Rapid determination of 99Tc in water samples using Ti(OH)3-TcO2 co-precipitation and TK200 resin by liquid scintillation counting

Ni Yuan, Quan An, Shan Xing*, Xiongxin Dai, Xiaolin Hou, Yonggang Yang, Yan Ma

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A novel method for the determination of 99Tc in water samples was developed using stable Re as a chemical yield tracer and TiCl3 as a reducing agent. The influences of several experimental parameters, including TiCl3 concentration, HCl concentration and reaction time, on the reduction of TcO4 and ReO4 as well as Ti(OH)3-TcO2-ReO2 co-precipitation were investigated. Tc(VII) and Re(VII) retained on TK200 resin were effectively eluted by 5 mL of 1 mol/L NH4SCN, which can be directly mixed with the scintillation cocktail for liquid scintillation counting. The results show that the chemical behaviors of Tc and Re are very consistent in the whole procedure. The decontamination factors of potential interferences from β-emitting nuclides mainly released from nuclear fuel reprocessing plants were also evaluated, and the minimum detectable activity concentration was calculated to be 0.08 Bq/L for 99Tc in water samples with a counting time of 2 h.
Original languageEnglish
Article number106954
JournalJournal of Environmental Radioactivity
Volume251–252
Number of pages6
ISSN0265-931X
DOIs
Publication statusPublished - 2022

Keywords

  • Technetium-99
  • Rhenium
  • TiCl3
  • TK200 resin
  • Liquid scintillation counting

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