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Radiation Protection Dosimetry Advance Access published online on April 3, 2006
Radiation Protection Dosimetry, doi:10.1093/rpd/nci591
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

SSD 2004 Special Issue Articles

IONISATION DENSITY DEPENDENCE OF THE OPTICALLY AND THERMALLY STIMULATED LUMINESCENCE FROM Al2O3:C

Eduardo G. Yukihara 1 * and Stephen W. S. McKeever 1

1 Department of Physics, Oklahoma State University, Stillwater, OK 74078, USA

* To whom correspondence should be addressed.
Eduardo G. Yukihara, E-mail: eduyuk{at}okstate.edu


  Abstract

This paper presents an overview of recent results on ionisation density dependence of the thermally stimulated luminescence (TL) and optically stimulated luminescence (OSL) signals from Al2O3:C, with emphasis on the sensitivity, efficiency, shape of the TL/OSL curves and the emission spectrum. High-ionisation densities are created uniformly by accumulated high doses of low-linear energy transfer radiation (gamma, beta, X rays) or non-uniformly in heavy charged particle tracks, even at low fluences, as in the case of space radiation fields. Significant deep trap filling, which occurs at these high-ionisation densities, ultimately results in changes in the concentration of recombination centres (F+-centres) and, consequently, in sensitivity changes and other effects. An OSL emission band at 335 nm has been observed in addition to the main F-centre luminescence band, and the relative intensities of these bands have been observed to be dependent on the ionisation density. The implications of these results and open issues are discussed.


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