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<p>Following the Japan Fukushima incident, radioactive foodstuff Certified Reference Materials (CRMs) were urgently required. The Brown Rice, Dried Fish Meal, and Fish Bone Ash CRMS containing Cs-134, Cs-137, K-40 and Sr-90 were manufactured and certified by 16 experienced Japanese radiochemistry laboratories. Following the certification of massic activities of the selected radionuclides in their natural matrix CRMs, a group of 11 radiometrology National Metrology Institutes (NMI), environmental, and health and safety laboratories were invited to verify the certified values. The process of comparing the CRM certified values to those from the International Comparison Study (ICS) required special statistical tools. The questions posed and the results are as follows: 1) Do the participating international laboratories have consistent location, i.e. central tendency, among laboratories with no significant bias? 2) Do the participating international laboratories have consistent variation, i.e., no significant difference in uncertainty determinations. 3) Are the Japanese CRM certified values consistent with those from the ICS?</p>

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Statistical analysis of Japanese Fukushima radioactive foodstuff CRM verification by international comparison study

  • 期刊论文

  • 发表日期：

    2026年3月5日

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  • N. Alan Heckert,
  • James J. Sr. Filliben,
  • Kenneth G. W. Inn,
  • Chushiro Yonezawa,
  • Shoji Hirai,
  • Yoshitaka Minai

摘要

Following the Japan Fukushima incident, radioactive foodstuff Certified Reference Materials (CRMs) were urgently required. The Brown Rice, Dried Fish Meal, and Fish Bone Ash CRMS containing Cs-134, Cs-137, K-40 and Sr-90 were manufactured and certified by 16 experienced Japanese radiochemistry laboratories. Following the certification of massic activities of the selected radionuclides in their natural matrix CRMs, a group of 11 radiometrology National Metrology Institutes (NMI), environmental, and health and safety laboratories were invited to verify the certified values. The process of comparing the CRM certified values to those from the International Comparison Study (ICS) required special statistical tools. The questions posed and the results are as follows: 1) Do the participating international laboratories have consistent location, i.e. central tendency, among laboratories with no significant bias? 2) Do the participating international laboratories have consistent variation, i.e., no significant difference in uncertainty determinations. 3) Are the Japanese CRM certified values consistent with those from the ICS?