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Lateral and vertical distribution of radiocesium, grain size and organic matter content off the Niida River estuary, Fukushima Prefecture were investigated in mid-October 2013. The dissolved 137Cs activities in surface water samples collected at NR1, NR3 and NR5 stations, which are located within 5.0-10 km from the Niida River estuary, were higher than those of other stations outside the 10 km zone. In bottom water samples, the activities had a small variation with distance from the estuary. The activities in surface water at most stations were higher than those in bottom water. There were a negative correlation between dissolved 137Cs activities and salinity in surface water. These results suggested that the dissolved radiocesium in seawater have been transported to north-south direction in surface layer along the continent. High fractions for coarse to very fine sand particles in the sediments were observed at NR1 and NR2 stations, which are located in a northern direction from the Niida River estuary. At NR4, there were high fractions for granule and very coarse sand particles. The grain size fraction became granular with increasing core depth. The 137Cs activities in sediments at NR1 were higher compared to those of other stations. It seems that lateral and vertical distributions of radiocesium in sediments were affected by the particle composition. It is necessary to get more station data because the vertical profiles of 137Cs activity were not especially similar to those of grain size and contents in sediments. Thus, it is necessary to continue the monitoring in the estuary area in order to elucidate the effects of the grain size and contents on cesium in the sediments found off the Fukushima Prefecture coast.
雑誌名
Fukushima Prefecture. Proceedings of the International Symposium on Radiological Issues for Fukushima’s Revitalized Future
ページ
66 - 69
発行年
2016-01
出版者
Kyoto University Research Reactor Institute KUR Research Program for Scientific Basis of Nuclear Safety
The distributions of radiocesium in seawaters and sediments collected off the Niida River estuary, Fukushima Prefecture
