The ICS-4000 Radionuclide Identifier is a hand held gamma-ray spectrometer that combines a multichannel analyzer with a high resolution Cadmium Telluride (CdTe) detector. The ICS-4000 is programmed to automatically analyze gamma ray spectra and report detected radionuclides and dose rates. Users can select from preprogrammed isotope libraries or can define custom libraries from a list of over 160 radionuclides.