Thermoluminescence response of doped silicon dioxide optical fibres subjected to electron irradiation

This study was focused on the suitability of commercial optical fibres as a new thermoluminescence dosimeter (TLD). The materials doped to silicon dioxide(SiO2) were germanium type A (Ge (A)) of first, second and third batch, germaniumtype B (Ge (B)), erbium (Er), aluminium and thulium (Al + Tm), ph...

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Main Author:	Buang, Siti Nurbayah
Format:	Thesis
Language:	English
Published:	2014
Subjects:	QC Physics
Online Access:	http://eprints.utm.my/id/eprint/50675/25/SitiNurbayahBuangMFS2014.pdf
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spelling	my-utm-ep.506752020-07-08T03:46:10Z Thermoluminescence response of doped silicon dioxide optical fibres subjected to electron irradiation 2014-01 Buang, Siti Nurbayah QC Physics This study was focused on the suitability of commercial optical fibres as a new thermoluminescence dosimeter (TLD). The materials doped to silicon dioxide(SiO2) were germanium type A (Ge (A)) of first, second and third batch, germaniumtype B (Ge (B)), erbium (Er), aluminium and thulium (Al + Tm), photonic crystalfibre (PCF) of first and second batch, and multi photonic crystal fibres (MPCF). TheMPCF came with different range of core diameter of 220 μm (MPCF 220 μm) and2 mm (MPCF 2 mm). The study also used pure glasses such as photosensitive flatfibre (PFF), flat fibre (FF) and dummy flat fibre (DFF). A comparison of thethermoluminescence (TL) response of electron irradiation concerning sensitivity,linearity, energy dependence, fading signal, reproducibility, minimum detectable dose(MDD) and effective atomic number, Zeff parameters as well as cross-comparisonwith that of TL dosimeter i.e TLD-100 (LiF:Mg,Ti) rods were investigated. Scanningelectron microscopy (SEM) was used to determine the dopant concentration in eachdoped optical fibres. The irradiation was performed using 6 MeV electrons for dosesranging from 1 – 4 Gy at Pantai Hospital and University of Malaya Medical Centreseparately according to the batch. All the optical fibres produced linear dose-TLresponses for dose range of 1 – 4 Gy. TLD-100 produced greater TL sensitivityfollowed by PFF, FF, Ge (A), MPCF 2 mm, DFF, Al + Tm, Er, MPCF 220 μm,Ge (B) and PCF with their relative sensitivity of 0.2, 0.15, 0.08, 0.04, 0.02, 0.01,0.005, 0.004, 0.003 and 0.002 respectively compared to TLD-100. Ge (A) showed7% signal loss followed by PFF, Er, FF and PCF with 15%, 26%, 28% and 33%signal loss respectively after 14 days of irradiation. Reproducibility of Ge (A),Ge (B), Er, PCF, MPCF 2 mm and MPCF 220 μm were poor due to high degree offading. The lowest MDD obtained from TLD-100, followed by FF, Ge (A) 1st batch,Ge (A) 3rd batch and PFF with their MDD of 0.13, 0.9, 4.0, 5.2 and 5.4 mGyrespectively. The Zeff for Ge (B), Ge (A) and Er doped to SiO2 optical fibres were11.88, 12.95 and 20.69 respectively. Several attractive features offered by these fibrespoint to its use in radiation therapy. 2014-01 Thesis http://eprints.utm.my/id/eprint/50675/ http://eprints.utm.my/id/eprint/50675/25/SitiNurbayahBuangMFS2014.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:85431 masters Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	QC Physics
spellingShingle	QC Physics Buang, Siti Nurbayah Thermoluminescence response of doped silicon dioxide optical fibres subjected to electron irradiation
description	This study was focused on the suitability of commercial optical fibres as a new thermoluminescence dosimeter (TLD). The materials doped to silicon dioxide(SiO2) were germanium type A (Ge (A)) of first, second and third batch, germaniumtype B (Ge (B)), erbium (Er), aluminium and thulium (Al + Tm), photonic crystalfibre (PCF) of first and second batch, and multi photonic crystal fibres (MPCF). TheMPCF came with different range of core diameter of 220 μm (MPCF 220 μm) and2 mm (MPCF 2 mm). The study also used pure glasses such as photosensitive flatfibre (PFF), flat fibre (FF) and dummy flat fibre (DFF). A comparison of thethermoluminescence (TL) response of electron irradiation concerning sensitivity,linearity, energy dependence, fading signal, reproducibility, minimum detectable dose(MDD) and effective atomic number, Zeff parameters as well as cross-comparisonwith that of TL dosimeter i.e TLD-100 (LiF:Mg,Ti) rods were investigated. Scanningelectron microscopy (SEM) was used to determine the dopant concentration in eachdoped optical fibres. The irradiation was performed using 6 MeV electrons for dosesranging from 1 – 4 Gy at Pantai Hospital and University of Malaya Medical Centreseparately according to the batch. All the optical fibres produced linear dose-TLresponses for dose range of 1 – 4 Gy. TLD-100 produced greater TL sensitivityfollowed by PFF, FF, Ge (A), MPCF 2 mm, DFF, Al + Tm, Er, MPCF 220 μm,Ge (B) and PCF with their relative sensitivity of 0.2, 0.15, 0.08, 0.04, 0.02, 0.01,0.005, 0.004, 0.003 and 0.002 respectively compared to TLD-100. Ge (A) showed7% signal loss followed by PFF, Er, FF and PCF with 15%, 26%, 28% and 33%signal loss respectively after 14 days of irradiation. Reproducibility of Ge (A),Ge (B), Er, PCF, MPCF 2 mm and MPCF 220 μm were poor due to high degree offading. The lowest MDD obtained from TLD-100, followed by FF, Ge (A) 1st batch,Ge (A) 3rd batch and PFF with their MDD of 0.13, 0.9, 4.0, 5.2 and 5.4 mGyrespectively. The Zeff for Ge (B), Ge (A) and Er doped to SiO2 optical fibres were11.88, 12.95 and 20.69 respectively. Several attractive features offered by these fibrespoint to its use in radiation therapy.
format	Thesis
qualification_level	Master's degree
author	Buang, Siti Nurbayah
author_facet	Buang, Siti Nurbayah
author_sort	Buang, Siti Nurbayah
title	Thermoluminescence response of doped silicon dioxide optical fibres subjected to electron irradiation
title_short	Thermoluminescence response of doped silicon dioxide optical fibres subjected to electron irradiation
title_full	Thermoluminescence response of doped silicon dioxide optical fibres subjected to electron irradiation
title_fullStr	Thermoluminescence response of doped silicon dioxide optical fibres subjected to electron irradiation
title_full_unstemmed	Thermoluminescence response of doped silicon dioxide optical fibres subjected to electron irradiation
title_sort	thermoluminescence response of doped silicon dioxide optical fibres subjected to electron irradiation
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2014
url	http://eprints.utm.my/id/eprint/50675/25/SitiNurbayahBuangMFS2014.pdf
_version_	1747817508970168320

Thermoluminescence response of doped silicon dioxide optical fibres subjected to electron irradiation

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