，飯本 武志Hiromi Koike, Takeshi Iimoto東京大学The University of Tokyo
NORMの取扱いの実例と放射線施設等での放射性物質の管理方法を比較し，NORMの合理的な取扱方法の枠組みを考察し提案した。作業区域の考え方として，厳格な管理方針を取る管理区域ではなく，規定を設けない監視区域の考え方を取り入れ，合理的な適用例を示した。作業者とNORM自体の取扱いの枠組みについては，作業者は職業人の特徴を持つが，防護の観点では放射線に関する知識がない等の理由から，公衆として扱うべきとし，管理目標として1～5 mSv/yを提言した。
This study aims to propose a reasonable radiation management framework for naturally occurring radioactive materials (NORM) by comparing NORM handling practice with the management of radioactive materials in radiation facilities. For the concept of the work area, we adopted the idea of Supervised area instead of Controlled area with strict control and showed an example of its reasonable application. Persons who occasionally engage in tasks related to NORM might be categorized as public due to their lack of expertise in radiation. However, considering their occupational characteristics, we propose an acceptable safety dose criterion of 1–5 mSv/y.
Key words: naturally occurring radioactive material (NORM); radiation protection; exposure category; planned exposure situation; existing exposure situation; supervised area
© Japan Radioisotope Association 2025. This is an open access article distributed under the Creative Commons Attribution 4.0 International (CC BY 4.0) License (https://creativecommons.org/licenses/by/4.0/)© Japan Radioisotope Association 2025. This is an open access article distributed under the Creative Commons Attribution 4.0 International (CC BY 4.0) License (https://creativecommons.org/licenses/by/4.0/)
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