Dose evaluation using multiple-aliquot quartz OSL: Test of methods and a new protocol for improved accuracy and precision

M. Jain, L. Bøtter-Jensen, A.K. Singhvi

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Multiple-aliquot quartz OSL dose-response curves often suffer from substantial variability in the luminescence output from identically treated aliquots (scatter) that leads to large uncertainties in the equivalent-dose estimates. In this study, normalisation and its bearing on the accuracy and precision of the equivalent-dose estimates is investigated. We conclude that the most commonly used procedure employing the natural OSL (natural normalisation), leads to both poor accuracy and poor precision in the equivalent-dose estimates as it is insensitive to possible dose-dependent and non-dose-dependent sensitivity changes during the pre-heat, and fundamental variability in the shapes of quartz OSL (blue-green or blue-light stimulated luminescence) decay forms.

    A new protocol using a combination of 'elevated temperature IR cleaning' (ETIR) and 'component-specific dose normalisation' (CSDN) has been developed. CSDN accounts for variability in the OSL decay forms and absorbs such sensitivity changes. A combination of ETIR and CSDN protocol increased palaeodose precision from +/-100% to +/-4% in quartz separates from the fluvially transported sands in the Thar desert. A comparison with palaeodose estimates from the single-aliquot-regeneration protocol (SAR) gave similar accuracy and precision, (C) 2002 Elsevier Science Ltd. All rights reserved.
    Original languageEnglish
    JournalRadiation Measurements
    Volume37
    Issue number1
    Pages (from-to)67-80
    ISSN1350-4487
    DOIs
    Publication statusPublished - 2003

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