量子科学技術研究開発機構量子医学・医療部門福島再生支援研究部Department of Radioecology and Fukushima Project, Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Sciences and Technology ◇ 263–8555 千葉県千葉市稲毛区穴川4–9–1 ◇ 4–9–1 Anagawa, Inage-ku, Chiba 263–8555, Japan
東京電力福島第一原子力発電所の事故後に得られた放射性セシウムの環境移行データの解析の結果，事故以前のグローバルフォールアウト137Cs研究で得た環境移行パラメータ値に年々近づいている傾向がみられた。現在は，一定の割合の放射性セシウムが環境中を循環する「平衡状態」になりつつあるといえる。今後は，長期的な被ばく線量評価のための数学モデルに用いる適切なパラメータ値を整備して，確度と精度の高い将来予測をすることが期待される。
Analyses of environmental transfer data of radiocaesium released from the Fukushima Dai-ichi Nuclear Power Plant accident had been carried out in terrestrial, freshwater and marine environments. The results showed that the obtained environmental transfer parameter values were getting closer every year to those determined for the global fallout 137Cs studies before the Fukushima nuclear accident. Thus it was implied that the fate of radiocaesium in the environments had almost reached to equilibrium conditions now; that is, a certain percentage of total radiocaesium circulates in the environment like before the accident. Further field observation to collate suitable environmental transfer parameter values of radiocaesium are still necessary, and then by supplying those data for mathematical models for long-term dose assessment, it is expected to have more reliable and precise radiation dose assessment results in the future.
Key words: environmental transfer parameter; equilibrium condition; mathematical model; Fukushima Dai-ichi Nuclear Power Plant Accident; long-term fate
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