The effect of test dose and first IR stimulation temperature on post-IR IRSL measurements of rock slices

Jinfeng Liu, Andrew Murray, Reza Sohbati, Mayank Jain

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    Abstract

    Optically stimulated luminescence (OSL) is increasingly applied to the dating of rock sur-faces. There is at present no practical way of separating pure minerals (quartz and feldspar) from hard rocks for OSL measurement without losing the grain-size dependent dosimetric information and there is little information about the performance of the single-aliquot regeneration-dose (SAR) measure-ment protocol on the post-infrared infrared stimulated luminescence (pIRIR) signals from rock slices. The latter is investigated here. Our data indicate that there is a systematic increase in dose response curve saturation (or Do) with test dose size when the regeneration doses are first given in increasing order, and then decreasing order. This trend disappears if these orders are reversed. The reproducibility of dose response curves is dependent on the size of the test dose (poorer for small test dose). For rock slices given a saturation dose in the laboratory, it is observed that the sensitivity corrected pIRIR290 signal lies close to saturation level of the dose response curve, for first IR stimulation at temperatures between 50 and 250°C. However, the pIRIR290 signal from naturally saturated slices lies close to the laboratory saturation levels only for higher first IR stimulation temperatures e.g. 200°C or 250°C. Our data confirm earlier suggestions based on sand-grain measurements that, for older sam-ples, accurate measurements close to saturation require that a higher first IR temperature is used.
    Original languageEnglish
    JournalGeochronometria
    Volume43
    Issue number1
    Pages (from-to)179–187
    ISSN1733-8387
    DOIs
    Publication statusPublished - 2016
    Event4th Asia Pacific Luminescence and Electron Spin Resonance Dating Conference - University of Adelaide, Adelaide, Australia
    Duration: 23 Nov 201525 Nov 2015
    Conference number: 4

    Conference

    Conference4th Asia Pacific Luminescence and Electron Spin Resonance Dating Conference
    Number4
    LocationUniversity of Adelaide
    CountryAustralia
    CityAdelaide
    Period23/11/201525/11/2015

    Bibliographical note

    This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License

    Keywords

    • Luminescence dating
    • Rock surface
    • Post-IR IRSL (pIRIR)
    • SAR protocol
    • Test dose correction
    • First IR stimulation temperature

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