Fundamental investigations of natural and laboratory generated SAR dose response curves for quartz OSL in the high dose range

Authors Organisations
  • A. Timar-Gabor(Author)
    Babeş-Bolyai University
  • D. Constantin(Author)
    Babeş-Bolyai University
  • J. P. Buylaert(Author)
    Aarhus University
    Technical University of Denmark
  • M. Jain(Author)
    Technical University of Denmark
  • A. S. Murray(Author)
    Aarhus University
  • Ann Wintle(Author)
Type Article
Original languageEnglish
Pages (from-to)150-156
Number of pages7
JournalRadiation Measurements
Volume81
Early online date21 Jan 2015
DOI
Publication statusPublished - Oct 2015
Event14th International Conference on Luminescence and Electron Spin Resonance Dating - Universite du Quebec a Montreal, Montreal, Canada
Duration: 07 Jul 201411 Jul 2014
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Abstract

SAR-OSL investigations on quartz from Romanian loess resulted in non concordant fine and coarse-grain ages for equivalent doses higher than ∼100 Gy. The laboratory dose response for both grain sizes is well represented by a sum of two saturating exponential functions, fine and coarse grains characterised by D01 and D02 values of ∼140 and ∼1400 Gy and ∼65 and ∼650 Gy respectively. Pulsed OSL experiments confirmed that this behaviour is almost certainly inherent to quartz and not caused by contamination with another mineral. Natural dose–response curves do not follow the same pattern and enter saturation much earlier. Analysis of time resolved spectra indicated similar luminescence lifetimes for both fine and coarse quartz grains, and natural and laboratory generated OSL signals seem to use the same non-dose-dependent recombination pathways. The natural signals of a sample with an expected equivalent dose of 2000–2500 Gy were found to be below the saturation level of the laboratory dose response curve for both grain sizes; this also applied to the luminescence signals measured after >5000 Gy given on top of natural doses

Keywords

  • quartz, CW-OSL, TR-OSL, SAR protocol, dose response