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Dosimetric characteristics of fabricated silica fibre for postal radiotherapy dose audits

Ahmad Fadzil, Muhammad Safwan and Ramli, N. N. H. and Jusoh, M. A. and Kadni, Taiman and Bradley, David A. and Ung, Ngie Min and Hashim, Suhairul and Mohd Noor, Noramaliza (2014) Dosimetric characteristics of fabricated silica fibre for postal radiotherapy dose audits. In: 9th National Seminar on Medical Physics (NSMP 2014), 5 Apr. 2014, Marriott Hotel, Putrajaya, Malaysia. pp. 1-7.

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Present investigation aims to establish the dosimetric characteristics of a novel fabricated flat fibre TLD system for postal radiotherapy dose audits. Various thermoluminescence (TL) properties have been investigated for five sizes of 6 mol% Ge-doped optical fibres. Key dosimetric characteristics including reproducibility, linearity, fading and energy dependence have been established. Irradiations were carried out using a linear accelerator (linac) and a Cobalt-60 machine. For doses from 0.5 Gy up to 10 Gy, Ge-doped flat fibres exhibit linearity between TL yield and dose, reproducible to better than 8% standard deviation (SD) following repeat measurements (n = 3). For photons generated at potentials from 1.25 MeV to 10 MV an energy-dependent response is noted, with a coefficient of variation (CV) of less than 40% over the range of energies investigated. For 6.0 mm length flat fibres 100 μm thick × 350 pm wide, the TL fading loss following 30 days of storage at room temperature was < 8%. The Ge-doped flat fibre system represents a viable basis for use in postal radiotherapy dose audits, corrections being made for the various factors influencing the TL yield.

Item Type:Conference or Workshop Item (Paper)
Keyword:Dosimetric; Postal radiotherapy dose audits
Faculty or Institute:Faculty of Medicine and Health Science
Publisher:IOP Publishing
DOI Number:10.1088/1742-6596/546/1/012010
ID Code:43062
Deposited By: Nabilah Mustapa
Deposited On:17 May 2016 17:15
Last Modified:17 May 2016 17:15

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