International intercomparison of emergency radiation monitoring techniques via coordinated field exercise

協調型現場演習による国際的な緊急放射線監視技術の比較評価

越智 康太郎  ; 森下 祐樹   ; 中間 茂雄; 眞田 幸尚   ; 他10名*

Ochi, Kotaro; Morishita, Yuki; Nakama, Shigeo; Sanada, Yukihisa; 10 of others*

To evaluate the emergency radiation monitoring capabilities of various countries, a coordinated field exercise involving Japan, France, the Republic of Korea, and Canada was conducted near the Fukushima Daiichi Nuclear Power Sation. Under standardized conditions, manborne, carborne, and airborne surveys were performed using different detector systems to assess ambient dose equivalent rates (air dose rates). JAEA employed CsI(Tl) detectors for manborne and carborne surveys, and LaBr(Ce) scintillation detectors for airborne surveys using an unmanned helicopter. Despite differences in equipment and analysis methods, all teams observed consistent trends in air dose rate distributions. These results demonstrate the feasibility of producing internationally comparable dose rate maps and emphasize key factors such as shielding and energy response in dose rate assessments.