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Full Spectrum Analysis Isotope Identification (FSA Isotope ID) is a gamma-ray spectrum analysis software application that identifies radionuclides and radioactive isotopes. It is suitable for use in real-time collection systems, such as handheld or vehicle-mounted radioactive isotope identifiers (RIDs) used by emergency first responders, law enforcement, and hazardous materials specialists, as well as in the post-processing of recorded data files.