Dependence of (anomalous) fading of infra-red stimulated luminescence on trap occupancy in feldspars

P. Morthekai, Mayank Jain, Grzegorz Gach, Dennis Ringkjøbing Elema, Henrik Prip

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    Abstract

    Dose dependency of anomalous fading of infra-red stimulated luminescence (IRSL) from feldspars has been investigated using radiations of different ionisation qualities. The rate of fading of the IRSL signal after proton irradiation (9.4–30%/decade) is on an average almost twice compared to that after 90Sr/90Y beta particle irradiation (3.5–15%/decade) for all the measured feldspar mineral specimens. Similarly, the fading rates after x-rays of 50 kV and 10 kV fall in between those of beta particle and proton irradiations. Our results suggest that rate of anomalous fading in feldspars depends on the number density of the trapped charge carriers. These results support the hypothesis that anomalous fading occurs across randomly distributed donor-acceptor distances as opposed to pairs with a fixed distance.
    Original languageEnglish
    JournalJournal of Luminescence
    Volume143
    Pages (from-to)704–709
    ISSN0022-2313
    DOIs
    Publication statusPublished - 2013

    Keywords

    • LET effects
    • Fading rate
    • Infra-red stimulated luminescence
    • Feldspar
    • Tunnelling

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