Dosimetric properties of aluminium oxide doped with germanium co-doped with strontium irradiated by cobalt-60 gamma rays

The thermoluminescence (TL) properties of powder Al2O3, Al2O3:Ge and Al2O3:Ge;Sr irradiated by Cobalt-60 gamma rays were studied. The TL properties investigated were the minimum detectable dose, glow curve, trap parameters, linearity, sensitivity, thermal fading and reproducibility. Samples were pre...

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Main Author:	Saharin, Nurul Syazlin
Format:	Thesis
Language:	English
Published:	2020
Subjects:	QC Physics
Online Access:	http://eprints.utm.my/id/eprint/102181/1/NurulSyazlinSaharin2020.pdf.pdf
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spelling	my-utm-ep.1021812023-08-13T06:03:43Z Dosimetric properties of aluminium oxide doped with germanium co-doped with strontium irradiated by cobalt-60 gamma rays 2020 Saharin, Nurul Syazlin QC Physics The thermoluminescence (TL) properties of powder Al2O3, Al2O3:Ge and Al2O3:Ge;Sr irradiated by Cobalt-60 gamma rays were studied. The TL properties investigated were the minimum detectable dose, glow curve, trap parameters, linearity, sensitivity, thermal fading and reproducibility. Samples were prepared using combustion synthesis technique with various heat treatments to study the influence on the TL response. The physical properties of the samples were determined using X-Ray diffraction (XRD), energy dispersive X-ray field emission scanning electron microscopy (EDX-FESEM) and transmission electron microscopy (TEM). The experiments showed that Al2O3:Ge (3.0%);Sr (0.3%) was the best in terms of TL properties compared to other prepared samples. The annealing procedure of the sample was determined at 400 °C for 1h, followed by 80 °C for 16 h with the heating rate of 3 ºC s-1. Analysis of kinetic parameters showed that the sample possessed second order kinetic characteristics supported by the whole glow peak technique. Its activation energy, obtained by peak shape method was E = 1.37 ± 0.14 eV and its frequency factor, s = 4.70 ± 1.18 x 1017 s?1, however by using initial rise method, E = 1.00 ± 0.01 eV and s = 4.36 ± 1.67 × 1010 s?1. The samples exhibited good sensitivity at high dose (10 – 80 Gy) and low dose (0.5 ? 4.0 Gy) with 52.72 nC mg?1 Gy?1 and 43.40 nC mg?1 Gy?1 respectively. In addition, the linearity of the sample was also good at high dose and low dose with correlation coefficient, R2 of 0.9681 and 0.9961 respectively. The fading was low at high dose (50 Gy) and low dose (4 Gy) with the percentage loss of 33% and 34% after 60 days exposed. Furthermore, it also possessed good reproducibility with the percentage of standard deviation of 2.4% (4 Gy) and 6.5% (50 Gy) with the minimum detectable dose of 0.0065 mGy. The existence of main peaks in XRD pattern, TEM micrographs and the results of EDX-FESEM clarified that the sample was in the nano polycrystalline state with size of 9.36 nm and all the required elements were present in the powder sample. In conclusion, Ge 3.0% mol doped, Sr 0.3 mol% co-doped Al2O3, was found to be a potential material to be used as a TL dosimeter which satisfies most of the desirable TL characteristics. 2020 Thesis http://eprints.utm.my/id/eprint/102181/ http://eprints.utm.my/id/eprint/102181/1/NurulSyazlinSaharin2020.pdf.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:146029 phd doctoral Universiti Teknologi Malaysia Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	QC Physics
spellingShingle	QC Physics Saharin, Nurul Syazlin Dosimetric properties of aluminium oxide doped with germanium co-doped with strontium irradiated by cobalt-60 gamma rays
description	The thermoluminescence (TL) properties of powder Al2O3, Al2O3:Ge and Al2O3:Ge;Sr irradiated by Cobalt-60 gamma rays were studied. The TL properties investigated were the minimum detectable dose, glow curve, trap parameters, linearity, sensitivity, thermal fading and reproducibility. Samples were prepared using combustion synthesis technique with various heat treatments to study the influence on the TL response. The physical properties of the samples were determined using X-Ray diffraction (XRD), energy dispersive X-ray field emission scanning electron microscopy (EDX-FESEM) and transmission electron microscopy (TEM). The experiments showed that Al2O3:Ge (3.0%);Sr (0.3%) was the best in terms of TL properties compared to other prepared samples. The annealing procedure of the sample was determined at 400 °C for 1h, followed by 80 °C for 16 h with the heating rate of 3 ºC s-1. Analysis of kinetic parameters showed that the sample possessed second order kinetic characteristics supported by the whole glow peak technique. Its activation energy, obtained by peak shape method was E = 1.37 ± 0.14 eV and its frequency factor, s = 4.70 ± 1.18 x 1017 s?1, however by using initial rise method, E = 1.00 ± 0.01 eV and s = 4.36 ± 1.67 × 1010 s?1. The samples exhibited good sensitivity at high dose (10 – 80 Gy) and low dose (0.5 ? 4.0 Gy) with 52.72 nC mg?1 Gy?1 and 43.40 nC mg?1 Gy?1 respectively. In addition, the linearity of the sample was also good at high dose and low dose with correlation coefficient, R2 of 0.9681 and 0.9961 respectively. The fading was low at high dose (50 Gy) and low dose (4 Gy) with the percentage loss of 33% and 34% after 60 days exposed. Furthermore, it also possessed good reproducibility with the percentage of standard deviation of 2.4% (4 Gy) and 6.5% (50 Gy) with the minimum detectable dose of 0.0065 mGy. The existence of main peaks in XRD pattern, TEM micrographs and the results of EDX-FESEM clarified that the sample was in the nano polycrystalline state with size of 9.36 nm and all the required elements were present in the powder sample. In conclusion, Ge 3.0% mol doped, Sr 0.3 mol% co-doped Al2O3, was found to be a potential material to be used as a TL dosimeter which satisfies most of the desirable TL characteristics.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Saharin, Nurul Syazlin
author_facet	Saharin, Nurul Syazlin
author_sort	Saharin, Nurul Syazlin
title	Dosimetric properties of aluminium oxide doped with germanium co-doped with strontium irradiated by cobalt-60 gamma rays
title_short	Dosimetric properties of aluminium oxide doped with germanium co-doped with strontium irradiated by cobalt-60 gamma rays
title_full	Dosimetric properties of aluminium oxide doped with germanium co-doped with strontium irradiated by cobalt-60 gamma rays
title_fullStr	Dosimetric properties of aluminium oxide doped with germanium co-doped with strontium irradiated by cobalt-60 gamma rays
title_full_unstemmed	Dosimetric properties of aluminium oxide doped with germanium co-doped with strontium irradiated by cobalt-60 gamma rays
title_sort	dosimetric properties of aluminium oxide doped with germanium co-doped with strontium irradiated by cobalt-60 gamma rays
granting_institution	Universiti Teknologi Malaysia
granting_department	Faculty of Science
publishDate	2020
url	http://eprints.utm.my/id/eprint/102181/1/NurulSyazlinSaharin2020.pdf.pdf
_version_	1776100865199833088

Dosimetric properties of aluminium oxide doped with germanium co-doped with strontium irradiated by cobalt-60 gamma rays

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