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Comparison of Ge-doped TL optical fibres and glass beads with ion chamber and Gafchromic film for small field photon dosimetry

Alalawi, Amani, Jafari, Shakardokht, Najem, M, Clark, K, Nisbet, A, Abolaban, F, Hugtenburg, R, Hussein, M, Alzimami, Khalid, Spyrou, N and Bradley, D (2013) Comparison of Ge-doped TL optical fibres and glass beads with ion chamber and Gafchromic film for small field photon dosimetry In: 1st International Conference on Dosimetry and its Applications (ICDA-1), 23–28 June 2013, Prague, Czech Republic.

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Abstract

Small field (≤ 4 × 4 cm) photon radiotherapy treatments include intensity-modulated radiation therapy (IMRT)and stereotactic body radiation therapy (SBRT). These require small, high spatial resolution dosimeters of adequate dynamic range. In this study, field sizes of 1 cm × 1 cm, 2 cm × 2 cm, 3 cm × 3 cm, 4 cm × 4 cm, and 10 cm × 10 cm have been investigated using commercially available silica-based fibres and glass beads (GB) as TL dosimeters and a Varian linear accelerator operating at 6, 10 and 15 MV. Ge-doped SiO2 fibres have previously been shown by this group to offer a viable system for use as dosimeters. The fibres and GB, offer good spatial resolution (∼120 μm and 2 mm respectively), large dynamic dose range (with linearity from tens of mGy up to well in excess of many tens of Gy), a non-hygroscopic nature and low cost. The main aim of this present work is to investigate the use of Ge-doped optical fibres and GBs as thermoluminescence dosimeters in small photon fields for different photon beam energies, comparing the measurements against Gafchromic films, hospital commissioning data obtained from small ionisation chambers and photon diodes and Monte Carlo simulations with FLUKA and BEAMnrc.

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences
Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Alalawi, Amani
Jafari, Shakardokhtshakardokht.jafari@surrey.ac.uk
Najem, M
Clark, K
Nisbet, AA.Nisbet@surrey.ac.uk
Abolaban, F
Hugtenburg, R
Hussein, M
Alzimami, Khalid
Spyrou, NN.Spyrou@surrey.ac.uk
Bradley, DD.A.Bradley@surrey.ac.uk
Date : June 2013
Copyright Disclaimer : Copyright 2013 the authors
Depositing User : Diane Maxfield
Date Deposited : 04 Jul 2018 14:05
Last Modified : 04 Jul 2018 14:05
URI: http://epubs.surrey.ac.uk/id/eprint/848651

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