OSL and TL techniques combined in a beryllium oxide detector to evaluate simultaneously accumulated and single doses

OSL and TL techniques combined in a beryllium oxide detector to evaluate simultaneously accumulated and single doses

Author Malthez, Anna L. M. C. Google Scholar
Freitas, Marcelo B. Autor UNIFESP Google Scholar
Yoshimura, Elisabeth M. Google Scholar
Umisedo, Nancy K. Google Scholar
Button, Vera L. S. N. Google Scholar
Abstract Optically stimulated luminescence (OSL) and thermoluminescence (TL) are similar techniques widely used in radiation dosimetry. The main difference between these techniques is the stimulus to induce luminescence emission: TL technique uses thermal stimulation, whereas OSL uses optical stimulation. One of the main intrinsic characteristics of the OSL technique is the possibility of reading several times the dosimetric materials with a negligible loss of signal. In the case of BeO, recent studies have shown that TL stimulation up to 250 degrees C does not affect its OSL signal. Taking the advantages of dosimetric characteristics of BeO combined with both techniques, in this study, we demonstrated the possibility of measuring accumulated and single doses in the same BeO-based detector in order to use it to improve individual monitoring of radiation workers exposed to X-ray or gamma-ray fields. Single doses were measured using TL technique by heating the detector up to 250 degrees C, whereas accumulated doses were estimated using OSL technique in the same detector in a relatively short time of optical stimulation. The detectors were exposed to two energies: 28 keV X-rays and 1.25 MeV Co-60 gamma rays. The doses estimated by OSL and TL of BeO (Thermalox 995) were compared with those obtained with LiF (TLD-100) and recorded with a calibrated ionization chamber. The results indicate that combined OSL and TL signals of BeO detectors can provide additional information of accumulated dose, with additional exploration of the advantages of both techniques, such as speed in readouts with OSL, and double-check the doses using TL and OSL intensities from BeO. (C) 2016 Elsevier Ltd. All rights reserved.
Keywords Personal dosimetry
Optically stimulated luminescence
Thermally stimulated luminescence
Beryllium oxide detector
xmlui.dri2xhtml.METS-1.0.item-coverage Oxford
Language English
Sponsor State of Sao Paulo Research Foundation FAPESP/Brazil
Coordination for the Improvement of Higher Education Personnel (CAPES/Brazil)
Grant number FAPESP: 2010/16437-0
Date 2016
Published in Applied Radiation And Isotopes. Oxford, v. 110, p. 155-159, 2016.
ISSN 0969-8043 (Sherpa/Romeo, impact factor)
Publisher Pergamon-Elsevier Science Ltd
Extent 155-159
Origin http://dx.doi.org/10.1016/j.apradiso.2016.01.015
Access rights Closed access
Type Article
Web of Science ID WOS:000372380900021
URI https://repositorio.unifesp.br/handle/11600/56184

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