Response variation of optically stimulated luminescence dosimeters

Asena, Andre, Crowe, Scott, Kairn, Tanya, Dunn, Leon, Cyster, Martin, Williams, Ivan, Charles, Paul, Smith, Shaun, & Trapp, Jamie (2014) Response variation of optically stimulated luminescence dosimeters. Radiation Measurements, 61, pp. 21-24.

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Abstract

This study investigates the variability in response of optically stimulated luminescence dosimeters (OSLDs). Examining the source of sensitivity variations in these dosimeters allows for a more comprehensive understanding of the Landauer nanoDots and their potential for current and future applications. In this work, OSLDs were scanned with a MicroCT scanner to determine potential sources for the variation in relative sensitivity across a selection of Landauer nanoDot dosimeters. Specifically, the correlation between a dosimeters relative sensitivity and the loading density of Al2O3:C powder was determined. When extrapolating the sensitive volume's radiodensity from the CT data, it was shown that there is a non-uniform distribution in crystal growth. It was calculated that a 0.05% change in the nominal volume of the chip produces a 1% change in the overall response. Additionally, the ‘true’ volume of an OSLD's sensitive material is, on average, 18% less than that which has been reported in literature, mainly due to the presence of air cavities in the material's structure. This work demonstrated that the amount of sensitive material is approximately linked to the total correction factor.

Impact and interest:

1 citations in Scopus
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1 citations in Web of Science®

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24 since deposited on 18 Feb 2014
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ID Code: 67493
Item Type: Journal Article
Refereed: Yes
Keywords: optically stimulated luminescence dosimeter, micro computed tomography, element correction factor, response and sensitivity
DOI: 10.1016/j.radmeas.2013.12.004
ISSN: 1350-4487
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OTHER PHYSICAL SCIENCES (029900) > Medical Physics (029903)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Funding:
Copyright Owner: Copyright 2014 Elsevier
Copyright Statement: This is the author’s version of a work that was accepted for publication in Radiation Measurements. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Radiation Measurements, [VOL 61 (2014)] DOI: 10.1016/j.radmeas.2013.12.004
Deposited On: 18 Feb 2014 22:55
Last Modified: 13 Sep 2016 06:42

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