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Nishiyama Reservoir: Lead Sources,Inventory, and the Influence of the Nagasaki Atomic Bomb
Authors:Kenshi Katahira  Hiroshi Moriwaki  Miho Ishitake  Yoko Saito-Kokubu  Hideo Yamazaki  Shusaku Yoshikawa
Institution:1. Osaka City Institute of Public Health &2. Environmental Sciences , Osaka , Japan
Abstract:Sediment core samples were obtained from Nishiyama Reservoir, 3 km east of the hypocenter of the Nagasaki atomic bomb, to evaluate both sources and inventories of lead delivery to the sediments. Using microwave digestions and ICP-MS analytical techniques, elevated concentrations of isotopically unique lead were identified in the 1945 sediment horizon. These results illustrate that the Nagasaki bomb attack can be linked with unique lead loading to the sediments in the region of the hypocenter. There is a possibility that the roll-up of in-situ lead accounted for a majority of the increase in lead flux delivered to reservoir sediments during the atomic bomb attack.
Keywords:Sediment core  Pb  isotope ratios  Nagasaki atomic bomb  microwave extraction method
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