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Thermally Assisted Optically Stimulated Luminescence (TA-OSL) from Commercial BeO Dosimeters

BeO is another luminescent phosphor with very deep traps (VDTs) in its matrix that could not be stimulated using either thermal or conventional optical stimulations. The present study attempts to stimulate these traps using thermally assisted optically stimulated luminescence (TA-OSL), a combination...

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Autor principal: Polymeris, Georgios S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9958777/
https://www.ncbi.nlm.nih.gov/pubmed/36837123
http://dx.doi.org/10.3390/ma16041494
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author Polymeris, Georgios S.
author_facet Polymeris, Georgios S.
author_sort Polymeris, Georgios S.
collection PubMed
description BeO is another luminescent phosphor with very deep traps (VDTs) in its matrix that could not be stimulated using either thermal or conventional optical stimulations. The present study attempts to stimulate these traps using thermally assisted optically stimulated luminescence (TA-OSL), a combination of simultaneous thermal and optical stimulation that is applied to the material following a thermoluminescence measurement up to 500 °C. An intense, peak-shaped TA-OSL signal is measured throughout the entire temperature range between room temperature and 270 °C. This signal can be explained as the transfer of charges from VDTs to both dosimetric TL traps. Experimental features such as the peaked shape of the signal along with the presence of residual TL after the TA-OSL suggest that recombination of TA-OSL takes place via the conduction band. Isothermal TA-OSL is not effective for extending the maximum detection dose thresholds of BeO, unlike minerals such as quartz and aluminum oxide. Nevertheless, TA-OSL could be effectively used in order to either (a) control the occupancy of VDTs, circumventing the intense sensitivity changes induced by long-term uses and high accumulated dose to the VDTs, or (b) measure the total dose accumulated over a series of repetitive dose calculations.
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spelling pubmed-99587772023-02-26 Thermally Assisted Optically Stimulated Luminescence (TA-OSL) from Commercial BeO Dosimeters Polymeris, Georgios S. Materials (Basel) Article BeO is another luminescent phosphor with very deep traps (VDTs) in its matrix that could not be stimulated using either thermal or conventional optical stimulations. The present study attempts to stimulate these traps using thermally assisted optically stimulated luminescence (TA-OSL), a combination of simultaneous thermal and optical stimulation that is applied to the material following a thermoluminescence measurement up to 500 °C. An intense, peak-shaped TA-OSL signal is measured throughout the entire temperature range between room temperature and 270 °C. This signal can be explained as the transfer of charges from VDTs to both dosimetric TL traps. Experimental features such as the peaked shape of the signal along with the presence of residual TL after the TA-OSL suggest that recombination of TA-OSL takes place via the conduction band. Isothermal TA-OSL is not effective for extending the maximum detection dose thresholds of BeO, unlike minerals such as quartz and aluminum oxide. Nevertheless, TA-OSL could be effectively used in order to either (a) control the occupancy of VDTs, circumventing the intense sensitivity changes induced by long-term uses and high accumulated dose to the VDTs, or (b) measure the total dose accumulated over a series of repetitive dose calculations. MDPI 2023-02-10 /pmc/articles/PMC9958777/ /pubmed/36837123 http://dx.doi.org/10.3390/ma16041494 Text en © 2023 by the author. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Polymeris, Georgios S.
Thermally Assisted Optically Stimulated Luminescence (TA-OSL) from Commercial BeO Dosimeters
title Thermally Assisted Optically Stimulated Luminescence (TA-OSL) from Commercial BeO Dosimeters
title_full Thermally Assisted Optically Stimulated Luminescence (TA-OSL) from Commercial BeO Dosimeters
title_fullStr Thermally Assisted Optically Stimulated Luminescence (TA-OSL) from Commercial BeO Dosimeters
title_full_unstemmed Thermally Assisted Optically Stimulated Luminescence (TA-OSL) from Commercial BeO Dosimeters
title_short Thermally Assisted Optically Stimulated Luminescence (TA-OSL) from Commercial BeO Dosimeters
title_sort thermally assisted optically stimulated luminescence (ta-osl) from commercial beo dosimeters
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9958777/
https://www.ncbi.nlm.nih.gov/pubmed/36837123
http://dx.doi.org/10.3390/ma16041494
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