Cesium-137 wash-off associated with soil erosion on various land uses in Fukushima

Yoshimura, Kazuya  ; Wakiyama, Yoshifumi*; Onda, Yuichi*; Takase, Tsugiko* 

This study presents Cs-137 wash-off observations on various land uses including decontaminated lands in Fukushima. We established rectangle soil erosion plots on six landscape; uncultivated farmland (UFL), cultivated farmland (CFL), grassland (GL), forest (F), uncultivated and cultivated farmlands on a decontaminated land (D-UFL and D-CFL). The D-UFL and DCFL were established after the decontamination of erosion plots. Mean Cs-137 concentrations on decontaminated lands decreased down to approx. 10 to 40 % of values observed before decontamination. No significant difference in amount of eroded sediment was found between contaminated and decontaminated lands, suggesting that decontamination works decrease total Cs-137 wash-off.