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In a sediment core of Nishiyama reservoir at Nagasaki city, depth profiles of 240 Pu/ 239 Pu isotopic ratio, 239+240 Pu and 137 Cs activities were determined. Sediments containing plutonium and 137 Cs, which were deposited immediately after a detonation of Nagasaki atomic bomb, were identified in the core. Observed below the sediments were macroscopic charcoals,...
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