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Extensive study on vertical migration of $$^{137}$$Cs in undisturbed soil after the Fukushima Dai-ichi Nuclear Power Plant accident

吉村 和也 ; 越智 康太郎  ; 松田 規宏  ; 三上 智  ; 眞田 幸尚   ; 斎藤 公明 

Yoshimura, Kazuya; Ochi, Kotaro; Matsuda, Norihiro; Mikami, Satoshi; Sanada, Yukihisa; Saito, Kimiaki

The depth distribution of $$^{137}$$Cs is important not only for radiation protection, but also for radioecology and geoscience. This study aims to grasp the depth distribution of $$^{137}$$Cs in undisturbed areas over a wide area affected by the Fukushima Dai-ichi Nuclear Power Plant accident and its change with time. The relaxation mass depth (g cm$$^{-2}$$), a parameter representing the depth distribution, increase with time from 2011 to 2024, indicating the penetration of $$^{137}$$Cs under the ground. The increase was well represented by a power function (Root Mean Squared Error = 0.71 g cm$$^{-2}$$).

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