1 / 18

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.

Download Presentation

Technical Updates on UTEVA Resin and TEVA Resin

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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

More Related