Abstract
Concentrations of 238Pu, 239, 240Pu, 241Pu, 241Am and 137Cs were determined on the soils collected from the Nishiyama area in Nagasaki City where the heaviest fallout from Nagasaki Atomic Bomb had been detected. And, the contribution of the plutonium derived from Nagasaki Atomic Bomb to the measured total 239, 240Pu in each soil was estimated to be as much as 95 ?? 97% from the activity ratios of 241Pu/239, 240Pu and 241Am/239, 240Pu.
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