Institute of Environmental Radioactivity, Fukushima University, 1 Kanayagawa, Fukushima, 960-1296, Japan.
Graduate School of Informatics, Kyoto University, Yoshida Hommachi, Sakyo-ku, Kyoto, 606-8501, Japan.
Radiat Prot Dosimetry. 2022 Sep 9;198(13-15):1052-1057. doi: 10.1093/rpd/ncac052.
Cesium-rich microparticles (CsMPs) with high cesium-137 (137Cs) concentrations were released and deposited in surface soil after the Fukushima Daiichi Nuclear Power Plant accident. Radioactive materials on the soil surface layer enter rivers owing to soil erosion during rainfall. In this study, we investigated CsMPs runoff through the river via soil erosion during rainfall in the Takase River watershed in Namie Town, Fukushima Prefecture, Japan. CsMPs were rarely detected in suspended solids (SS) in water samples collected during four rainfalls between February and July 2021. Furthermore, the proportion of 137Cs concentration derived from CsMPs to 137Cs concentration in the form of SS (particulate 137Cs) in the water was ~6% on average, which suggests that 137Cs runoff in the form of CsMPs from the forest to the Takase River was not large.
富铯微粒（CsMPs）在福岛第一核电站事故后释放并沉积在地表土壤中，其铯-137（137Cs）浓度很高。由于降雨时的土壤侵蚀，土壤表层的放射性物质会进入河流。在这项研究中，我们调查了日本福岛县浪江町高濑河流域降雨时通过土壤侵蚀导致的 CsMPs 径流水体流失情况。在 2021 年 2 月至 7 月的四次降雨期间采集的水样中，悬浮物（SS）中很少检测到 CsMPs。此外，水中 SS 形式的 137Cs 浓度（颗粒态 137Cs）中源自 CsMPs 的 137Cs 浓度比例平均约为 6%，这表明从森林到高濑河的 CsMPs 形式的 137Cs 径流量不大。
