Technetium-99 in Urine

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Technetium-99 in Urine

• Tabitha Liebrecht Buzz Vickery
• Severn Trent Laboratories Richland
• 2800 George Washington Way
• Richland, Wa 99352
• [phone]

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Advantages of Eichrom Method(Summary)

• Time saving
• Waste reduction
• Yield

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Method Summary(Step One - Urine Prep)

• Sample Pour-up
• Prepare Sample

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Method Summary(Step Two - Separations and
Counting)

• Acid Digestion/Transfer
• Prepare sample for TEVA disk
• Filter/Separation via TEVA disc
• Prepare sample for LSC

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Ion Exchange vs. TEVA Disc

• Ion Exchange method spike yield (1999)
• 300ml sample size w/ 85.04 yield
• TEVA disc method spike yield (2000)
• 300ml sample size w/ 95.23 yield
• Yield increase
• Average of 10 increase in spike recovery

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Ion Exchange vs. TEVA Disc (continued)

• tSIE improvement _at_ 100
• Lum improvement _at_ 66.0
• New method MDA improvement _at_ 15
• Contractual MDA 35 pCi/L

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Ion Exchange vs. TEVA Disc (continued)

• Analysis time saving
• 48 hours vs 12 hours
• Cost Savings (11 samples/batch)
• 75 savings per batch (FTE)

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Waste Summary

• 800ml vs 350ml of acidic waste
• 60 decrease in waste produced
• Waste disposal savings of 0.66 per sample
  analyzed

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Conclusions

• Improved TAT
• Decreased waste
• Increased yields
• Lower MDA
• Improved reliability

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Future Eichrom Projects

• Np-237 by TEVA with ICP/MS (via Eichrom ACW08 and
  ACU03)
• Th separation
• Am/Pu/U by TRU/UTEVA (via Eichrom ACW03)
• Strontium by Sr resin (via SRW01)
• Tc-99 in soil
• Pb-210 Single Operator Test

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Thanks to EichromAnil Thakkar and Larry Jassin