Journal of Radioanalytical and Nuclear Chemistry

, Volume 150, Issue 2, pp 493–507 | Cite as

Radiochenical determination of technetium-99 in LLW by chelation with sodium diethyl dithiocarbamate (NaDDC) and extraction with chloroform

  • J. H. Chiu
  • T. C. Chu
  • P. S. Weng
Article

Abstract

A radiochemical method has been developed for the determination of99Tc in low-level radioactive, waste from nuclear facilities, using99mTc as an internal tracer. Radioactive contaminants were removed by carrier hydroxide precipitation and chelating extraction with NaDDC/CHCl3 system at pH 4. The final technetium was chelated with NaDDC in 3N HCl solution and extracted selectively into chloroform. The average of radiochemical recovery for various types of LLW sample is about 90%. The decontamination factors for most radioactive nuclides are higher than 105. The detection limit for99Tc in a sample of about 10 g is 0.17 pCi/g (6.5 Bq·kg−1) for a 100-minute count.

Keywords

Precipitation Chloroform Diethyl Technetium Dithiocarbamate 

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Copyright information

© Akadémiai Kiadó 1991

Authors and Affiliations

  • J. H. Chiu
    • 1
  • T. C. Chu
    • 1
  • P. S. Weng
    • 1
  1. 1.Institute of Nuclear ScienceNational Tsing Hua UniversityHsinchuTaiwan (Republic of China)

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