APPLICATION OF THE NUCLIDE IDENTIFICATION SYSTEM SHAMAN IN MONITORINGTHE COMPREHENSIVE TEST BAN TREATY

SHAMAN is an expert system for qualitative and quantitative radionucli de identification in gamma spectrometry. SHAMAN requires as input the calibrations, peak search, and fitting results from reliable spectral analysis software, such as SAMPO. SHAMAN uses a comprehensive referenc e library with 2600 radionuclides and 80 000 gamma-lines, as well as a rule base consisting of sixty inference rules. identification results are presented both via an interactive graphical interface and in the form of configurable text reports. An organization has been establishe d for monitoring the recent Comprehensive Test Ban Treaty. For radionu clide monitoring, 80 stations will be set up around the world. Air-fil ter gamma-spectra will be collected from these stations on a daily bas is and they will need to be reliably analyzed with minimum turnaround time. SHAMAN is currently being evaluated within the prototype monitor ing system as an automated radionuclide identifier, in parallel with e xisting radionuclide identification software. In air-filter monitoring , very low concentrations of radionuclides are measured from bulky sou rces in dose geometry and with long counting time. In this case true c oincidence summing and self-absorption become important factors. SHAMA N is able to take into account these complicated phenomena, and the re sults it produces have been found to be very reliable and accurate.