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Determination of technetium-99 from model and rad-waste samples

Determination of technetium-99 from model and rad-waste samples. Martina Ferenco vá, Peter Tkáč Department of Nuclear Chemistry, Faculty of Natural Sciences,. Comenius University, Bratislava, Slovakia. LiquiScint 2004 , LSC in Radiochemistry and Environmental Sciences , Prague, 17-18th May.

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Determination of technetium-99 from model and rad-waste samples

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  1. Determination of technetium-99 from model and rad-waste samples Martina Ferencová, Peter Tkáč Department of Nuclear Chemistry, Faculty of Natural Sciences, Comenius University, Bratislava, Slovakia

  2. LiquiScint 2004, LSC in Radiochemistry and Environmental Sciences, Prague, 17-18th May • Aims of the work • Find out fast and suitable separation technique • Define percentage yield after each separation step • Study the separation of technetium from model samples • Study the separation of technetium from real rad-waste samples • Compare this separation method with commercial TEVA resin TM Ferencová M., Tkáč P., Determination of technetium-99 from model and rad-waste samples

  3. LiquiScint 2004, LSC in Radiochemistry and Environmental Sciences, Prague, 17-18th May Separation scheme sample leaching precipitation anex separation extraction measuring Ferencová M., Tkáč P., Determination of technetium-99 from model and rad-waste samples

  4. LiquiScint 2004, LSC in Radiochemistry and Environmental Sciences, Prague, 17-18th May Leaching solution Average yield 8 M HNO3→ 80.7 % 2 M H2SO4 → 75.8 % 2 M H2SO4 + pers. → 77.5 % Ferencová M., Tkáč P., Determination of technetium-99 from model and rad-waste samples

  5. LiquiScint 2004, LSC in Radiochemistry and Environmental Sciences, Prague, 17-18th May Precipitation of Fe3+ ions Ferencová M., Tkáč P., Determination of technetium-99 from model and rad-waste samples

  6. LiquiScint 2004, LSC in Radiochemistry and Environmental Sciences, Prague, 17-18th May Extraction with TPACl 1M H2SO4 1M NH4OH 2M NH4OH 1M Na2CO3 2M Na2CO3 H2O 0.05M NaNO3 0.01M NaNO3 0.5M H2SO4 0.01M HNO3 0.05M HNO3 Ferencová M., Tkáč P., Determination of technetium-99 from model and rad-waste samples

  7. LiquiScint 2004, LSC in Radiochemistry and Environmental Sciences, Prague, 17-18th May Yields of 99mTc from soil model samples after each separation step, with 8 M HNO3 used as leaching acid Ferencová M., Tkáč P., Determination of technetium-99 from model and rad-waste samples

  8. LiquiScint 2004, LSC in Radiochemistry and Environmental Sciences, Prague, 17-18th May Cs-137 decontamination after each separation step Yields of Tc after each separation step Activity of Tc-99 added at start of separation procedure was 0.81 ± 0.031 Bq Ferencová M., Tkáč P., Determination of technetium-99 from model and rad-waste samples

  9. LiquiScint 2004, LSC in Radiochemistry and Environmental Sciences, Prague, 17-18th May Real sample 1: concentrate solution Ferencová M., Tkáč P., Determination of technetium-99 from model and rad-waste samples

  10. LiquiScint 2004, LSC in Radiochemistry and Environmental Sciences, Prague, 17-18th May Real sample 2: building debris Ferencová M., Tkáč P., Determination of technetium-99 from model and rad-waste samples

  11. LiquiScint 2004, LSC in Radiochemistry and Environmental Sciences, Prague, 17-18th May Real sample 3: scraped dye Ferencová M., Tkáč P., Determination of technetium-99 from model and rad-waste samples

  12. LiquiScint 2004, LSC in Radiochemistry and Environmental Sciences, Prague, 17-18th May CONCLUSION • was designed the separation method for determination of Tc-99 from solid and liquid samples • was determined the separation yield after each separation step • was verified the availability of prepared method for determination of Tc-99 • was compared values of 99Tc determined by our separation procedure and by commercial sorbent TEVA resin Ferencová M., Tkáč P., Determination of technetium-99 from model and rad-waste samples

  13. LiquiScint 2004, LSC in Radiochemistry and Environmental Sciences, Prague, 17-18th May Thank you for your attention ;-)

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