Japan Geoscience Union Meeting 2024

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[J] Oral

H (Human Geosciences ) » H-CG Complex & General

[H-CG21] Monitoring the Comprehensive Nuclear-Test-Ban Treaty: Status, operations, and scientific application

Mon. May 27, 2024 3:30 PM - 4:45 PM 301A (International Conference Hall, Makuhari Messe)

convener:Dirk Metz(Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization), Akiko FURUNO(Japan Atomic Energy Agency), Hiroyuki Matsumoto(Japan Agency for Marine-Earth Science and Technology), Takayuki Otsu(Japan Weather Association), Chairperson:Dirk Metz(Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization), Hiroyuki Matsumoto(Japan Agency for Marine-Earth Science and Technology), Takayuki Otsu(Japan Weather Association), Akiko FURUNO(Japan Atomic Energy Agency)

4:30 PM - 4:45 PM

[HCG21-05] Source estimation analysis of radioxenon detected at Mongolian radionuclide monitoring station and diffusion analysis from the emission source

*Yoichi Yamamoto1, Akiko FURUNO1, Toshiyuki Kurihara1, Yutaka Tomita1 (1.Japan Atomic Energy Agency)

Keywords:CTBT, radioxenon, IMS, ATM

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/m3 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/m3 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.