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Alpha spectroscopy and X-ray induced photocurrent studies of a SC CVD diamond detector fabricated with PLD contacts

Abdel-Rahman, Mohamed A.E., Lohstroh, Annika and Bryant, Peter (2019) Alpha spectroscopy and X-ray induced photocurrent studies of a SC CVD diamond detector fabricated with PLD contacts Radiation Physics and Chemistry, 164, 108357. pp. 1-6.

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Abstract

Using amorphous Carbon blended with Nickel (C/Ni) as electrodes for a polycrystalline diamond radiation detector (PC-C/Ni) was demonstrated previously as a novel technique to produce near-tissue equivalent X-ray dosimeters. In this project, we introduce the first characterisation of a (Chemical Vapour Deposited) single crystal diamond sandwich detector (with thickness of 0.4 mm) fabricated with this technique, labelled SC-C/Ni. To examine the performance of pulsed laser deposition (PLD) C/Ni as an electrode, alpha spectroscopy measurements and X-ray induced photocurrent measurements were studied as a function of the applied bias at room temperature and compared with those of the aforementioned PC-C/Ni.

The alpha particle spectroscopy measurement data allows us to differentiate between electron and hole contributions to the charge transport signal, whilst the X-ray data was investigated in terms of dose rate-linearity, sensitivity, signal to noise ratio (SNR) and photoconductive gain.

In the case of electron sensitive alpha induced signals, a Charge Collection Efficiency (CCE) higher than 90% has been observed at a bias of -40 V and 100% CCE at -300 V, with energy resolution of ∼3% for 5.48 MeV alpha particles. The sample showed very poor spectroscopy performance for hole sensitive signals up to 200 V.

The X-ray induced photocurrents show a high SNR of ∼7.3 × 10³, an approximately linear relationship between the photocurrent versus dose rate and a sensitivity of 4.87 μC/Gy.mm³. The photoconductive gain of SC-C/Ni is calculated to be ∼20, this gain calculation might be explained by trapping effects as investigated in the alpha spectroscopy measurements.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Abdel-Rahman, Mohamed A.E.
Lohstroh, AnnikaA.Lohstroh@surrey.ac.uk
Bryant, Peterp.a.bryant@surrey.ac.uk
Date : 10 June 2019
DOI : 10.1016/j.radphyschem.2019.108357
Copyright Disclaimer : © 2019 Published by Elsevier Ltd. 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 : CVD diamond based radiation detector; Alpha spectroscopy; Dosimetric properties; Carbon electrode; PLD
Depositing User : Clive Harris
Date Deposited : 17 Jun 2019 10:15
Last Modified : 11 Jun 2020 02:08
URI: http://epubs.surrey.ac.uk/id/eprint/852006

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