Plutonium isotopes derived from Nagasaki atomic bomb in the sediment of Nishiyama reservoir at Nagasaki, Japan

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• 作者：Y. Saito-Kokubu ; F. Esaka ; K. Yasuda ; M. Magara ; Y. Miyamoto ; S. Sakurai ; S. Usuda ; H. Yamazaki ; S. Yoshikawa ; S. Nagaoka
• 关键词：Plutonium ; Nagasaki ; Atomic bomb ; Isotopic ratio ; Sediment
• 刊名：Applied Radiation and Isotopes
• 出版年：2007
• 期刊代码：6_09698043
• 类别：ce
• 出版时间：April 2007
• 卷：65
• 期：4
• 页码：465-468
• 文件大小：512 K

摘要

The source of plutonium in sediments deposited at Nishiyama reservoir at Nagasaki was characterized by their ²⁴⁰Pu/²³⁹Pu 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 ²⁴⁰Pu/²³⁹Pu 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.