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Feasibility study of silica bead thermoluminescence detectors (TLDs) in an external radiotherapy dosimetry audit programme

Jafari, Shakardokht, Distefano, G, Lee, J, Gouldstone, C, Mayles, H, Jupp, T, Nisbet, Andrew and Clark, C (2017) Feasibility study of silica bead thermoluminescence detectors (TLDs) in an external radiotherapy dosimetry audit programme Radiation Physics and Chemistry, 141. pp. 251-256.

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Feasibility study of silica bead thermoluminescence detectors (TLDs) in an external radiotherapy dosimetry audit programme.pdf - Accepted version Manuscript
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Abstract

Purpose: Investigating the feasibility of using low-cost commercially available silica beads as novel thermo-luminescence dosimeters (TLD) for postal dosimetry audit. Methods: A mail-based dosimetry audit was designed to assess the positional and dosimetric accuracy of SABR-lung treatment delivery using alanine and EBT3-film, placed in a CIRS-anthropomorphic thorax phantom. In conjunction, the silica beads were dosimetrically characterised as TLDs and cross-calibrated against the alanine. A CT-scan of the phantom with pre-delineated volumes was sent to 20 RT centres and used to create a SABR plan using local current protocols and techniques. The silica beads were held in an insert, designed to match that of the alanine holder and ionisation chamber to give the same measurement length. The doses determined by the silica beads were compared to those measured by alanine, the local ionisation chamber, film and the TPS calculation. Results: The mean percentage difference between the doses measured by the silica beads and the calculated doses by the TPS was found to be 0.7% and differed by 0.6%, 0.7%, and 1.3% from the alanine, film and local ionisation chamber measurements respectively. Conclusions: Results obtained with the silica beads agree well with those obtained from conventional detectors including alanine, film and ionisation chambers. This together with the waterproof and inert characteristics and minimal dose fading associated with silica bead TLDs confirm their potential as a postal dosimetry audit tool in both water and plastic phantoms which could withstand challenges of temperature and humidity variation, as well as postal service delays.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Jafari, Shakardokhtshakardokht.jafari@surrey.ac.ukUNSPECIFIED
Distefano, GUNSPECIFIEDUNSPECIFIED
Lee, JUNSPECIFIEDUNSPECIFIED
Gouldstone, CUNSPECIFIEDUNSPECIFIED
Mayles, HUNSPECIFIEDUNSPECIFIED
Jupp, TUNSPECIFIEDUNSPECIFIED
Nisbet, AndrewA.Nisbet@surrey.ac.ukUNSPECIFIED
Clark, CUNSPECIFIEDUNSPECIFIED
Date : 29 July 2017
Identification Number : 10.1016/j.radphyschem.2017.07.021
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 : Dosimetry auditRadiotherapySABRThermoluminescent detectors
Depositing User : Melanie Hughes
Date Deposited : 16 Aug 2017 08:08
Last Modified : 23 Aug 2017 08:55
URI: http://epubs.surrey.ac.uk/id/eprint/841938

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