The FlexSpec Fixed-Site system is a state-of-the-art, fixed-site radiation detection system which provides high-sensitivity gamma and/or neutron detection for screening vehicles, people, and packages at key checkpoints or ports of entry.  The quantity and configuration of detectors, as well as mounting approach, can be easily customized on a FlexSpec Fixed-Site system to accommodate installation at various sites using new or existing support structures.  The system provides rapid and reliable isotope identification and alarm categorization, using proven analysis software and an easy to use software interface, as well as secure, remote operation through authorized, web-enabled smartphones or tablets. Optional supervisory software allows multiple fixed-site systems to be monitored or controlled from a single supervisory computer connected over a network.