The a-value of polymineral fine grain samples measured with the post-IR IRSL protocol |
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| Institution: | 1. IRAMAT-CRP2A, Université Bordeaux Montaigne, Maison de l''Archéologie, Esplanade des Antilles, 33607 Pessac Cedex, France;2. Department of Geography, Justus-Liebig-University Giessen, 35390 Giessen, Germany;3. Geographical Institute, Geomorphology, University of Bayreuth, 95440 Bayreuth, Germany;4. Institute for Geography, University of Cologne, 50923 Cologne, Germany;5. Department of Physics, East Carolina University, NC 27858 Greenville, USA;1. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, Risø Campus, DK-4000 Roskilde, Denmark;2. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, DK-4000 Roskilde, Denmark;1. Department of Geography, University of Sheffield, Winter Street, Sheffield S10 2TN, United Kingdom;2. Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, Los Angeles, CA 90095, USA;1. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, Denmark;2. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, Risø Campus, DK-4000, Roskilde, Denmark;1. Soil Geography and Landscape Group, Netherlands Centre for Luminescence Dating, Wageningen University, Droevendaalsesteeg 3, 6708 PB Wageningen, The Netherlands;2. Group for Rural Hydrology and Hydraulics, Department of Agronomy, University of Cordoba, Spain;1. Nordic Laboratory for Luminescence Dating, Department of Geosciences, University of Aarhus, Risø Campus, Denmark;2. Center for Nuclear Technologies, Technical University of Denmark, Risø Campus, Denmark;3. Leibniz Institute for Applied Geophysics, S3: Geochronology and Isotope Hydrology, Hannover, Germany;4. School of Geographical and Oceanographical Sciences, Nanjing University, China;5. Department of Earth Sciences, Uppsala University, Sweden;6. Geography, Earth and Environmental Sciences, University of Derby, UK;1. Institute of Earth Surface Dynamics, University of Lausanne, 1015, Lausanne, Switzerland;2. Department of Earth Sciences, ETH Zürich, 8092, Zürich, Switzerland;3. Institute of Geological Sciences, University of Bern, 3012, Bern, Switzerland;4. Free University of Leysin, 1854, Leysin, Switzerland;5. Géosciences Rennes, CNRS UMR 6118, Université de Rennes 1, 35042, Rennes, France;6. Soil Geography and Landscape Group and the Netherlands Centre for Luminescence Dating, Wageningen University, 6708, Wageningen, The Netherlands |
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| Abstract: | Recent post-IR IRSL (pIRIR) dating studies using polymineral fine grains assumed that the a-values obtained for the IRSL signal at 50 °C and the pIRIR signal at higher temperatures (e.g. 225 °C) are identical. However, the a-value of a sample depends on the stimulation method, and the assumption mentioned above remains to be tested. Using five polymineral fine grain samples, this study investigates whether a common a-value can be used for both the IR and the pIRIR signals. Applying the pIRIR protocol, the a-values were measured with three different methods of signal resetting (optical bleaching, end of SAR cycle, heating). In addition, uncorrected α- and β-irradiation induced growth curves were determined for three samples and fitted with single saturating exponential functions. For the investigated samples we found significant mean differences, 0.023 ± 0.012 and higher, in the a-values determined for the IR50 and pIRIR225 signals. Synthetic a-values deduced from uncorrected multiple-aliquot dose response curves seem to confirm this observation. Although, in summary, our results indicate that the practice of using a common a-value should be carefully re-considered, the physical reasons remain to be determined. |
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| Keywords: | α-efficiency post-IR IRSL Polymineral Fine grain Loess Luminescence dating |
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