A Neutron Based Vehicle Borne Improvised Explosive Device Detection System

The design and performance of a pulseable neutron source utilizing a D-T neutron generator and a depleted uranium reflector are presented for use in a scanning system of improvised explosive devices. Approximately half the generator's 14 MeV neutron flux is used to produce a fission- like neutron spectrum similar to 252Cf. For every 14 MeV neutron entering the reflector, more than one fission-like neutron is reflected back across the surface of the reflector. Because the delayed neutron production is more than two orders of magnitude below the prompt neutron production, the source takes full advantage of the generator's pulsed mode capability. Applications include all elemental characterization systems using neutron-induced gamma-ray spectroscopy. The source simultaneously emits 14 MeV neutrons optimal to excite fast neutron-induced gamma-ray signals, such as from carbon and oxygen, and fission-like neutrons optimal to induce neutron capture gamma-ray signals.

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