Inventories of 239+240Pu, 137Cs, and excess 210Pb in sediment cores from brackish Lake Obuchi, Rokkasho Village, Japan

Ueda, S.; Ohtsuka, Y.; Kondo, K.
August 2004
Journal of Radioanalytical & Nuclear Chemistry;Aug2004, Vol. 261 Issue 2, p277
Academic Journal
The aim of this study was to measure the distribution and inventories of 239+240Pu, 137Cs, and excess 210Pb (210Pbexcess) in sediment core samples from brackish Lake Obuchi, which is in the vicinity of nuclear fuel facilities in Rokkasho Village, Japan. The inventory of the 239+240Pu activity in the sediment samples from the estuary of a freshwater river, the central point of the lake, and the deepest point in the lake were 0.18, 0.29, and 0.24 kBq.m-2, respectively. The inventories of 137Cs and 210Pbexcess in sediments were 0.83-1.2 kBq.m-2 and 25-30 kBq.m-2, respectively. The mean 239+240Pu/137Cs and 210Pbexcess/137Cs activity ratios were 0.23 and 28, respectively. The 239+240Pu/137Cs activity ratios were approximately 13-24 times the ratio expected from global fallout. The inventories of 239+240Pu and 210Pb in sediments were higher than the inventory expected from atmospheric fallout, but the 137Cs inventory was significantly lower than expected.


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