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Radiotherapy dosimetry and the thermoluminescence characteristics of Ge-doped fibres of differing germanium dopant concentration and outer diameter


Citation

Mohd Noor, Noramaliza and Ahmad Fadzil, Muhammad Safwan and Ung, Ngie Min and Maah, Mohd Jamil and Mahdiraji, Ghafour Amouzad and Abdul Rashid, Hairul Azhar and Bradley, David A. (2016) Radiotherapy dosimetry and the thermoluminescence characteristics of Ge-doped fibres of differing germanium dopant concentration and outer diameter. Radiation Physics and Chemistry, 126. pp. 56-61. ISSN 0969-806X; ESSN: 1879-0895

Abstract

We examine the influence of elevated dopant concentration on the thermoluminescence characteristics of novel Ge-doped silica fibres. Basic dosimetric characteristics of the TL media were obtained, including linearity, reproducibility, energy dependence, fading, minimum detectable dose and glow curve analysis, use being made of a 60Co gamma irradiation facility (mean energy 1.25 MeV) and an electron linear accelerator producing photons at an accelerating potential of 6 and 10 MV. The 6 mol% Ge-doped fibres were found to provide TL response superior to that of 8- and 10 mol% Ge-doped fibres, both for fibres with outer diameter of 241 µm and 604 µm. Concerning reproducibility, obtained under three different test conditions, at <10% the 6 mol% Ge dopant concentration was observed to provide the superior coefficient of variation (CV). In regard to energy dependence, the 10 mol% Ge doped cylindrical fibres produced the largest gradient values at 0.364 and 0.327 for the 241 µm and 604 µm diameter cylindrical fibres respectively and thus the greatest energy dependency. Measured 33 days post irradiation; the 6 mol% Ge doped cylindrical fibres showed the least TL signal loss, at 21% for the 241 µm cylindrical fibre and <40% for the 604 µm cylindrical fibres. The results also revealed that the 6 mol% optical fibres provided the lowest minimum detectable dose, at 0.027 Gy for 6 MV photon beams. Evaluations of these characteristics are supporting development of novel Ge-doped optical fibres for dosimetry in radiotherapy.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Medicine and Health Science
Centre For Diagnostic Nuclear Imaging
DOI Number: https://doi.org/10.1016/j.radphyschem.2016.05.001
Publisher: Elsevier
Keywords: Dopant concentration; Ge-doped; Linearity; Energy dependence; Fading
Depositing User: Nurul Ainie Mokhtar
Date Deposited: 10 Jan 2018 08:55
Last Modified: 15 Jan 2018 06:15
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.radphyschem.2016.05.001
URI: http://psasir.upm.edu.my/id/eprint/53719
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