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Characterization of Ge-doped optical fibres for MV radiotherapy dosimetry

Noor, NM, Hussein, M, Bradley, DA, Nisbet, A and Kadni, T (2014) Characterization of Ge-doped optical fibres for MV radiotherapy dosimetry Radiation Physics and Chemistry, 98. pp. 33-41.

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Abstract

Ge-doped optical fibres offer promising thermoluminescence (TL) properties together with small physical size and modest cost. Their use as dosimeters for postal radiotherapy dose audits of megavoltage photon beams has been investigated. Key dosimetric characteristics including reproducibility, linearity, dose rate, temperature and angular dependence have been established. A methodology of measuring absorbed dose under reference conditions was developed. The Ge-doped optical fibres offer linearity between TL yield and dose, with a reproducibility of better than 5%, following repeated measurements (n=5) for doses from 5cGy to 1000cGy. The fibres also offer dose rate, angular and temperature independence, while an energy-dependent response of 7% was found over the energy range 6MV to 15MV (TPR of 0.660, 0.723 and 0.774 for 6, 10 and 15MV respectively). The audit methodology has been developed with an expanded uncertainty of 4.22% at 95% confidence interval for the photon beams studied. © 2013 Elsevier Ltd.

Item Type: Article
Authors :
NameEmailORCID
Noor, NMUNSPECIFIEDUNSPECIFIED
Hussein, MUNSPECIFIEDUNSPECIFIED
Bradley, DAUNSPECIFIEDUNSPECIFIED
Nisbet, AUNSPECIFIEDUNSPECIFIED
Kadni, TUNSPECIFIEDUNSPECIFIED
Date : May 2014
Identification Number : 10.1016/j.radphyschem.2013.12.017
Depositing User : Symplectic Elements
Date Deposited : 28 Mar 2017 13:11
Last Modified : 31 Oct 2017 16:56
URI: http://epubs.surrey.ac.uk/id/eprint/806053

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