Ultra-trace analysis of the nuclides related to nuclear nonproliferation

Shinohara, Nobuo 

In this paper, the research activities of JAEA related to the Comprehensive Nuclear-Test-Ban Treaty (CTBT) verification regime are first reported. The main subjects of this paper are (1) an overview of the CTBT verification regime, (2) construction and operation of the radionuclide monitoring stations at Okinawa (RN37) and Takasaki (RN38) and Tokai radionuclide laboratory (RL11), and (3) preparation of the National Data Center (NDC) for environmental radionuclide data. Next topics are related to the technologies for safeguards at Clean Laboratory for Environmental Analysis and Research (CLEAR): (4) current status of environmental sample analysis, (5) "bulk analysis" and (6) "particle analysis" of swipe samples, and (7) analysis of hot cell samples for ultra-trace nuclear materials. The ultra-sensitive radioactivity measurement in the field of CTBT and the ultra-trace analysis of nuclear materials are significant for international contribution to the nuclear non-proliferation.