A luminescence dating intercomparison based on a Danish beach-ridge sand |
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| Affiliation: | 1. Nordic Laboratory for Luminescence Dating, Department of Geoscience, University of Aarhus, Risø Campus, Roskilde, Denmark;2. Center for Nuclear Technologies, Technical University of Denmark, Risø Campus, Roskilde, Denmark;3. Leibniz Institute for Applied Geophysics, Section S3: Geochronology and Isotope Hydrology, Hannover, Germany;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. Leibniz Institute for Applied Geophysics, Stilleweg 2, Hannover 30655, Germany;2. Kogakkan University, 1704 Kodakushimoto-cho, Ise, 516-8555 Japan;3. Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, D-04103 Leipzig, Germany;4. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, DK-4000, Roskilde, Denmark;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. 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. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, Risø Campus, Roskilde, DK, 4000, Denmark;2. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, Roskilde, DK, 4000, Denmark;3. Institute of Applied Geology, University of Natural Resources and Life Sciences, Peter Jordan-Str. 82, Vienna A, 1190, Austria |
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| Abstract: | There is a need for large scale intercomparisons to determine the degree of coherence of luminescence dating measurements made by different laboratories. Here we describe results from a laboratory intercomparison sample based on a quartz-rich aeolian and/or coastal marine sand ridge from the Skagen peninsula, northern Jutland (Denmark). About 200 kg of sand was sampled at night from a single beach ridge. The sand was homogenised using a cement mixer and packed in ∼700 moisture and light-tight bags for distribution. The quartz luminescence characteristics are satisfactory (e.g. fast-component dominated and good dose recovery) and our own equivalent dose determinations and measurements of radionuclide concentrations for twenty of these bags demonstrate the degree of homogenisation. One natural sample and one sample of pre-processed quartz was made available on request; analysis of all the responses gives a mean dose (pre-processed quartz) of 4.58 Gy, σ = 0.40 (n = 26), to be compared to the mean dose (self-extracted quartz) of 4.52 Gy, σ = 0.55 (n = 21). The mean age is 3.99 ± 0.14 ka, σ = 0.71 (n = 22), i.e. a relative standard deviation of 18%. We present an analysis of all the important quantitative and qualitative responses we received between 2007 and 2012 and discuss the implications for our dating community and for users of luminescence ages. |
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| Keywords: | OSL dating Intercomparison Equivalent dose Dose rate Radionuclide analysis |
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