Radionuclide laboratories supporting the network of radionuclide stations in verification of the Comprehensive Nuclear-Test-Ban Treaty

The radionuclide monitoring network enables continuous world-wide observati on of airborne radionuclides in the verification regime of the Comprehensiv e Nuclear Test-Ban-Treaty (CTBT). The radionuclide technology - analysis of aerosol samples and xenon at 80 sites hosting radionuclide monitoring stat ions - contributes to the International Monitoring System (IMS). Sixteen ra dionuclide laboratories will support the radionuclide monitoring network. T heir main function is additional analysis of aerosol samples. Samples categ orised as Level 5 that contain multiple anthropogenic radionuclides, at lea st one of which is a fission or an activation product, will always be sent out for laboratory, analysis. A number of samples will be re-analysed at th e radionuclide laboratories irrespective of category. This serves the purpo se of quality control for the results produced by the stations.