Deuterized Radiator for Deiection of High-Energy Neutrons with Plastic Nuclear Track Detector

Abstract

In order to develop a passive-type personal dosimeter based on plastic nuclear track detector (PNTD) for high-energy neutrons, a selection of radiator material and its thickness is one of key-points as well as utilization of high-sensitive type of PNTD. The radiator effect has been preliminarily estimated by numerical calculations using the angular differential cross section and characteristic data for charged particle detection with PNTD. A hydrogen compound, commonly used as a radiator, was expected to be not so effective for energetic neutrons higher than 10 MeV, so that a deuterized material was checked as one of the alternatives. The performance of these materials has been investigated through experiments quasi-monoenergetic neutron field, and the measured results were compared with those obtained numerical1y. It was also recognized that the dependence of relative sensitivity on the radiator thickness was considerable affected by a contamination of lower energy component in the neutron field.