論文

査読有り
2018年

Results of a collaborative experiment on a correction of the true coincidence summing effect for 134Cs

Bunseki Kagaku
  • Chushiro Yonezawa
  • ,
  • Kazutoshi Kakita
  • ,
  • Takanori Takahashi
  • ,
  • Tatsuo Aono
  • ,
  • Satoshi Maeda
  • ,
  • Fumihiro Arakawa
  • ,
  • Nobuharu Kihou
  • ,
  • Masakazu Akiyama
  • ,
  • Hidetake Ishizu
  • ,
  • Yukiko Okada
  • ,
  • Mitsuya Yoshida
  • ,
  • Shinya Namura
  • ,
  • Takashi Yamada
  • ,
  • Shoji Hirai

67
4
開始ページ
213
終了ページ
220
記述言語
日本語
掲載種別
研究論文(学術雑誌)
DOI
10.2116/bunsekikagaku.67.213
出版者・発行元
Japan Society for Analytical Chemistry

The results of the International Inter-Comparison Exercise (IICE) of a fish certified reference material suggested that true coincidence summing (TCS) correction by a method widely used in Japan is insufficient for 134Cs. Thus, the committee for the preparation of reference materials for radioactivity analysis of JSAC conducted a collaborated experiment for the determination of 134Cs and 137Cs radioactivity of standard sources of those nuclides to validate the TCS correction from 4th January to 4th April 2017. A total of twelve Japanese laboratories participated in this experiment. Two standard sources of 134Cs, and a mixture of 134Cs and137Cs with cylindrical shape were passed along the laboratories to determine the radioactivity of 134Cs and137Cs of the sources. The metrological traceability is ensured in terms of the radioactivity of the standard sources. The laboratories analyzed the standard sources using a gamma-ray spectrometer, and reported the analysis results together with measured raw data and their related information to the organizer. The measured data were analyzed by the organizer using two Japanese gamma-ray spectrum analysis programs independently. The analysis results between the laboratories and the organizer almost agreed. The analysis results of 134Cs and 137Cs of two standard sources were lower by 2.3% to 5.2% than the reference values. While the -2.3% difference for 137Cs is still within the rage of the standard uncertainty of the reference value, the -2.7% to -5.2% differences for 134Cs were out of the standard uncertainty range of the reference values concluded that the differences for 134Cs is created due to the insufficient correction of TCS.

リンク情報
DOI
https://doi.org/10.2116/bunsekikagaku.67.213

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