Measuring gamma doses over the mGy-kGy range with a single type of TLD detector

Thermo-luminescent detectors are currently used to measure gamma doses in the medical and environmental surveillance fields. During the past few years, the CEA Reactor Studies Division tested and validated the use of these detectors for gamma flux characterization and nuclear heating measurements in...

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Autores principales:	Gruel Adrien, Sardet Alix, Chaussonnet Vincent, Houdouin-Quenault Maxime, Garnier Daniel
Formato:	article
Lenguaje:	EN
Publicado:	EDP Sciences 2021
Materias:	tld calibration gamma dose Physics QC1-999
Acceso en línea:	https://doaj.org/article/d30760b900cf4b48b3f36781bf3d4a06
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spelling	oai:doaj.org-article:d30760b900cf4b48b3f36781bf3d4a062021-12-02T17:12:46ZMeasuring gamma doses over the mGy-kGy range with a single type of TLD detector2100-014X10.1051/epjconf/202125304026https://doaj.org/article/d30760b900cf4b48b3f36781bf3d4a062021-01-01T00:00:00Zhttps://www.epj-conferences.org/articles/epjconf/pdf/2021/07/epjconf_animma2021_04026.pdfhttps://doaj.org/toc/2100-014XThermo-luminescent detectors are currently used to measure gamma doses in the medical and environmental surveillance fields. During the past few years, the CEA Reactor Studies Division tested and validated the use of these detectors for gamma flux characterization and nuclear heating measurements in mixed neutron/gamma fields of low power reactors. Doses were comprised between a few mGy and a few Gy for dose rates up to a few Gy.h-1. However, in MTR or TRIGA reactors, the gamma flux level is much higher (> 1012 n/cm2/s) and the TLD currently in use (CaF2:Mn and 7LiF:Mg,Ti) and their readout protocols were no longer suitable for the resulting doses. In order to extend the applicable dose range up to ∼1 MGy (dose rate of a few kGy.h-1), several options were explored. On one side, some adjustments were made to the readout protocols of CaF2:Mn and 7LiF:Mg,Ti, notably by testing the use of filters to reduce the amount of light received by the reader PMT to avoid saturation. On the other side, a new type of TLD (LiF:Mg,Cu,P) with different Li enrichments (natural or enriched in 7Li) was tested. This paper presents the calibration measurements results performed in pure gamma fields, at the irradiation platform of the CEA Cadarache Radioprotection Division, between 250 mGy and 3 Gy for all detector types. In addition to the calibration, these measurements also studied the Mg,Cu,P-doped detectors response: reproducibility, dose rate dependence, incoming photon energy dependence, high temperature effect when reading TLD, etc. Results show that at low doses Mg,Cu,P-doped TLDs are slightly less stable than CaF2:Mn and 7LiF:Mg,Ti. The sensitivity modification after a high dose exposure seems to indicate that a new protocol readout should be defined for Mg,Cu,P-doped sensors (high temperature peak).Gruel AdrienSardet AlixChaussonnet VincentHoudouin-Quenault MaximeGarnier DanielEDP Sciencesarticletldcalibrationgamma dosePhysicsQC1-999ENEPJ Web of Conferences, Vol 253, p 04026 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	tld calibration gamma dose Physics QC1-999
spellingShingle	tld calibration gamma dose Physics QC1-999 Gruel Adrien Sardet Alix Chaussonnet Vincent Houdouin-Quenault Maxime Garnier Daniel Measuring gamma doses over the mGy-kGy range with a single type of TLD detector
description	Thermo-luminescent detectors are currently used to measure gamma doses in the medical and environmental surveillance fields. During the past few years, the CEA Reactor Studies Division tested and validated the use of these detectors for gamma flux characterization and nuclear heating measurements in mixed neutron/gamma fields of low power reactors. Doses were comprised between a few mGy and a few Gy for dose rates up to a few Gy.h-1. However, in MTR or TRIGA reactors, the gamma flux level is much higher (> 1012 n/cm2/s) and the TLD currently in use (CaF2:Mn and 7LiF:Mg,Ti) and their readout protocols were no longer suitable for the resulting doses. In order to extend the applicable dose range up to ∼1 MGy (dose rate of a few kGy.h-1), several options were explored. On one side, some adjustments were made to the readout protocols of CaF2:Mn and 7LiF:Mg,Ti, notably by testing the use of filters to reduce the amount of light received by the reader PMT to avoid saturation. On the other side, a new type of TLD (LiF:Mg,Cu,P) with different Li enrichments (natural or enriched in 7Li) was tested. This paper presents the calibration measurements results performed in pure gamma fields, at the irradiation platform of the CEA Cadarache Radioprotection Division, between 250 mGy and 3 Gy for all detector types. In addition to the calibration, these measurements also studied the Mg,Cu,P-doped detectors response: reproducibility, dose rate dependence, incoming photon energy dependence, high temperature effect when reading TLD, etc. Results show that at low doses Mg,Cu,P-doped TLDs are slightly less stable than CaF2:Mn and 7LiF:Mg,Ti. The sensitivity modification after a high dose exposure seems to indicate that a new protocol readout should be defined for Mg,Cu,P-doped sensors (high temperature peak).
format	article
author	Gruel Adrien Sardet Alix Chaussonnet Vincent Houdouin-Quenault Maxime Garnier Daniel
author_facet	Gruel Adrien Sardet Alix Chaussonnet Vincent Houdouin-Quenault Maxime Garnier Daniel
author_sort	Gruel Adrien
title	Measuring gamma doses over the mGy-kGy range with a single type of TLD detector
title_short	Measuring gamma doses over the mGy-kGy range with a single type of TLD detector
title_full	Measuring gamma doses over the mGy-kGy range with a single type of TLD detector
title_fullStr	Measuring gamma doses over the mGy-kGy range with a single type of TLD detector
title_full_unstemmed	Measuring gamma doses over the mGy-kGy range with a single type of TLD detector
title_sort	measuring gamma doses over the mgy-kgy range with a single type of tld detector
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/d30760b900cf4b48b3f36781bf3d4a06
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Measuring gamma doses over the mGy-kGy range with a single type of TLD detector

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