A Consideration of Level C events at Takasaki (JPX38) and Hawaii (USX79) after the 6th DPRK nuclear test

Yamamoto, Yoichi ; Kijima, Yuichi 

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.