A new irradiated quartz for beta source calibration

Vicki Hansen, Andrew Sean Murray, Jan-Pieter Buylaert, Eun-Young Yeo, Kristina Jørkov Thomsen

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    Abstract

    For luminescence dating to be an accurate absolute dating technique it is very important that we are able to deliver absolutely known radiation doses in the laboratory. This is normally done using a radiation source (alpha, beta, X-ray) calibrated against an absolutely known reference source. Many laboratories have used the various different batches of Risø calibration quartz for the calibration of beta and X-ray sources, but these have been largely undescribed. Here we describe in detail the preparation and luminescence characteristics of a new quartz standard, based on a North Sea beach sand collected from south-western Denmark (Rømø). Two grain sizes (4-11μm and 180-250μm) have been examined in detail. These were pre-treated (annealed, dosed and annealed again) to sensitise and stabilise the luminescence signals before being given an absolutely known gamma dose from a point 137Cs source in scatter-free geometry. The luminescence characteristics are described; the very intense blue-light stimulated signal is dominated by the fast OSL component and the IR-stimulated signal is negligible. The material is shown to be suitable for measurement using SAR, and the dose recovery ratio is indistinguishable from unity with a standard deviation of 80% of the grains giving a useful signal. Although there is an unexplained dispersion in our calibration data of ~3% (which we cannot attribute to instrument variability), we nevertheless conclude that this material is very suitable for transferring absolute known doses from a standardised gamma source to in-built irradiation sources.
    Original languageEnglish
    JournalRadiation Measurements
    Volume81
    Pages (from-to)123–127
    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

    • Beta source calibration
    • Coarse grain
    • Fine grain
    • OSL
    • Quartz
    • Single grain
    • Dispersions
    • Luminescence
    • Coarse grains
    • Fine grains
    • Irradiation sources
    • Luminescence characteristics
    • Luminescence dating
    • Luminescence signals
    • Single grains
    • Calibration

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