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Hirota, Naoki*; Hokida, Takanori; Inoue, Yoji; Kumata, Masahiro; Kurosawa, Yoshiaki; Miyamoto, Yutaka; Nakahara, Yoshinori; Oda, Tetsuzo; Shinohara, Nobuo; Uchikoshi, Takako*; et al.
JAERI-Review 2003-021, 68 Pages, 2003/08
JAERI-Review-2003-021.pdf:9.73MB
This report describes research activities of the R & D Group for Non-Proliferation Technology related to the Comprehensive Nuclear-Test-Ban Treaty (CTBT) verification regime. The main subjects of this report are (1) an overview of the CTBT verification regime, (2) preparation of the National Data Center for radionuclide data, (3) construction and operation of the radionuclide monitoring stations at Takasaki and Okinawa and the certified rarionuclide laboratory at Tokai in Japan. We have participated in an intercomparison test internationally organized for the certified laboratories and the test results are given here. Scientific application of the CTBT-related technologies to environmental researches is also depicted.
Yamamoto, Yoichi; Kijima, Yuichi; Tomita, Yutaka
no journal, ,
This presentation summarizes JAEA's recent activities related to CTBT verification regime. To establish the global verification regime of CTBT for the nuclear tests, JAEA has been operating provisionally three facilities (two monitoring stations and one radionuclide laboratory) of the CTBT international monitoring system and a national data center for radionuclide monitoring. For the 6th nuclear test conducted by North Korea in September 2017, JAEA reported the analysis and evaluation results of data observed at the CTBT radionuclide monitoring stations to the national government etc. in a timely manner and thereby contributed to the evaluation by the national government based on the CTBT operation system in Japan. For the purpose of strengthening CTBTO's detection capability for nuclear tests, JAEA started new noble gas joint measurement project with CTBTO in Horonobe (Hokkaido) and Mutsu (Aomori) based on the Japanese government contribution in 2017.
Yamamoto, Yoichi; Furuno, Akiko; Kurihara, Toshiyuki; Tomita, Yutaka
no journal, ,
Radioxenon is a high-yield fission product which is an important tracer for a nuclear test, and is also emitted by civil nuclear facilities like isotope production facilities or nuclear power plants. The Ulaanbaatar radionuclide monitoring station (MNX45) in Mongolia has detected relatively high concentrations of Xe-133 exceeding 1 mBq/m
several times a year, despite the fact that there are no nuclear facilities in the vicinity that could be sources of emissions. To determine the source of emission, Atmospheric Transport Modelling (ATM) backtracking analyses for source estimation were carried out for five cases with consecutive detections of Xe-133 above 1 mBq/m since September 2023. For these cases, forward tracking analyses from the estimated sources of emissions were carried out to investigate the impact of detected Xe-133 on radionuclide monitoring stations located downwind from MNX45. We report on the analysis and results.
Kurihara, Toshiyuki; Sakurai, Shinichi*; Yamamoto, Yoichi; Furuno, Akiko; Tomita, Yutaka
no journal, ,
Our team at JAEA has been operated the Radionuclide station Takasaki (RN38) as a part of the International Monitoring System (IMS) for the Comprehensive Nuclear-Test-Ban Treaty (CTBT). RN38 has two monitoring system, one is for radioactive particles and the other is for noble gases. The noble gas monitoring system, JPX38 (SAUNA-II), was installed at RN38 in December 2006, after North Korea's first nuclear test. JPX38 was upgraded to the latest SAUNA system (SAUNA-III) with improved performance including temporal resolution, in May 2023. Our team is working with CTBTO, and the developer of SAUNA system have been cooperating to conduct the process for revalidation of JPX38 from June 2023 to the present. We report on the installation and trial run of SAUNA-III.