Longitudinal response uniformity of a rectangular-shaped plastic scintillator when exposed to mono-energetic gamma-rays

Abstract

The longitudinal response uniformity of the rectangular-shaped plastic scintillators used in a thermal neutron imaging system proposed by Ghal-Eh and Green in 2016 is vital for its precise measurements in quality assurance studies of boron neutron capture therapy (BNCT). The MCNPX-PHOTRACK hybrid code has been used to model the response of rectangular plastic scintillator of partially painted surface in order to reduce as much as possible the longitudinal non-uniformity which usually exist in large and/or long scintillators. The results show that the optimum uniformity corresponds to fully-polished surface which coincides with FLUKA light transport simulations.