Quartz luminescence response to a mixed alpha-beta field: Investigations on Romanian loess

Daniela Constantin, Mayank Jain, Andrew S. Murray, Jan-Pieter Buylaert, Alida Timar-Gabor

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    Abstract

    Previous SAR-OSL dating studies using quartz extracted from Romanian and Serbian loess samples report SAR-OSL dose-response curves on fine grained (4-11μm) quartz that grow to much higher doses compared to those of coarse-grained (63-90, 90-125, 125-180μm) quartz. Furthermore, quartz SAR-OSL laboratory dose response curves do not reflect the growth of the OSL signal in nature. A main difference in coarse- and fine-grained quartz dating lies in the alpha irradiation history, but the effect of mixed alpha-beta fields has so far received little attention. In the present study we investigate whether the alpha dose experienced by fine grains over geological cycles of irradiation and bleaching may have an effect on the saturation characteristics of the laboratory dose response. By applying time resolved optically stimulated luminescence we confirm that the OSL signals induced in quartz by alpha and beta radiation follow the same recombination path. We also show that a mixed alpha-beta dose response reproduces the beta dose response only up to about 800Gy. Assuming an a-value of 0.04 we have shown that laboratory alpha and beta dose response curves overlap up to effective alpha doses of ~50Gy. Based on these results, we conclude that exposure of fine grains to alpha radiation during burial and transport cycles prior to deposition, as well exposure to the mixed radiation field experienced during burial are not responsible for the age discrepancies previously reported on fine and coarse grained quartz extracted from Romanian and Serbian loess.
    Original languageEnglish
    JournalRadiation Measurements
    Volume81
    Pages (from-to)110–115
    ISSN1350-4487
    DOIs
    Publication statusPublished - 2015
    Event14th International Conference on Luminescence and Electron Spin Resonance Dating - Montréal, Canada
    Duration: 7 Jul 201511 Jul 2015
    Conference number: 14

    Conference

    Conference14th International Conference on Luminescence and Electron Spin Resonance Dating
    Number14
    CountryCanada
    CityMontréal
    Period07/07/201511/07/2015

    Keywords

    • Alpha radiation
    • Beta radiation
    • OSL
    • Quartz

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