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The predose effect in thermoluminescent dosimetry

Itoh, N; Stoneham, D; Stoneham, AM; (2001) The predose effect in thermoluminescent dosimetry. J PHYS-CONDENS MAT , 13 (10) 2201 - 2209. 10.1088/0953-8984/13/10/314. Green open access

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Abstract

We present a model of the predose effect of thermoluminescence in crystalline quartz in terms of known impurities and defect processes. It involves the recombination-induced dissociation of an aluminium-alkali complex [Al M+] and the reaction of an alkali [M+] with an activator [X], possibly Ge, to make the former an efficient electron trap [XM+]. This excitation-induced ionic process is a new feature, in addition to the simple carrier redistribution processes usually assumed, and is consistent with a number of experiments. The test dose detects [X M+], which is present in a concentration within the dynamic range of thermoluminescence measurements. Our model enables us to understand the enhanced sensitivity of the predose method, which has been widely used in archaeological and accident dosimetry, and to link it to established impurity and defect centres in alpha -quartz.

Type: Article
Title: The predose effect in thermoluminescent dosimetry
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/0953-8984/13/10/314
Publisher version: http://dx.doi.org/10.1088/0953-8984/13/10/314
Language: English
Additional information: Text made available to UCL Discovery by kind permission of IOP Publishing, 2012
Keywords: OPTICALLY STIMULATED LUMINESCENCE, RADIATION-INDUCED CONDUCTIVITY, SINGLE IRRADIATION EXCITATION, CRYSTALLINE SIO2, QUARTZ CRYSTALS, ELECTRODIFFUSED QUARTZ, <SIO4/LI>0 CENTER, NATURAL QUARTZ, POINT-DEFECTS, PEAK
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/124331
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