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Investigating the components of signals produced by the Pockels CCD imaging technique in CdZnTe

Parsons, S., Langley, A., Shenton-Taylor, C. and Lohstroh, A, (2018) Investigating the components of signals produced by the Pockels CCD imaging technique in CdZnTe IEEE Transactions on Nuclear Science, 65 (9). pp. 2633-2639.

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Abstract

Several groups have demonstrated the potential of the Pockels effect in Cadmium Zinc Telluride (CZT) as a means to detect ionizing radiation. Migrating charge carriers are believed to generate the signal detected via the Pockels effect due to the distortions they create within the electric field, however trapped space charge beneath the cathode has been regularly observed which suggests field changes away from the charge generation area. Consequently the Pockels signal amplitude contains a charge integrated, i.e. dose element. In this work, the effects of electric field collapse at the location of charge carrier generation are demonstrated. This opens the potential to apply the technique for imaging dose rate distributions. Charged coupled device (CCD) images representing the changes in electric field within the crystal were taken and the response to illumination from a collimated 1550 nm 4.5 mW IR laser and irradiation from 150 kVp X-rays measured. The data demonstrates that the signal acquired is a combination of both the local change in the electric field at the location where the carriers are being released/generated and an element caused by carriers becoming trapped, leading to electric field enhancement due to space charge near the cathode, and field reduction towards the anode.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Parsons, S.s.a.parsons@surrey.ac.uk
Langley, A.
Shenton-Taylor, C.c.shenton-taylor@surrey.ac.uk
Lohstroh, A,A.Lohstroh@surrey.ac.uk
Date : 24 July 2018
Funders : Science and Technology Facilities Council (STFC)
DOI : 10.1109/TNS.2018.2859245
Copyright Disclaimer : © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Related URLs :
Depositing User : Clive Harris
Date Deposited : 13 Aug 2018 23:25
Last Modified : 11 Dec 2018 11:24
URI: http://epubs.surrey.ac.uk/id/eprint/848914

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