Ge-doped silica optical fibre for Time Resolved Radiation Dosimetry


Basaif, A. and Oresegun, Adebiyi and Tarif, Zubair H. and Zin, Hafiz and Choo, Kan Yeep and Ibrahim@Ghazali, Siti Azlida and Abdul Rashid, Hairul Azhar and Bradley, D. A. (2021) Ge-doped silica optical fibre for Time Resolved Radiation Dosimetry. Radiation Physics and Chemistry, 189. p. 109669. ISSN 0969-806X

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Time-resolved radiation dosimetry in radiotherapy helps determine the quality of delivery of patient prescribed doses. Earlier reports on doped silica optical fibres as scintillators in radioluminescence (RL) based radiation dosimetry have indicated particular merits, including versatility, robustness, high spatial resolution, wide dynamic range, and the ability for real-time measurements. Time-resolved radiation dosimetry requires high temporal resolution, enabled using a suitable scintillator and high-speed electronics. We report on the potential of Ge-doped optical fibres as a suitable scintillator to be adopted for use in a time-resolved radiation dosimetry system. High-energy clinical X-ray beams (6 MV) were used to irradiate the Ge-doped optical fibre samples. RL responses were recorded for six dose-rates (between 100 MU/min and 600 MU/min) delivered by a Varian 2100 C/D linear accelerator. The photon-counting circuit gating time was set at its shortest capability of 100 μs? The Ge-doped optical-fibre scintillator showed linear RL response, with minimal observable memory and afterglow and plateau effects. The fluorescence lifetime analysis, demonstrate a calculated rise time of 590.1 ns and a decay time of 0.423 μs, indicating superior performance compared to other scintillator forms. These results demonstrate the potential for the Ge-doped optical-fibre scintillator to be used in a time-resolved radiation dosimetry system.

Item Type: Article
Uncontrolled Keywords: Radioluminescence, Real-time dosimetry, Optical fibre scintillator, Germanium
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
Divisions: Faculty of Engineering (FOE)
Depositing User: Ms Nurul Iqtiani Ahmad
Date Deposited: 05 Aug 2021 06:17
Last Modified: 05 Aug 2021 06:17


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