Point-spread-function computation in fast neutron radiography

In fast neutron radiography, scintillator plates are often employed as converters of fast neutron radiation. In this paper, the simulation of interaction between BC400 scintillator plates and vertical-incidence D-T neutrons is presented, and the point spread function of scintillator plates is calculated, which exhibits a stable profile during the thickness increasing of plates from 2 mm to 100 mm. The calculation also indicates that, for a certain spatial resolution, there is not an improvement in the contrast of neutron images when the thickness of plates increases.