Japan Geoscience Union Meeting 2025

Presentation information

[J] Oral

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

[H-CG22] Monitoring the Comprehensive Nuclear-Test-Ban Treaty: Status, operations, and scientific application

Tue. May 27, 2025 9:00 AM - 10:30 AM 104 (International Conference Hall, Makuhari Messe)

convener:Dirk Metz(CTBTO), Satoru Endo(Graduate School of Advanced Science and Engineering,Hiroshima University), Hiroyuki Matsumoto(Japan Agency for Marine-Earth Science and Technology), Takayuki Otsu(Japan Weather Association), Chairperson:Akiko FURUNO(Japan Atomic Energy Agency), Hiroyuki Matsumoto(Japan Agency for Marine-Earth Science and Technology)

9:15 AM - 9:30 AM

[HCG22-02] ISCN's Contribution to International Verification Regime for CTBT

*Masato Hori1, Yutaka Tomita1, Akiko Furuno1 (1. Japan Atomic Energy Agency)

Keywords:a world without nuclear weapon, International Verification Regime for CTBT, radionuclide monitoring, nuclear test

The Integrated Support Center for Nuclear Nonproliferation and Nuclear Security (ISCN) was established within the Japan Atomic Energy Agency (JAEA) based on Japan's National Statement at the 2010 Nuclear Security Summit. The mission of the ISCN is to contribute to a world without nuclear weapons and nuclear terrorism, and to contribute to the welfare and prosperity of human society. ISCN is comprehensively engaged in research and development, support for human resource development, support for the Comprehensive Test Ban Treaty (CTBT) international verification regime, policy research, and activities to promote understanding, all of which are essential for realizing a world free of nuclear weapons and nuclear terrorism, taking advantage of its strengths as a nuclear energy research institute.
In support of the CTBT international verification regime, ISCN operates the radionuclide monitoring stations in Okinawa and Takasaki, as well as the certified radionuclide laboratory in Tokai and the national data center for nuclear test monitoring, as stipulated by the treaty. In order to enhance nuclear test detection capabilities, transportable noble gas monitoring systems have been installed in Mutsu City, Aomori Prefecture and Horonobe Town, Hokkaido for measurement as a joint observation project to investigate the background behavior of radioactive noble gases together with the CTBT Organization.
So far, Xe emissions from North Korea's third nuclear test in 2013 have been detected, and back-tracking has been conducted to identify the source of the emissions.
In addition, during the accident at the Fukushima Daiichi Nuclear Power Plant in 2011, Xe emissions were monitored and analyzed for three months to return to pre-accident levels, showing that the CTBT's noble gas monitoring system has the potential to be applied not only to verify nuclear tests but also to monitor nuclear power plants operation.