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Characterization of Ge-doped optical fibres for MV radiotherapy dosimetry


Mohd Noor, Noramaliza and Hussein, Mohammad and Kadni, Taiman and Bradley, David A. and Nisbet, Andrew (2014) Characterization of Ge-doped optical fibres for MV radiotherapy dosimetry. Radiation Physics and Chemistry, 98. pp. 33-41. ISSN 0969-806X; ESSN: 1879-0895


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 5 cGy to 1000 cGy. The fibres also offer dose rate, angular and temperature independence, while an energy-dependent response of 7% was found over the energy range 6 MV to 15 MV (TPR20,10 of 0.660, 0.723 and 0.774 for 6, 10 and 15 MV respectively). The audit methodology has been developed with an expanded uncertainty of 4.22% at 95% confidence interval for the photon beams studied.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Medicine and Health Science
DOI Number: https://doi.org/10.1016/j.radphyschem.2013.12.017
Publisher: Elsevier
Keywords: Ge-doped optical fibres; Dosimetry intercomparison; Megavoltage photon
Depositing User: Nabilah Mustapa
Date Deposited: 05 Aug 2015 03:21
Last Modified: 06 Oct 2015 03:38
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.radphyschem.2013.12.017
URI: http://psasir.upm.edu.my/id/eprint/36756
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