 0.5M HF/0.02M HNO3OR with 25 ml of 1M NaF/0.02 HNO3 • Rinse with 5 ml of 0.1 HNO3 • Extrude resin in LSC vial • Added 15 ml of cocktail and count

  16. BWXT’s ProcedureTest ResultsRinse volume used=25 mL

  17. Conclusion • Decontamination of Th-234 in Tc-99 region can be accomplished with additional fluoride rinse on the TEVA Resin columns • Fluoride in the form of 1M NaF or 0.5M HF solutions could be used to remove the residual amounts of Th-234

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