Host: Abstracts of Annual Meeting of the Geochemical Society of Japan
Name : Abstracts of Annual Meeting of the Geochemical Society of Japan
Number : 71
Date : September 18, 2024 - September 20, 2024
Pages 65-
Large amount of 137Cs was released to marine environments by the Fukushima Dai-ichi Nuclear Power Plant accident. In this study, we investigated the surface seawater circulation in the Bering Sea and Arctic Oceans using 137Cs. Seawater samples were collected during Oshoro Maru and Mirai expeditions in 2022-2023. The concentration of 137Cs was measured using low background gamma-spectrometry via. AMP precipitation. The 137Cs concentration at the surface in the Bering Sea showed a decrease after 2022, following the increase from 2017. Significant variations in 137Cs concentration were also observed in the same latitude region in the Bering Sea, reflecting the complex seawater circulation. Comparing with 228Ra concentration, we clarify the circulation processes of 137Cs (and other dissolved components).
