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Neutron Detection Performance of Silicon Carbide and Diamond Detectors with Incomplete Charge Collection Properties

Hodgson, M, Lohstroh, A, Sellin, P and Thomas, D (2016) Neutron Detection Performance of Silicon Carbide and Diamond Detectors with Incomplete Charge Collection Properties Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment.

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Abstract

The benefits of neutron detection and spectroscopy with carbon based, wide band gap, semiconductor detectors have previously been discussed within the literature. However, at the time of writing there are still limitations with these detectors related to availability, cost, size and perceived quality. This study demonstrates that lower quality materials—indicated by lower charge collection efficiency (CCE), poor resolution and polarisation effect—available at wafer scale and lower cost, can fulfil requirements for fast neutron detection and spectroscopy for fluxes over several orders of magnitude, where only coarse energy discrimination is required. In this study, a single crystal diamond detector (D-SC, with 100% CCE), a polycrystalline diamond (D-PC, with ≈4% CCE) and semi-insulating silicon carbide (SiC-SI, with ≈35% CCE) have been compared for alpha and fast neutron performance. All detectors demonstrated alpha induced polarisation effects in the form of a change of both energy peak position and count rate with irradiation time. Despite these operational issues the ability to detect fast neutrons and distinguish neutron energies was observed. This performance was demonstrated over a wide dynamic range (500–40,000 neutrons/s), with neutron induced polarisation being demonstrated in D-PC and SiC-SI at high fluxes.

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
AuthorsEmailORCID
Hodgson, MUNSPECIFIEDUNSPECIFIED
Lohstroh, AUNSPECIFIEDUNSPECIFIED
Sellin, PUNSPECIFIEDUNSPECIFIED
Thomas, DUNSPECIFIEDUNSPECIFIED
Date : 13 November 2016
Identification Number : https://doi.org/10.1016/j.nima.2016.11.006
Copyright Disclaimer : Crown Copyright © 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords : Semi-insulating silicon carbide, Single crystal diamond, Polycrystalline diamond, Neutron detection, Polarisation, Semiconductor radiation detectors
Depositing User : Symplectic Elements
Date Deposited : 22 Nov 2016 12:16
Last Modified : 22 Nov 2016 12:16
URI: http://epubs.surrey.ac.uk/id/eprint/812930

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