[H-CG22] Monitoring the Comprehensive Nuclear-Test-Ban Treaty: Status, operations, and scientific application

[HCG22-P05] Investigation of Reservoir Sediments in the Fallout Area of the Hiroshima Atomic Bomb's "Black Rain"

*Jun Inoue¹, Yasuhito Igarashi², Hiroshi Yashima², Satoshi Fukutani², Tomonori Adachi², WG Meteorology and Soil (1.Graduate School of Science, Osaka Metropolitan University, 2.Institute for Integrated Radiation and Nuclear Science, Kyoto University)

Keywords:The "Black Rain" caused by A-bomb explosion, Radioactive fallout,, Pond sediments

We collected core sediment samples from a reservoir in the Takeda-yama Ikoi-no-Mori area of Hiroshima City, which lies within the fallout area of the Hiroshima Atomic Bomb's "Black Rain" in 1945. We analyzed the vertical distribution of ¹³⁷Cs concentrations and, in addition, charcoal fragments in the samples, which were likely produced by house fires caused by the atomic bombing. In this presentation, we will present the results of these analyses and evaluate whether such sediment records can be effectively used to assess the "black rain" fallout zone.