Λεπτομερής προβολή: Fabricated germanium-doped optical fibres for computed tomography dosimetry: Glow curve characteristics

Fabricated germanium-doped optical fibres for computed tomography dosimetry: Glow curve characteristics

Fabricated germanium (Ge)-doped optical fibre glow curve characteristics are investigated with respect to computed tomography (CT) dosimetry. 2.3 mol% and 6 mol% Ge-dopant concentration preforms have been used to produce flat and cylindrical fibres (FF and CF) of various size and diameter. The fibre...

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Κύριοι συγγραφείς:	Rais, N. N. M., Bradley, David Andrew, A., Hashim, Mat Isa, ‪Norshamshina, Osman, Noor Diyana, Itam Ismail, Iskasymar, Abu Hassan, Hasyma, Mohd Noor, Noramaliza
Μορφή:	Άρθρο
Γλώσσα:	English
Έκδοση:	Elsevier 2021
Διαθέσιμο Online:	http://psasir.upm.edu.my/id/eprint/97249/1/ABSTRACT.pdf
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id	oai:psasir.upm.edu.my:97249
record_format	eprints
spelling	oai:psasir.upm.edu.my:97249 http://psasir.upm.edu.my/id/eprint/97249/ Fabricated germanium-doped optical fibres for computed tomography dosimetry: Glow curve characteristics Rais, N. N. M. Bradley, David Andrew A., Hashim Mat Isa, ‪Norshamshina Osman, Noor Diyana Itam Ismail, Iskasymar Abu Hassan, Hasyma Mohd Noor, Noramaliza Fabricated germanium (Ge)-doped optical fibre glow curve characteristics are investigated with respect to computed tomography (CT) dosimetry. 2.3 mol% and 6 mol% Ge-dopant concentration preforms have been used to produce flat and cylindrical fibres (FF and CF) of various size and diameter. The fibres are irradiated to doses of 20, 30 and 40 mGy for each of the beam qualities RQT 8 (100 kV), RQT 9 (120 kV) and RQT 10 (150 kV). The thermoluminescence (TL) kinematic parameters studied are maximum temperature (Tmax), activation energy (Ea) and peak integral (PI). The glow curve formations are reconstructed from the Windows®–based radiation evaluation and management system (WinREMS), deconvoluted using glow curve deconvolution (CGCD) analysis software. The structures of the glow curves are broad single or double-peaked, occurring at relatively high glow peak temperatures, TL response increases with radiation dose and peak height decreases with increasing energy, showing clear photoelectric dependence. The deconvoluted glow curves for all fibres are seen to consist of five individual glow peaks, P1 to P5, P1 being dominant in all cases other than for 6 mol% Ge-FF for which P3 is dominant due to the formation of a double-peaked glow curve. Tmax increases from P1 to P5 for all fibres, throughout the energy range used. P1 and P3 (6 mol% Ge-FF) have the lowest Ea, while P4 shows the greatest Ea for all fibres. The results indicate that electrons in P1 and P3 (6 mol% Ge-FF) are occupied at low energy traps while for P4, the electrons are trapped at a deeper energy level. The lowest PI value, indicative of the least number of electrons, is shown to be that of the deeper trap P4 for all energies investigated. This study provides support for the use of 6 mol% and 2.3 mol% preform fibres for CT dosimetry, each with similar kinetic parameters. Elsevier 2021 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/97249/1/ABSTRACT.pdf Rais, N. N. M. and Bradley, David Andrew and A., Hashim and Mat Isa, ‪Norshamshina and Osman, Noor Diyana and Itam Ismail, Iskasymar and Abu Hassan, Hasyma and Mohd Noor, Noramaliza (2021) Fabricated germanium-doped optical fibres for computed tomography dosimetry: Glow curve characteristics. Radiation Physics and Chemistry, 178. art. no. 108935. pp. 1-8. ISSN 0969-806X https://www.sciencedirect.com/science/article/pii/S0969806X20303285 10.1016/j.radphyschem.2020.108935
institution	UPM IR
collection	UPM IR
language	English
description	Fabricated germanium (Ge)-doped optical fibre glow curve characteristics are investigated with respect to computed tomography (CT) dosimetry. 2.3 mol% and 6 mol% Ge-dopant concentration preforms have been used to produce flat and cylindrical fibres (FF and CF) of various size and diameter. The fibres are irradiated to doses of 20, 30 and 40 mGy for each of the beam qualities RQT 8 (100 kV), RQT 9 (120 kV) and RQT 10 (150 kV). The thermoluminescence (TL) kinematic parameters studied are maximum temperature (Tmax), activation energy (Ea) and peak integral (PI). The glow curve formations are reconstructed from the Windows®–based radiation evaluation and management system (WinREMS), deconvoluted using glow curve deconvolution (CGCD) analysis software. The structures of the glow curves are broad single or double-peaked, occurring at relatively high glow peak temperatures, TL response increases with radiation dose and peak height decreases with increasing energy, showing clear photoelectric dependence. The deconvoluted glow curves for all fibres are seen to consist of five individual glow peaks, P1 to P5, P1 being dominant in all cases other than for 6 mol% Ge-FF for which P3 is dominant due to the formation of a double-peaked glow curve. Tmax increases from P1 to P5 for all fibres, throughout the energy range used. P1 and P3 (6 mol% Ge-FF) have the lowest Ea, while P4 shows the greatest Ea for all fibres. The results indicate that electrons in P1 and P3 (6 mol% Ge-FF) are occupied at low energy traps while for P4, the electrons are trapped at a deeper energy level. The lowest PI value, indicative of the least number of electrons, is shown to be that of the deeper trap P4 for all energies investigated. This study provides support for the use of 6 mol% and 2.3 mol% preform fibres for CT dosimetry, each with similar kinetic parameters.
format	Article
author	Rais, N. N. M. Bradley, David Andrew A., Hashim Mat Isa, ‪Norshamshina Osman, Noor Diyana Itam Ismail, Iskasymar Abu Hassan, Hasyma Mohd Noor, Noramaliza
spellingShingle	Rais, N. N. M. Bradley, David Andrew A., Hashim Mat Isa, ‪Norshamshina Osman, Noor Diyana Itam Ismail, Iskasymar Abu Hassan, Hasyma Mohd Noor, Noramaliza Fabricated germanium-doped optical fibres for computed tomography dosimetry: Glow curve characteristics
author_facet	Rais, N. N. M. Bradley, David Andrew A., Hashim Mat Isa, ‪Norshamshina Osman, Noor Diyana Itam Ismail, Iskasymar Abu Hassan, Hasyma Mohd Noor, Noramaliza
author_sort	Rais, N. N. M.
title	Fabricated germanium-doped optical fibres for computed tomography dosimetry: Glow curve characteristics
title_short	Fabricated germanium-doped optical fibres for computed tomography dosimetry: Glow curve characteristics
title_full	Fabricated germanium-doped optical fibres for computed tomography dosimetry: Glow curve characteristics
title_fullStr	Fabricated germanium-doped optical fibres for computed tomography dosimetry: Glow curve characteristics
title_full_unstemmed	Fabricated germanium-doped optical fibres for computed tomography dosimetry: Glow curve characteristics
title_sort	fabricated germanium-doped optical fibres for computed tomography dosimetry: glow curve characteristics
publisher	Elsevier
publishDate	2021
url	http://psasir.upm.edu.my/id/eprint/97249/1/ABSTRACT.pdf
_version_	1819300917310128128
score	13.4562235

Fabricated germanium-doped optical fibres for computed tomography dosimetry: Glow curve characteristics

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