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Yamamoto, Yoichi; Kijima, Yuichi; Tomita, Yutaka
no journal, ,
Based on repeated DPRK's nuclear tests, the Japanese government contributed funds for the noble gas measurement project in February 2017 for the purpose of strengthening CTBTO's detection capability for nuclear tests. The CTBTO decided to conduct measurements in Hokkaido and Tohoku regions of Japan for the time being, and to enhance JAEA with experiences and performance of measurements in Japan as the responsible organization. In response to this, the JAEA has installed two mobile noble gas measurement systems at Horonobe, Hokkaido and JAEA Ohminato site in Mutsu, Aomori, and been carrying out the joint measurement project with the CTBTO. The current status of this project will be presented.
Yamamoto, Yoichi; Kijima, Yuichi
no journal, ,
Following the 6th DPRK nuclear test (DPRK-6) event on 3 September 2017, some Level C events of 
Xe were detected at the Takasaki radionuclide (RN) station and the Hawaii RN station in October. In order to investigate the relation between those Level C events and the DPRK-6 event, the Japanese NDC-2 carried out the ATM analysis for the Level C events. The estimation results of the possible source region using the ATM backtracking analysis show the DPRK test site is included in the possible source region. However, the results of the ATM forward tracking analysis from the DPRK test site disagree with the real measurement results at Takasaki and Hawaii RN stations. Some analysis results of ATM simulations by the NDC-2 and our conclusion for the Level C events at Takasaki and Hawaii are shown in the presentation.