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

[HCG22-10] Inventory distribution of radionuclides in unaltered soil samples

*Hiroshi Yashima¹, Yasuhito Igarashi¹, Takashi Saito², Naofumi Akata³, Sumi Yokoyama⁴, Satoru Endo⁵, Yayoi Inomata⁶, Shinji Sugihara⁷, WG Meteorology and Soil (1.Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2.SHOKEI GAKUIN UNIVERSITY, 3.Hirosaki University, 4.Nagasaki University, 5.Hiroshima University, 6.Kanazawa University, 7.Oita University)

Keywords:Inventory of radionuclides, alteration of soil samples

Soil samples are being collected to obtain validation data for the "black rain" deposition in the study of the estimated "black rain" rainfall area that occurred after the atomic bombings of Hiroshima and Nagasaki in 1945. In order to confirm whether the validation data obtained are from the 1945 deposition, it is necessary to confirm that the soil samples have not been altered and that the stratigraphy has been preserved.
We reported on the evaluation of alteration of soil samples using radioactivity distribution profiles in soil samples and fallout inventories. Even at points where the inventory amount fell outside the judgment criteria, the profiles were neatly distributed and there were also points that appeared to be unaltered, so the inventory amount conditions were reviewed. In this presentation, we report on the reviewed conditions of inventory.