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<p>&#xa0;Proficiency testing was conducted annually from 2015 to 2023 in Fukushima prefecture. The testing targeted public institutes engaged in activity measurements and inspections employing high-purity germanium detectors. This study assesses whether these institutes maintained sufficient measurement capabilities over multiple years. The sample was brown rice grain containing <sup>134</sup>Cs and <sup>137</sup>Cs massic activities traceable to the national standard. The <i>D</i><sub><i>%</i></sub>, <i>z</i>′ score, and <i>En</i> values were used to evaluate performance. For both <sup>134</sup>Cs (2015–2020) and <sup>137</sup>Cs (2015–2023), most reported values were considered "Acceptable." Thus, the participants appeared to maintain sufficient measurement capabilities.</p>

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Long-term annual proficiency testing in Fukushima for quality control of activity measurement using gamma-ray spectrometry

  • 期刊论文

  • 发表日期：

    2026年1月2日

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  • Rio Furukawa,
  • Tsutomu Miura,
  • Mayumi Hachinohe,
  • Satoru Matsuzaki,
  • Motoharu Murakoshi,
  • Masahiro Yuki,
  • Shioka Hamamatsu,
  • Shinji Tokonami,
  • Hideki Harano

摘要

 Proficiency testing was conducted annually from 2015 to 2023 in Fukushima prefecture. The testing targeted public institutes engaged in activity measurements and inspections employing high-purity germanium detectors. This study assesses whether these institutes maintained sufficient measurement capabilities over multiple years. The sample was brown rice grain containing 134Cs and 137Cs massic activities traceable to the national standard. The D%, z′ score, and En values were used to evaluate performance. For both 134Cs (2015–2020) and 137Cs (2015–2023), most reported values were considered "Acceptable." Thus, the participants appeared to maintain sufficient measurement capabilities.