ICRP International

Conference on Recovery After Nuclear Accidents

Radiological Protection Lessons
from Fukushima and Beyond

December 1 - 18, 2020

S. Kumazawa

Updated: Dec 11, 2020

A New Approach for Better Understanding Environmental Impacts of a Nuclear Power Plant Accident

S. Kumazawa (Formerly, Japan Atomic Energy Research Institute, the predecessor of JAEA)

Variations in individual doses and long-term predictions of external dose rates due to deposited radionuclides to the affected residents after the accident at the nuclear power plant are of great concern to the members of the general public. This paper reports the results of analyses of the distribution of individual doses to residents and long-term predictions of dose rates in the air from the initial stage of the accident to several decades into the future, using available data from the Fukushima Daiichi Nuclear Power Plant accident (1F NPP). The hybrid scale (HS) model derived from occupational exposure data analysis is applied in an evolving manner in both tasks. The results show the applicability of the HS model as a new analysis method for general NPP accidents.


熊澤 蕃 (Formerly, Japan Atomic Energy Research Institute, the predecessor of JAEA)

原子力発電所での事故後の被災住民に対する個人線量の変動、及び沈着した放射性核種による外部被ばく線量率の長期予測は、一般市民にとって大きな関心事である。本書では、福島第一原子力発電所(1F NPP)の事故による入手可能なデータを用いて、事故の初期段階から将来の数十年後までの住民の個人線量率の分布と、空間線量率の長期予測の解析結果を報告する。職業被ばくデータの解析から求められたハイブリッドスケール(HS)モデルが両方の作業に逐次適用される。その結果は、一般的な原子力発電所事故の新たな解析手法としてのHSモデルの適用可能性を示す。