The Mirion FASTSCAN whole body counter is designed to quickly and accurately monitor people for internal contamination of radionuclides with energies between 300 keV to 1.8 MeV. The FASTSCAN system uses large area sodium iodide detectors and the Mirion Apex-InVivo and Genie software to achieve low minimum detectable activities with count times as fast as one minute. It is intended for use in power plants and other facilities where the possible contamination spectra are well known and uncomplicated.