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Characterisation of a plastic scintillation detector to be used in a multicentre stereotactic radiosurgery dosimetry audit

Dimitriadis, Alexis, Silvestre Patallob, I, Billas, I, Duane, S, Nisbet, Andrew and Clark, CH (2017) Characterisation of a plastic scintillation detector to be used in a multicentre stereotactic radiosurgery dosimetry audit Radiation Physics and Chemistry, 140. pp. 373-378.

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Abstract

Scintillation detectors are considered highly suitable for dosimetric measurement of small fields in radiotherapy due to their near-tissue equivalence and their small size. A commercially available scintillation detector, the Exradin W1 (Standard Imaging, Middleton, USA), has been previously characterised by two independent studies (Beierholm et al., 2014; Carrasco et al., 2015a ; Carrasco et al., 2015b) but the results from these publications differed in some aspects (e.g. energy dependence, long term stability). The respective authors highlighted the need for more studies to be published (Beierholm et al., 2015; Carrasco et al., 2015a ; Carrasco et al., 2015b). In this work, the Exradin W1 was characterised in terms of dose response, dependence on dose rate, energy, temperature and angle of irradiation, and long-term stability. The observed dose linearity, short-term repeatability and temperature dependence were in good agreement with previously published data. Appropriate corrections should therefore be applied, where possible, in order to achieve measurements with low-uncertainty. The angular dependence was characterised along both the symmetrical and polar axis of the detector for the first time in this work and a dose variation of up to 1% was observed. The response of the detector was observed to decrease at a rate of approximately 1.6% kGy−1 for the first 5 kGy delivered, and then stabilised to 0.2% kGy−1 in the subsequent 20 kGy. The main goal of this work was to assess the suitability of the Exradin W1 for use in dose verification measurements for stereotactic radiosurgery. The results obtained confirm that the detector is suitable for use in such situations. The detector is now utilised in a multi-centre stereotactic radiosurgery dosimetric audit, with the application of appropriate correction factors.

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Dimitriadis, Alexisa.dimitriadis@surrey.ac.ukUNSPECIFIED
Silvestre Patallob, IUNSPECIFIEDUNSPECIFIED
Billas, IUNSPECIFIEDUNSPECIFIED
Duane, SUNSPECIFIEDUNSPECIFIED
Nisbet, AndrewA.Nisbet@surrey.ac.ukUNSPECIFIED
Clark, CHUNSPECIFIEDUNSPECIFIED
Date : 14 February 2017
Identification Number : 10.1016/j.radphyschem.2017.02.023
Copyright Disclaimer : © 2017. 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 : Scintillation detector; Dosimetry; Radiotherapy; Radiosurgery; Audit
Depositing User : Symplectic Elements
Date Deposited : 02 May 2017 09:04
Last Modified : 15 Sep 2017 11:57
URI: http://epubs.surrey.ac.uk/id/eprint/814069

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