Vertical and horizontal distributions of caesium-137 on paved surface affected by Fukushima Dai-ichi Nuclear Power Plant accident

福島第一原子力発電所事故によるCs-137の舗装面における鉛直, 水平分布

吉村 和也  ; 渡辺 貴善 ; 操上 広志  

Yoshimura, Kazuya; Watanabe, Takayoshi; Kurikami, Hiroshi

To obtain the important information and parameter for the measurement of Cs-137 activity per unit area on paved ground, this study evaluated their vertical and horizontal distributions. This study showed that Cs-137 was retained in extremely surface layer with mass depth less than 0.5 cm. This study also demonstrated the horizontal variations of Cs-137 activity and the relation of the variation with grid size.