オホーツク南西域および道東沖合における134Csおよび137Cs濃度の鉛直分布と海水循環への知見

輿石 大地; 真下 海成; 井上 睦夫; 谷内 由貴子; 中野渡 拓也; 長尾 誠也

doi:10.14862/geochemproc.71.0_67

Abstracts of Annual Meeting of the Geochemical Society of Japan

DOI https://doi.org/10.14862/geochemproc.71.0_67

Conference information

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

Vertical profiles of ¹³⁴Cs and ¹³⁷Cs concentration in the southwestern Okhotsk Sea and off the Doto and implications for current systems

*Koshiishi Daichi, Mashita Kaisei, Inoue Mutsuo, Taniuchi Yukiko, Nakanowatari Takuya, Nagao Seiya

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Keywords: Fukushima Daiichi Nuclear Power Plant accident, Radiocesium, Gamma ray measurement method, Current systems

CONFERENCE PROCEEDINGS FREE ACCESS

Pages 67-

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Abstract

The Fukushima Daiichi Nuclear Power Plant (FDNPP) accident caused the release of radiocesium (¹³⁴Cs and ¹³⁷Cs) into the marine environment. From the short half-life (2.06 years) and soluble characteristics, ¹³⁴Cs currently detected in seawater is derived from the FDNPP accident. ¹³⁴Cs has partially transported from the FDNPP accident to southwestern Okhotsk Sea and off the Doto via. counterclockwise current in the North Pacific Ocean, the Kamchatka - Oyashio Current. We examined vertical profiles of ¹³⁴Cs concentrations in these regions during 2020-2024 and discuss current systems in the Okhotsk Sea and out flow pattern to the Pacific Ocean side.

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