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  • Title: Plutonium isotopes derived from Nagasaki atomic bomb in the sediment of Nishiyama reservoir at Nagasaki, Japan.
    Author: Saito-Kokubu Y, Esaka F, Yasuda K, Magara M, Miyamoto Y, Sakurai S, Usuda S, Yamazaki H, Yoshikawa S, Nagaoka S.
    Journal: Appl Radiat Isot; 2007 Apr; 65(4):465-8. PubMed ID: 17150366.
    Abstract:
    The source of plutonium in sediments deposited at Nishiyama reservoir at Nagasaki was characterized by their (240)Pu/(239)Pu atom ratio. The average ratio was approximately 0.03, except in two layers. The main source of the plutonium was the Nagasaki atomic bomb. The plutonium continues to flow into the reservoir even now. The (240)Pu/(239)Pu atom ratios in two layers were higher than the average, which showed that plutonium in these layers were made of those of nuclear tests added to those of the atomic bomb.
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