Rapiscan Systems’ neutron scanning technologies include Thermal Neutron Analysis (TNA®), Fast Neutron Analysis (FNA) and Pulsed Fast Neutron Analysis (PFNA™). In these technologies, the neutrons create gamma-ray signals when they interact with the elemental ingredients of the inspected object. The gamma-ray energies are unique to the elements in the inspected object. If the gamma-ray signatures match those in a threat database, the system automatically alarms indicating the possible presence of the threat.