Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 70(1): 1-18 (2021)


環境放射線モニタリングにおける線量当量率及び空気中放射性物質濃度の同時決定法に関する検討Study on Method for Simultaneous Determination of Ambient Dose Equivalent Rates and Activity Concentration in Air for Environmental Radiation Monitoring

1日本原子力研究開発機構原子力科学研究所放射線管理部Department of Radiation Protection, Nuclear Science Research Institute, Japan Atomic Energy Agency

2量子科学技術研究開発機構高度被ばく医療センター計測・線量評価部Center for Advanced Radiation Emergency Medicine, National Institutes for Quantum and Radiological Science and Technology

3ドイツ連邦物理工学研究所Physikalisch-Technische Bundesanstalt, Germany

4ヴルツブルグ大学放射線腫瘍学部Department of Radiation Oncology, University of Würzburg, Germany

受付日:2020年5月14日Received: May 14, 2020
受理日:2020年8月14日Accepted: August 14, 2020
発行日:2021年1月15日Published: January 15, 2021


For proper environmental radiation monitoring, a method to simultaneously determine ambient dose equivalent rate and radioactivity concentration in the air by using a newly developed scintillation spectrometer, namely a CeBr3 spectrometer was investigated. The performance of the proposed method, including energy dependence, angular dependence and the linearity of the spectrometer (i.e. the dose rate dependence of its response), was verified by a series of measurements, conducted according to the procedure of inter-comparison of detectors used for early warning network performed by the European Radiation Dosimetry Group (EURADOS). Measurement results show that the proposed method is suitable for environmental radiation monitoring purposes. After thorough tests, the investigation on obtaining activity concentration in air from the pulse height spectrum of γ-ray was demonstrated in the laboratory by using a point-like sealed 133Ba source to simulate an artificial increase of ambient dose equivalent rate due to a radioactive cloud containing 131I and 133Xe. The photon fluence rate was obtained from the pulse height spectrum by using the unfolding method, and the activity concentration in air for radionuclides of interest could be estimated from the obtained photon fluence rate by applying the conversion coefficient evaluated via a Monte Carlo calculation.

Key words: CeBr3; ambient dose equivalent-H*(10); emergency radiation monitoring; radiation protection; Monte Carlo calculation

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