Monte Carlo calculation of CR-39 efficiency for fast neutron detection using a combination of MCNP and SRIM codes, and comparison with experimental results

摘要

The elastic scattering of light nuclei, especially hydrogen, is widely used for detection of fast neutrons. Fast neutrons have a few interactions in solid State nuclear track detectors (SSNTDs), such as CR-39. It has been shown that to increase the efficiency of detector, a radiator layer, e.g. polyethylene may be used. In this work, the optimum thickness of the radiator layer has been determined. Some different thicknesses of aluminium layers have been used as discriminators for which the efficiency of detector to Am-Be neutron source has been calculated. A program FTRAC has been developed for the calculation of the detection efficiency. This software determines the specifications of recoil protons (using PTRAC card of MCNP code) and also the kinematics of interactions. Transport of recoil protons has been carried out using SRIM Write Carlo code. A good agreement have been shown between measurement and simulation results. (c) 2007 Elsevier Ltd. All rights reserved.