日本地球惑星科学連合2022年大会

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[E] 口頭発表

セッション記号 M (領域外・複数領域) » M-AG 応用地球科学

[M-AG37] CTBT IMS Technologies for Detecting Nuclear Explosion and Their Applications to Earth Science

2022年5月23日(月) 15:30 〜 17:00 102 (幕張メッセ国際会議場)

コンビーナ:Ozel Nurcan Meral(Comprehensive Nuclear-Test-Ban Treaty Organization)、コンビーナ:松本 浩幸(国立研究開発法人海洋研究開発機構)、コンビーナ:Metz Dirk(Japan Agency for Marine-Earth Science and Technology)、コンビーナ:直井 洋介(国立研究開発法人日本原子力研究開発機構)、Chairperson:Nurcan Meral Ozel(Comprehensive Nuclear-Test-Ban Treaty Organization)、直井 洋介(国立研究開発法人日本原子力研究開発機構)、Dirk Metz(Comprehensive Nuclear-Test-Ban Treaty Organization)

15:45 〜 16:00

[MAG37-02] Source term estimation of Xe-135 observed at the noble gas monitoring station in Japan regarding CTBT

*古野 朗子1、山本 洋一1、冨田 豊1、栗原 寿幸1 (1.日本原子力研究開発機構)

キーワード：CTBT、Xe-135、大気拡散シミュレーション、放出源推定

This study aims at the source term estimation of Xe-135 observed at the Takasaki Radionuclide Station of CTBT International Monitoring System and at two temporary stations, Horonobe, Hokkaido, and Mutsu, Aomori of the Joint Noble Gas Measurement Project with CTBT, from the viewpoint of atmospheric dispersion. Radioactive xenon has been irregularly and frequently observed at these stations, thus it is very important to expose the source of the release areas in order to ensure the detection of nuclear tests. The most frequently observed isotope of radioactive xenon monitored by CTBT is Xe-133; nuclear facilities in Europe may be possible source as well as in East Asia depending on the meteorological conditions due to its relatively long half-life (5.25 days), making it difficult to specific of the source. On the other hand, Xe-135 has a short half-life of about 9 hours, and the possible release areas are limited to a relatively small area. In this presentation, we will focus on the Xe-135 detection events in the past four years and discuss the possible sources that could affect Japan.