加速器質量分析法を用いた宇宙線生成核種36Clの降下フラックス変動評価

落合 悠太; 笹 公和; 戸崎 裕貴; 高橋 努; 松村 万寿美; 高野 健太; 太田 祐貴; 末木 啓介

doi:10.14862/geochemproc.65.0_232

Abstracts of Annual Meeting of the Geochemical Society of Japan

DOI https://doi.org/10.14862/geochemproc.65.0_232

Conference information

Host: Abstracts of Annual Meeting of the Geochemical Society of Japan

Evaluation of temporal variations in the cosmogenic ³⁶Cl flux with accelerator mass spectrometry

*Yuta Ochiai, Kimikazu Sasa, Yuki Tosaki, Tsutomu Takahashi, Masumi Matsumura, Kenta Takano, Yuki Ota, Keisuke Sueki

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Keywords: AMS, ³⁶Cl, cosmic ray, rainwater, solor activity

CONFERENCE PROCEEDINGS FREE ACCESS

Pages 232-

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Abstract

³⁶Cl is a cosmogenic nuclide, which is produced by the reactions of Ar with cosmic rays. Therefore, the deposited ³⁶Cl on the ground is expected to be correlated with the cosmic-ray intensity. In this study, we measured ³⁶Cl in rainwater with accelerator mass spectrometry (AMS) and evaluated the ³⁶Cl flux monthly from 2010 to 2014. The results confirmed that the ³⁶Cl flux was correlated with sunspot number (r = -0.4) on the assumption that ³⁶Cl fell down to the ground for two years. Besides, in 2011, a large amount of ³⁶Cl was observed, which was considered to be released from the Fukushima Daiichi Nuclear Power Plant accident.

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