Abstract: A system for detecting and identifying radioactive materials on board a carrier includes a stationary structure (10) extending lengthwise of the carrier (14) adjacent to at least one of its opposite boards (15). The system also has a plurality of passive radiation detection devices (16) arranged lengthwise of the stationary structure (10). The passive radiation detection devices (16) define a plurality of zones (A through K) extending lengthwise of the stationary structure (10) and each of the passive radiation detection devices (16) is connected to a communication system (a through e) for sending the data containing detection findings obtained within a specific zone within which an increased radioactivity level has been detected by at least one of the passive radiation detection devices a control center (60). The system also has a material identifier (18) capable of identifying radio nuclides and isotopes which emit radiation within the zone within which said increased radioactivity level has been detected.

Abstract: The present invention provides a system for detecting explosives, drugs or radioactive or fissile material aboard waterborne vessels. The system includes a linear accelerator mounted on a floating platform such as a ship that directs a photon beam at a target vessel. If the target vessel contains explosives, drugs or radioactive or fissile material the photon beam will induce characteristic neutron radiation from these substances that is picked up by neutron radiation detectors mounted on the floating platform. Neutron radiation induced by the accelerator is detectable even through shielding such as lead. A floatation stabilization system supports the operation of the accelerator and detectors. A data storage system documents radiation data and corresponding identification data for the target vessel and can access a database containing the target vessels cargo manifest. Video cameras may be used to identify the target vessel.