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論文

Effect of radioactive cesium-rich microparticles on radioactive cesium concentration and distribution coefficient in rivers flowing through the watersheds with different contaminated condition in Fukushima

辰野宇大*; 脇嘉理*; 角間海七渡*; 二瓶直登*; 高瀬つぎ子*; 和田敏裕*; 吉村和也; 中西貴宏; 大手信人*

Journal of Environmental Management, 329, p.116983_1 - 116983_13, 2023/03

https://doi.org/10.1016/j.jenvman.2022.116983

被引用回数：1 パーセンタイル：13.44(Environmental Sciences)

This study investigated the effect of radioactive cesium-rich microparticles (CsMPs) on the radiocesium (RCs) concentration and distribution coefficient (Kd) in two rivers, Takase River and Kami-Oguni River, flowing in the watersheds with different radioactive contaminated conditions in Fukushima Prefecture. Unlike RCs adsorbed on to the suspended solids (SS), there was no correlation between the RCs concentration derived from CsMPs and the SS concentration in both rivers. Inflow of CsMPs to the targeted rivers was contingent. CsMPs were detected only in some samples during rainfall. Furthermore, the proportion of RCs concentration derived from CsMPs in the average RCs concentrations per unit mass of SS in both rivers during rainfall were not large, which were 10% or less. As a results, CsMPs did not significantly increase particulate RCs concentration and had little effect on Kd in both river water flowing the watershed with different RCs contaminated condition.

論文

Cesium-rich microparticles runoff during rainfall; A Case study in the Takase River

辰野宇大*; 脇嘉理*; 角間海七渡*; 二瓶直登*; 和田敏裕*; 吉村和也; 中西貴宏; 大手信人*

Radiation Protection Dosimetry, 198(13-15), p.1052 - 1057, 2022/09

https://doi.org/10.1093/rpd/ncac052

被引用回数：1 パーセンタイル：29.26(Environmental Sciences)

Cesium-rich microparticles (CsMPs) with high cesium-137 ( $^{137}$ Cs) 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 $^{137}$ Cs concentration derived from CsMPs to $^{137}$ Cs concentration in the form of SS (particulate $^{137}$ Cs) in the water was 6% on average, which suggests that $^{137}$ Cs runoff in the form of CsMPs from the forest to the Takase River was not large.

論文

Development of dose evaluation method considering radionuclides migration on the surface of the site for confirmation of completion of decommissioning

三輪一爾; 行川正和*; 島田太郎; 武田聖司

MRS Advances (Internet), 7(7-8), p.165 - 169, 2022/03

https://doi.org/10.1557/s43580-022-00212-7

本研究では、地表流と土砂移動により生じる地表面における核種移行を土中の鉛直核種濃度と粒径に応じた核種濃度を考慮して評価する方法を作成した。作成した核種移行評価法により、水平方向に均一なCs-137の初期汚染分布を有する仮想的なサイトにおいて1年間の核種移行評価を実施した。その結果、Cs-137がサイト内の窪地に集中することにより初期汚染分布濃度と比較して20%程濃度が上昇した。また、地表面における核種移行により、初期汚染分布の総核種量の0.18%が海洋へ流出した。これらの結果から、廃止措置終了確認における被ばく線量評価において地表面における核種移行を考慮することで、サイト内における外部被ばく線量の上昇と海洋へ流出した核種による水産物摂取による内部被ばく線量の上昇の可能性が示唆された。