Yoshimura Kazuya, Onda Yuichi, Sakaguchi Aya, Yamamoto Masayoshi, Matsuura Yuki
Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.
Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.
J Environ Radioact. 2015 Jan;139:370-378. doi: 10.1016/j.jenvrad.2014.08.021. Epub 2014 Sep 18.
An extensive investigation of particulate radiocaesium in suspended solids and dissolved radiocaesium in river water was undertaken at 30 sites in Fukushima and Miyagi Prefectures in December 2012, and their relationships with catchment inventory and the solid/liquid distribution coefficient (Kd) were evaluated. Rivers located in the coastal region on the north side of the Fukushima Dai-ichi Nuclear Power Plant exhibited relatively higher particulate radiocaesium concentrations. Significant correlations were found between concentrations of particulate/dissolved radiocaesium and average catchment inventories, indicating that the concentrations of particulate/dissolved radiocaesium could be approximated from the catchment inventory. Particulate radiocaesium concentration was significantly correlated with dissolved radiocaesium concentration (with the exception of concentrations measured in estuaries), and the geometric mean Kd was calculated as 3.6 × 10(5) with a 95% confidence interval of 2.6-5.1 × 10(5).
2012年12月，在福岛县和宫城县的30个地点，对河水中悬浮固体中的颗粒态放射性铯以及溶解态放射性铯展开了广泛调查，并评估了它们与集水区存量以及固液分配系数（Kd）之间的关系。位于福岛第一核电站北侧沿海地区的河流，颗粒态放射性铯浓度相对较高。颗粒态/溶解态放射性铯浓度与集水区平均存量之间存在显著相关性，这表明颗粒态/溶解态放射性铯浓度可根据集水区存量进行估算。颗粒态放射性铯浓度与溶解态放射性铯浓度显著相关（河口处测量的浓度除外），几何平均Kd计算值为3.6×10⁵，95%置信区间为2.6 - 5.1×10⁵。
