Radionuclide Monitoring for the Comprehensive Nuclear Test Ban Treaty

Global monitoring for relevant radionuclides in the atmosphere serves as part of the International Monitoring System (IMS) to verify compliance with the Comprehensive Nuclear Test Ban Treaty (CTBT). The radionuclide network consists of eighty stations supplemented by sixteen radionuclide laboratories. All stations have a particulate sampler and forty were selected for noble gas samplers with the option for later expansion to all sites. This paper describes radionuclide signatures, the employed measurement technologies, and achieved detection sensitivity, as well as data analysis and reporting by the International Data Centre (IDC). Finally, data fusion with seismoacoustic events and the application of atmospheric transport modelling are discussed.