Dosimetric properties of lithium magnesium borate glasses doped with dysprosium and phosphorus oxide for radiation dose measurement

Series of lithium and magnesium oxide modified borate glasses of compositions 30Li2O – (70 – x) B2O3 – xDy2O3 where 0 = x = 1 mol % (LB:Dy), 20Li2O – 10MgO – (70-x) B2O3 – xDy2O3 where 0.3 = x = 1 mol % (LMB:Dy) and 20Li2O – 10MgO – (69.5 – x) B2O3 – 0.5Dy2O3 – xP2O5 where 0.5 = x = 2 mol % (LMB:Dy,...

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Main Author:	Abu Mhareb, Mohammad Hasan Salman
Format:	Thesis
Language:	English
Published:	2015
Subjects:	Q Science (General)
Online Access:	http://eprints.utm.my/id/eprint/54799/1/MohammadHasanSalmanPFS2015.pdf
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spelling	my-utm-ep.547992020-11-07T01:50:37Z Dosimetric properties of lithium magnesium borate glasses doped with dysprosium and phosphorus oxide for radiation dose measurement 2015-10 Abu Mhareb, Mohammad Hasan Salman Q Science (General) Series of lithium and magnesium oxide modified borate glasses of compositions 30Li2O – (70 – x) B2O3 – xDy2O3 where 0 = x = 1 mol % (LB:Dy), 20Li2O – 10MgO – (70-x) B2O3 – xDy2O3 where 0.3 = x = 1 mol % (LMB:Dy) and 20Li2O – 10MgO – (69.5 – x) B2O3 – 0.5Dy2O3 – xP2O5 where 0.5 = x = 2 mol % (LMB:Dy,P) were prepared using melt-quenching method. The present study was performed with the aim of improving the thermoluminescence (TL) properties of lithium borate glass. The prepared glass samples were characterized by X-Ray diffraction (XRD) and differential thermal analysis (DTA). The room temperature photoluminescence (PL) emission spectra of the glass series at 350 nm excitation consist of two peaks centered at 481 nm and 573 nm corresponding to the transitions (4F9/2 ? 6H15/2) and (4F9/2 ? 6H13/2), respectively. The TL glow curves of LB:Dy (0.5 mol %) revealed a single prominent peak at a maximum temperature (Tm) of 190 °C. An enhancement of TL response about 1.4 times was observed with the presence of MgO as a second modifier to lithium borate. The addition of P2O5 as co-dopant into LMB:Dy (0.5 mol %) enhanced the TL intensity by a factor of 2.2, with the increase of P2O5 concentration up to 1 mol % and quenching effects occurred beyond this concentration value. LMB:Dy,P was found to have a good effective atomic number (Zeff=9.05), linear dose response up to 100 Gy and showed a higher TL response compared to LMB:Dy and LB:Dy. The study of fading characteristic showed that LMB:Dy,P glass has lower fading compared to LMB:Dy and LB:Dy. The trap parameters, including the order of kinetics, activation energy (E) and frequency factor (s) for the glass samples were also determined. In conclusion, the prepared glasses have potential as a thermoluminescence material for radiation monitoring and dose measurement. 2015-10 Thesis http://eprints.utm.my/id/eprint/54799/ http://eprints.utm.my/id/eprint/54799/1/MohammadHasanSalmanPFS2015.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:90907 phd doctoral Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	Q Science (General)
spellingShingle	Q Science (General) Abu Mhareb, Mohammad Hasan Salman Dosimetric properties of lithium magnesium borate glasses doped with dysprosium and phosphorus oxide for radiation dose measurement
description	Series of lithium and magnesium oxide modified borate glasses of compositions 30Li2O – (70 – x) B2O3 – xDy2O3 where 0 = x = 1 mol % (LB:Dy), 20Li2O – 10MgO – (70-x) B2O3 – xDy2O3 where 0.3 = x = 1 mol % (LMB:Dy) and 20Li2O – 10MgO – (69.5 – x) B2O3 – 0.5Dy2O3 – xP2O5 where 0.5 = x = 2 mol % (LMB:Dy,P) were prepared using melt-quenching method. The present study was performed with the aim of improving the thermoluminescence (TL) properties of lithium borate glass. The prepared glass samples were characterized by X-Ray diffraction (XRD) and differential thermal analysis (DTA). The room temperature photoluminescence (PL) emission spectra of the glass series at 350 nm excitation consist of two peaks centered at 481 nm and 573 nm corresponding to the transitions (4F9/2 ? 6H15/2) and (4F9/2 ? 6H13/2), respectively. The TL glow curves of LB:Dy (0.5 mol %) revealed a single prominent peak at a maximum temperature (Tm) of 190 °C. An enhancement of TL response about 1.4 times was observed with the presence of MgO as a second modifier to lithium borate. The addition of P2O5 as co-dopant into LMB:Dy (0.5 mol %) enhanced the TL intensity by a factor of 2.2, with the increase of P2O5 concentration up to 1 mol % and quenching effects occurred beyond this concentration value. LMB:Dy,P was found to have a good effective atomic number (Zeff=9.05), linear dose response up to 100 Gy and showed a higher TL response compared to LMB:Dy and LB:Dy. The study of fading characteristic showed that LMB:Dy,P glass has lower fading compared to LMB:Dy and LB:Dy. The trap parameters, including the order of kinetics, activation energy (E) and frequency factor (s) for the glass samples were also determined. In conclusion, the prepared glasses have potential as a thermoluminescence material for radiation monitoring and dose measurement.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Abu Mhareb, Mohammad Hasan Salman
author_facet	Abu Mhareb, Mohammad Hasan Salman
author_sort	Abu Mhareb, Mohammad Hasan Salman
title	Dosimetric properties of lithium magnesium borate glasses doped with dysprosium and phosphorus oxide for radiation dose measurement
title_short	Dosimetric properties of lithium magnesium borate glasses doped with dysprosium and phosphorus oxide for radiation dose measurement
title_full	Dosimetric properties of lithium magnesium borate glasses doped with dysprosium and phosphorus oxide for radiation dose measurement
title_fullStr	Dosimetric properties of lithium magnesium borate glasses doped with dysprosium and phosphorus oxide for radiation dose measurement
title_full_unstemmed	Dosimetric properties of lithium magnesium borate glasses doped with dysprosium and phosphorus oxide for radiation dose measurement
title_sort	dosimetric properties of lithium magnesium borate glasses doped with dysprosium and phosphorus oxide for radiation dose measurement
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2015
url	http://eprints.utm.my/id/eprint/54799/1/MohammadHasanSalmanPFS2015.pdf
_version_	1747817729674444800

Dosimetric properties of lithium magnesium borate glasses doped with dysprosium and phosphorus oxide for radiation dose measurement

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