Thermoluminescence and optical characteristics of lithium potassium borate glass for radiation therapy dose measurement

Radiosensitive glasses of lithium potassium borate (LKB) co-doped with CuO-MgO then with TiO2-MgO were prepared using melt-quenching technique. Present studies were carried out, seeking to improve upon the thermoluminescence (TL) signal of such glass systems. The overall aim of this thesis was to de...

Full description

Saved in:

Bibliographic Details
Main Author:	Alajerami, Yasser S. M.
Format:	Thesis
Language:	English
Published:	2014
Subjects:	QC Physics
Online Access:	http://eprints.utm.my/id/eprint/78094/1/YasserSMPFS20141.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-utm-ep.78094
record_format	uketd_dc
spelling	my-utm-ep.780942018-07-23T05:34:32Z Thermoluminescence and optical characteristics of lithium potassium borate glass for radiation therapy dose measurement 2014-01 Alajerami, Yasser S. M. QC Physics Radiosensitive glasses of lithium potassium borate (LKB) co-doped with CuO-MgO then with TiO2-MgO were prepared using melt-quenching technique. Present studies were carried out, seeking to improve upon the thermoluminescence (TL) signal of such glass systems. The overall aim of this thesis was to develop a radiosensitive glass that is suitable for thermoluminescence dosimetry (TLD). A glow curve with single prominent peak was produced at ~220 oC as a result of dopant activation (CuO/TiO2). An enhancement of about three times was shown as a result of adding MgO as a co-dopant activator (LKB: 0.1Cu, 0.1Mg and LKB: 0.5Ti, 0.25Mg- mol%). This enhancement was attributed to the ability of magnesium to create extra traps and consequently energy transfer to monovalent Cu+ and Ti3+ ions. A charge imbalance was predicted in the glass host by the addition of alkaline (Mg2+). Both LKB:Cu,Mg and LKB:Ti,Mg have low Z material (Zeff = 8.55 and 8.89, respectively), good reproducibility and low fading. The prepared glass showed 15 times less sensitive than that of LiF:Mg,Ti (TLD-100), but a promising dose response linearity was achieved over a long span of irradiation doses (up to 103 Gy). The trap parameters, including the order of kinetics (b), activation energy (E) and frequency factor (s) associated with LKB:Cu,Mg were also determined. Furthermore, a TolAnal software was used for glow curve deconvolution and analysis for the created peaks. The photoluminescence spectra (emission and excitation) for the prepared samples were studied. As new mixtures, a series of glass characterization and physical properties were discussed. The achieved results promise the use of these compositions in different dosimetric applications, particularly in medical dosimetry and high dose monitoring. 2014-01 Thesis http://eprints.utm.my/id/eprint/78094/ http://eprints.utm.my/id/eprint/78094/1/YasserSMPFS20141.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:91231 phd doctoral 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 Alajerami, Yasser S. M. Thermoluminescence and optical characteristics of lithium potassium borate glass for radiation therapy dose measurement
description	Radiosensitive glasses of lithium potassium borate (LKB) co-doped with CuO-MgO then with TiO2-MgO were prepared using melt-quenching technique. Present studies were carried out, seeking to improve upon the thermoluminescence (TL) signal of such glass systems. The overall aim of this thesis was to develop a radiosensitive glass that is suitable for thermoluminescence dosimetry (TLD). A glow curve with single prominent peak was produced at ~220 oC as a result of dopant activation (CuO/TiO2). An enhancement of about three times was shown as a result of adding MgO as a co-dopant activator (LKB: 0.1Cu, 0.1Mg and LKB: 0.5Ti, 0.25Mg- mol%). This enhancement was attributed to the ability of magnesium to create extra traps and consequently energy transfer to monovalent Cu+ and Ti3+ ions. A charge imbalance was predicted in the glass host by the addition of alkaline (Mg2+). Both LKB:Cu,Mg and LKB:Ti,Mg have low Z material (Zeff = 8.55 and 8.89, respectively), good reproducibility and low fading. The prepared glass showed 15 times less sensitive than that of LiF:Mg,Ti (TLD-100), but a promising dose response linearity was achieved over a long span of irradiation doses (up to 103 Gy). The trap parameters, including the order of kinetics (b), activation energy (E) and frequency factor (s) associated with LKB:Cu,Mg were also determined. Furthermore, a TolAnal software was used for glow curve deconvolution and analysis for the created peaks. The photoluminescence spectra (emission and excitation) for the prepared samples were studied. As new mixtures, a series of glass characterization and physical properties were discussed. The achieved results promise the use of these compositions in different dosimetric applications, particularly in medical dosimetry and high dose monitoring.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Alajerami, Yasser S. M.
author_facet	Alajerami, Yasser S. M.
author_sort	Alajerami, Yasser S. M.
title	Thermoluminescence and optical characteristics of lithium potassium borate glass for radiation therapy dose measurement
title_short	Thermoluminescence and optical characteristics of lithium potassium borate glass for radiation therapy dose measurement
title_full	Thermoluminescence and optical characteristics of lithium potassium borate glass for radiation therapy dose measurement
title_fullStr	Thermoluminescence and optical characteristics of lithium potassium borate glass for radiation therapy dose measurement
title_full_unstemmed	Thermoluminescence and optical characteristics of lithium potassium borate glass for radiation therapy dose measurement
title_sort	thermoluminescence and optical characteristics of lithium potassium borate glass for radiation therapy dose measurement
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2014
url	http://eprints.utm.my/id/eprint/78094/1/YasserSMPFS20141.pdf
_version_	1747817905531125760

Thermoluminescence and optical characteristics of lithium potassium borate glass for radiation therapy dose measurement

Similar Items