Universiti Teknologi Malaysia Institutional Repository

Effect of photon irradiation on the thermoluminescence response of optical fibres

Mohamad Sharif, Nurul Ain (2013) Effect of photon irradiation on the thermoluminescence response of optical fibres. Masters thesis, Universiti Teknologi Malaysia, Faculty of Science.

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Abstract

Studies on silica glass (SiO2) optical fibre as thermoluminescent materials for medical radiation dosimetry have been conducted by several research groups. This study focuses on the thermoluminescence (TL) response, linearity, sensitivity, dose response, fading, reproducibility and minimum detectable dose of 12 optical fibres sample namely Ge (A) Batch 1, 2 and 3, Ge (B), Multi Photonic Crystal Fibre (MPCF, 220 µm), Multi Photonic Crystal Fibre (MPCF, 2 mm), photonic crystal fibres (PCF), Dummy Flat Fibre (DFF), Flat fiber, Photosensitive Flat Fibre (PFF), Erbium (Er) and Aluminium/ Thulium (Al + Tm) doped optical fibre. A comparison was performed with TLD-100 (chips) to obtain the best TL response among the samples. Irradiation were performed with 6 and 10 MV photons covering the dose range of 1 Gy to 4 Gy by using linear accelerator machine Elekta SynergyTM at Pantai Hospital, Kuala Lumpur and Varian Model 2100C linear accelerator at University Malaya Medical Centre (UMMC). The comparisons of TL response with different model linear accelerators involved in this research were also performed. The results show that the highest sensitivity was obtained by using TLD-100, followed by PFF, Flat, Ge (A) Batch 1, MPCF (2 mm), Ge (A) Batch 3, Ge (A) Batch 2, DFF, Al+Tm, Ge (B), Er, MPCF (220 µm) and PCF. The fading of 5 optical fibres Ge (A) Batch 1, PFF, Er, Flat Fibre and PCF were determined and the loss of the TL signal for these TL materials were 10%, 29%, 30%, 30% and 43%, respectively. The dopant concentrations of Ge (A) Batch 1, Ge (B) and Er were found to be in the range of 0.03-0.72 mol % while the Zeff was in the range of 11.9-17.1. These TL materials have great potential to be introduced as new radiation dosimeters.

Item Type:Thesis (Masters)
Additional Information:Thesis (Sarjana Sains (Fizik)) - Universiti Teknologi Malaysia, 2013; Supervisor : Dr. Suhairul Hashim
Uncontrolled Keywords:photon irradiation, optical fibres
Subjects:Q Science > QC Physics
Divisions:Science
ID Code:47937
Deposited By:INVALID USER
Deposited On:01 Oct 2015 09:51
Last Modified:20 Jun 2017 16:38

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