Active neutron interrogation has been computationally investigated for examination of large sealed capsules containing unknown radioactive materials. The detection of fission interactions is crucial to determining if a potentially dangerous object contains fissile material. The technique focuses on delayed neutrons resulting from in-beam irradiation of fissile materials, and could be further enhanced using a detector which detects prompt neutron emission while omitting signals due to irradiation neutrons. This paper reports on the initial Geant4 simulation work undertaken to simulate prompt neutron detectionusing neutron time-correlation methods, and demonstrates the ability to distinguish a fission neutron source from an (a,n) neutron source.
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