Detail of Grant Awarded Academic Researches
Behavior analysis of radiocesium in sediment sampled at Tamagawa River Watershed for 30 years later
(at that time)
|Senior Assistant Professor Department of Applied Chemistry School of Science and Technology Meiji University|
Monitoring of radiocesium (137Cs: T1/2 = 30 y) derived the Fukushima Daiichi Nuclear Power Plant is crucial for investigation of activity distribution and variation tracing of radioactivity radioactive substances in low dose area. In this study, radiocesium in sediments sampled at 50 points in Tamagawa River watershed, concluding main stream and tributary stream, were measured for behavior analysis of radiocesium at low dose areas. In addition, we developed an analytical method combing a pre-concentration method with a sequential extraction method for the precise monitoring of radiocesium in sediment. Monitoring result suggested that the activity concentrations of radiocesium in sediment sampled at middle tributary stream and lower main stream were high compared to upper and middle main stream. Radiocesium in middle main stream point “Shukugawara” was periodically observed. In rainy weather, the activity concentrations of radiocesium in sediment were approximately 2-3 times higher than the condition of fine and cloudy. It is suggested that the influx of radiocesium to main stream from tributary stream, namely, rain wash was occurred.
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