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An experiment for performance evaluation of a beam-shaping assembly to generate therapeutic neutrons has been carried out for accelerator-based boron neutron capture therapy (BNCT). Neutron beams are produced by using 7Li(p,n)7Be reaction, which has a high neutron yield for low energy neutrons comparing with other reactions. The manufactured assembly is composed of two moderators, AlF3 and A1, and a surrounding graphite reflector in order to focus the generated neutrons from the Li-target on the epithermal energy range with high intensity and quality. The target neutrons from 7Li(p,n)7Be reaction and epithermal neutrons generated from the assembly were measured by He-3 detector. It was convinced from the experiment that the beam-shaping assembly, designed in this study, can shape the source neutron beam into the effective neutron beam for BNCT of which epithermal neutrons occupy the 87.4 %. The experimental result was verified through the use of Monte Carlo simulation using MCNPX code. Appropriate agreement was found between the calculated and measured results in a wide energy range from 0 to 800 keV.
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Kim et al. (2008) studied this question.
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