Thermoluminescence characteristics of silicon optical fibre doped with ytterbium and ytterbium – terbium as photon dosimeter

The study of SiO2 commercial optical fiber explores the useful thermoluminescence (TL) properties and reveals its potential as a TL dosimeter. The present work describes the TL dose response, reproducibility, fading and minimum detectable dose of SiO2: Yb and SiO2: Yb, Tb optical fibers as compared...

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Main Author:	Sahini, Mohd. Hilmi
Format:	Thesis
Language:	English
Published:	2014
Subjects:	QC Physics
Online Access:	http://eprints.utm.my/id/eprint/48926/25/MohdHilmiSahiniMFS2014.pdf
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spelling	my-utm-ep.489262020-07-08T01:54:22Z Thermoluminescence characteristics of silicon optical fibre doped with ytterbium and ytterbium – terbium as photon dosimeter 2014-06 Sahini, Mohd. Hilmi QC Physics The study of SiO2 commercial optical fiber explores the useful thermoluminescence (TL) properties and reveals its potential as a TL dosimeter. The present work describes the TL dose response, reproducibility, fading and minimum detectable dose of SiO2: Yb and SiO2: Yb, Tb optical fibers as compared to TLD-100. The optical fibers were placed in a solid phantom and irradiated with 6 and 10 MV X-rays using LINAC Primus MC 3339 and 1.25 MeV gamma ray from gamma cell. Scanning electron microscopy analysis was performed to determine the dopant concentration and the effective atomic number, Zeff. The dopant concentration of Yb for SiO2: Yb optical fiber was found ranging between 0.23 – 0.35 mol% and for SiO2: Yb, Tb; the dopant concentration of Yb and Tb were in the range of 0.03 – 1.46 mol% and 0.12 – 0.39 mol% respectively. The Zeff value for SiO2: Yb and SiO2: Yb, Tb were 11.19 and 12.27 respectively, which is higher than that of soft tissue (7.42), but close to bone (11.6 – 13.8). In term of TL dose response and sensitivity, SiO2: Yb, Tb optical fiber demonstrated better results than SiO2: Yb optical fiber, but both TL materials were still inferior when compared to TLD-100. SiO2: Yb, Tb optical fiber had the lowest percentage lost in fading of about 5.83%, 15.65% and 18.55% for day 7, 21 and 28 respectively, compared to SiO2: Yb optical fiber which has higher fading of about 55.17% and 95.87% for day 14 and 30 respectively. SiO2: Yb, Tb optical fiber shows good reproducibility results compared to SiO2: Yb optical fiber. The minimum detectable dose of SiO2: Yb and SiO2: Yb, Tb optical fibers were 333 mGy and 19 mGy respectively. In general, it can be concluded that SiO2: Yb, Tb optical fiber is a much better optical fiber to be developed as a new TL dosimeter compared to SiO2: Yb optical fiber. 2014-06 Thesis http://eprints.utm.my/id/eprint/48926/ http://eprints.utm.my/id/eprint/48926/25/MohdHilmiSahiniMFS2014.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:85433 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 Sahini, Mohd. Hilmi Thermoluminescence characteristics of silicon optical fibre doped with ytterbium and ytterbium – terbium as photon dosimeter
description	The study of SiO2 commercial optical fiber explores the useful thermoluminescence (TL) properties and reveals its potential as a TL dosimeter. The present work describes the TL dose response, reproducibility, fading and minimum detectable dose of SiO2: Yb and SiO2: Yb, Tb optical fibers as compared to TLD-100. The optical fibers were placed in a solid phantom and irradiated with 6 and 10 MV X-rays using LINAC Primus MC 3339 and 1.25 MeV gamma ray from gamma cell. Scanning electron microscopy analysis was performed to determine the dopant concentration and the effective atomic number, Zeff. The dopant concentration of Yb for SiO2: Yb optical fiber was found ranging between 0.23 – 0.35 mol% and for SiO2: Yb, Tb; the dopant concentration of Yb and Tb were in the range of 0.03 – 1.46 mol% and 0.12 – 0.39 mol% respectively. The Zeff value for SiO2: Yb and SiO2: Yb, Tb were 11.19 and 12.27 respectively, which is higher than that of soft tissue (7.42), but close to bone (11.6 – 13.8). In term of TL dose response and sensitivity, SiO2: Yb, Tb optical fiber demonstrated better results than SiO2: Yb optical fiber, but both TL materials were still inferior when compared to TLD-100. SiO2: Yb, Tb optical fiber had the lowest percentage lost in fading of about 5.83%, 15.65% and 18.55% for day 7, 21 and 28 respectively, compared to SiO2: Yb optical fiber which has higher fading of about 55.17% and 95.87% for day 14 and 30 respectively. SiO2: Yb, Tb optical fiber shows good reproducibility results compared to SiO2: Yb optical fiber. The minimum detectable dose of SiO2: Yb and SiO2: Yb, Tb optical fibers were 333 mGy and 19 mGy respectively. In general, it can be concluded that SiO2: Yb, Tb optical fiber is a much better optical fiber to be developed as a new TL dosimeter compared to SiO2: Yb optical fiber.
format	Thesis
qualification_level	Master's degree
author	Sahini, Mohd. Hilmi
author_facet	Sahini, Mohd. Hilmi
author_sort	Sahini, Mohd. Hilmi
title	Thermoluminescence characteristics of silicon optical fibre doped with ytterbium and ytterbium – terbium as photon dosimeter
title_short	Thermoluminescence characteristics of silicon optical fibre doped with ytterbium and ytterbium – terbium as photon dosimeter
title_full	Thermoluminescence characteristics of silicon optical fibre doped with ytterbium and ytterbium – terbium as photon dosimeter
title_fullStr	Thermoluminescence characteristics of silicon optical fibre doped with ytterbium and ytterbium – terbium as photon dosimeter
title_full_unstemmed	Thermoluminescence characteristics of silicon optical fibre doped with ytterbium and ytterbium – terbium as photon dosimeter
title_sort	thermoluminescence characteristics of silicon optical fibre doped with ytterbium and ytterbium – terbium as photon dosimeter
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2014
url	http://eprints.utm.my/id/eprint/48926/25/MohdHilmiSahiniMFS2014.pdf
_version_	1747817504337559552

Thermoluminescence characteristics of silicon optical fibre doped with ytterbium and ytterbium – terbium as photon dosimeter

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