Abstract
Fast Neutron Resonance Radiography (NRR) has been suggested to detect explosives and drugs in passenger suitcases. In the NRR method, the 2-D elemental mapping of hydrogen, carbon, nitrogen, oxygen, and the sum of other elements are calculated using fast neutron radiographic images taken at different neutron energies chosen to cover the resonance features of one or more elements. A radiographic image provides the 2-D mapping of the sum of elemental contents (weighted by the attenuation coefficients) and images taken at different neutron energies form a set of linear equations which can be solved for the mapping of individual elemental content. Explosives and drugs can be identified by their characteristic elemental composition. Different energy (2-6 MeV) neutrons can be obtained at different angles from a DD neutron source. A fixed-energy RFQ with a thick target can be used as the neutron source in NRR. Simulation results are presented in the paper.
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