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Optimizing Converter Layer and Active Volume Thickness for Gallium Nitride Neutron Detectors

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Published
Publication date12/08/2021
Host publication2020 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)
Place of PublicationBoston, MA, USA
PublisherIEEE
Number of pages6
ISBN (Electronic)9781728176932
ISBN (Print)9781728176949
<mark>Original language</mark>English

Abstract

Gallium nitride (GaN) is a direct energy gap semiconductor material with a wide bandgap, high thermal conductivity, high chemical stability, and strong resistance to radiation. It has broad prospects in the application of optoelectronics, high temperature and high power devices, and particle detectors. In this work, an early-stage GaN radiation-hardened neutron detector is described. Monte Carlo simulations using Geant4 10.6 are used to investigate and optimize the converter layers and active volume for the detector and the suggested thickness needed to achieve the highest detection efficiency is given. Further, the gamma rejection ability for GaN has been studied, and the spatial distribution of the partial reaction type of gamma rays with GaN are shown for the first time. This work will aid the design and fabrication of radiation-resistant GaN neutron detectors and will benefit reactor monitoring, high-energy physics experiments, and nuclear fusion research.