Production of a pulseable fission-like neutron flux using a monoenergetic 14 MeV neutron generator and a depleted uranium reflector
Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment 588,3 (2008) 414-423;
The design and performance of a pulseable neutron source utilizing a D-T neutron generator and a depleted uranium reflector are presented. Approximately half the generator's 14 MeV neutron flux is used to produce a fission-like neutron spectrum similar to Cf-252. For every 14 MeV neutron entering the reflector, more than one fission-like neutron is reflected back across the surface of the reflector. Because 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, such as from hydrogen, nitrogen, and chlorine. Experiments were performed, which compare well to Monte Carlo simulations, showing that the uranium reflector enhances capture signals by up to a factor of 15 compared to the absence of a reflector. (C) 2008 Elsevier B.V. All rights reserved.
D-T neutron generator;; depleted uranium reflector;; pulseable neutron;; source;; fission-like neutron spectrum;; gamma-ray spectroscopy;; neutron;; elemental analysis;; thermal neutron analysis;; pulsed fast neutron;; analysis;; vehicle borne improvised explosives device;; Instruments & Instrumentation;; Nuclear Science & Technology;; Physics, ;; Particles & Fields;; Spectroscopy
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