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Source term estimation of $$^{131}$$I and $$^{137}$$Cs discharged from the Fukushima Daiichi Nuclear Power Plant into the atmosphere

福島第一原子力発電所から大気放出された$$^{131}$$I及び$$^{137}$$Csの放出源推定

永井 晴康 ; 堅田 元喜; 寺田 宏明  ; 茅野 政道

Nagai, Haruyasu; Katata, Genki; Terada, Hiroaki; Chino, Masamichi

原子力機構は、福島第一原子力発電所から大気放出されたヨウ素とセシウムの放出源推定を行ってきた。はじめに、環境モニタリングデータとSPEEDI及びWSPEEDIの大気拡散計算を用いて暫定的な放出源推定を行った。次に、局地域詳細拡散解析により、プラント北西部の高線量地帯形成過程の解明を行った。この解析と新規公開データを用いた解析により、2011年3月12日から15日までの事故初期段階における$$^{131}$$I及び$$^{137}$$Csの放出率と放出総量の再評価を行った。さらに、東日本域の拡散計算結果と放射性核種降下量測定データとの比較により、放出源推定結果の妥当性を確認した。

JAEA has been trying to estimate the source term of iodine and cesium discharged from the Fukushima Daiichi Nuclear Power Plant to the atmosphere. As the first step, the source term was preliminary estimated by coupling environmental monitoring data with atmospheric dispersion simulations by SPEEDI and WSPEEDI. Then, detailed analysis on the local atmospheric dispersion has been carried out, and revealed the formation process of high dose rate zone around north-west direction from the plant. With this analysis and further analysis for the early phase of the accident, the release rates and total amounts of $$^{131}$$I and $$^{137}$$Cs discharged into the atmosphere were re-estimated for the period from 12 to 15 March, 2011. Finally, the validity of revised source term was also examined by comparing daily and monthly surface deposition (fallout) over land in eastern Japan between measurements and outputs from the regional scale atmospheric dispersion simulation.

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