Distribution of dissolved and particulate radiocesium concentrations along rivers and the relations between radiocesium concentration and deposition after the nuclear power plant accident in Fukushima

作者：Tsuji Hideki; Yasutaka Tetsuo^*; Kawabe Yoshishige; Onishi Takeo; Komai Takeshi

来源：Water Research, 2014, 60: 15-27.

DOI：10.1016/j.watres.2014.04.024

• Dissolved radiocesium
• Particulate radiocesium
• Deposition
• River water
• Fukushirria
• Regression analysis

This study involved measurement of concentrations of dissolved and particulate radiocesium (Cs-134 and Cs-137) in river water, and determination of the quantitative relations between the amount of deposited Cs-137 and Cs-137 concentrations in river waters after the Fukushima Daiichi nuclear power plant accident. First, the current concentrations of dissolved and particulate Cs-134. Cs-137 were determined in a river watershed from 20 sampling locations in four contaminated rivers (Abukuma, Kuchibuto, Shakado, and Ota). %26lt;br%26gt;Distribution characteristics of different Cs-137 forms varied with rivers. Moreover, a higher dissolved Cs-137 concentration was observed at the sampling location where the Cs-137 deposition occurred much more heavily. In contrast, particulate Cs-137 concentration along the river was quite irregular, because fluctuations in suspended solids concentrations occur easily from disturbance and heavy precipitation. A similar tendency with dissolved Cs-137 distribution was observed for the Cs-137 concentration per unit weight of suspended solids. %26lt;br%26gt;Regression analysis between deposited Cs-137 and dissolved/particulate Cs-137 concentrations was performed for the four rivers. The results showed a strong correlation between deposited Cs-137 and dissolved Cs-137, and a relatively weak correlation between deposited Cs-137 and particulate Cs-137 concentration for each river. However, if the particulate Cs-137 concentration was converted to Cs-137 concentration per unit weight of suspended solid, the values showed a strong correlation with deposited Cs-137.

• 出版日期2014-9-1