On natural and laboratory generated dose response curves for quartz of different grain sizes from Romanian loess |
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| Institution: | 1. Faculty of Environmental Science and Engineering, Babe?-Bolyai University, Fântânele 30, 400294 Cluj Napoca, Romania;2. Interdisciplinary Research Institute on Bio-Nano-Science of Babe?-Bolyai University, Treboniu Laurean 42, 400271 Cluj-Napoca, Romania;3. Institute of Geography and Earth Sciences, Aberystwyth University, Aberystwyth SY23 3DB, UK;4. McDonald Institute for Archaeological Research, University of Cambridge, Downing Street, Cambridge CB2 3ER, UK;1. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, Roskilde, Denmark;2. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, Risø Campus, Roskilde, Denmark;3. Department of Earth Sciences, ETH-Zurich, 8092 Zurich, Switzerland;1. Department of Science, Systems and Models, Roskilde University, Denmark;2. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, Denmark;3. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, Denmark;4. Institute for Ancient Near Eastern Archaeology, Free University Berlin, Germany;5. DNRF Centre “Glass and Time,” Department of Science, Systems and Models, Roskilde University, Denmark;1. Romanian Academy, Institute of Speleology, Clinicilor 5, 400006, Cluj-Napoca, Romania;2. Interdisciplinary Research Institute on Bio-Nano-Science of Babe?-Bolyai University, Treboniu Laurean 42, 400271, Cluj-Napoca, Romania;3. Faculty of Environmental Sciences and Engineering, Babe?-Bolyai University, Fântânele 30, 400294, Cluj-Napoca, Romania;4. Taras Shevshenko National University, Glushkova Prospect 2a, 03127, Kiev, Ukraine;5. IMCCE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ Paris 06, Univ Lille, 75014, Paris, France;6. BayCEER& Chair of Geomorphology, University of Bayreuth, D-95440, Bayreuth, Germany;1. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, DTU Risø Campus, Roskilde 4000, Denmark;2. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, Roskilde 4000, Denmark;3. Geological Survey of Israel, 30 Malkhe Israel Street, Jerusalem 95501, Israel;4. Dead Sea-Arava Science Center, Patio 655, Eilat 88133, Israel;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. Faculty of Environmental Science and Engineering, Babe?-Bolyai University, Fântânele 30, 400294 Cluj-Napoca, Romania;2. Interdisciplinary Research Institute on Bio-Nano-Sciences, Babe?-Bolyai University, Treboniu Laurean 42, 400271 Cluj-Napoca, Romania;3. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, DK-4000 Roskilde, Denmark;4. Nordic Laboratory for Luminescence Dating, Department of Geoscience, University of Aarhus, Risø Campus, Frederiksborgvej 399, 4000 Roskilde, Denmark;5. Risø High Dose Reference Laboratory, Technical University of Denmark, DTU Risø Campus, DK-4000 Roskilde, Denmark |
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| Abstract: | One of the most important foundations of luminescence dating is the assumption that the growth of the luminescence signal in nature can be reproduced under laboratory conditions by performing irradiations with a calibrated beta or gamma source. When optically stimulated luminescence (OSL) of quartz with a dominant fast component is measured using the single aliquot regenerative dose (SAR) protocol, laboratory dose response curves that display continuing growth at high doses are increasingly reported in literature. In this study we investigate fine (4–11 μm) and coarse (63–90 μm) quartz extracted from 25 samples taken from L1, S1 and L2 units from the loess-palaeosol section at Costine?ti in Romania. Our results indicate that the growth of the OSL signal in nature does not correspond to the laboratory generated laboratory dose response curve. The growth of the signal in nature is consistent with a single saturating exponential function, with the signal of coarse grains starting to saturate at 100–200 Gy, and for fine grains at 200–300 Gy, respectively. Laboratory dose response curves continue to grow for high doses (>300 Gy) for both quartz fractions. The differences observed between the natural and the laboratory dose response for the two quartz fractions are believed to be a cause for the different chronologies previously reported using the two grain sizes of quartz on Romanian loess. In addition, we have applied the single aliquot regeneration and added dose (SARA) procedure to both fine and coarse grains from the youngest sample. Our findings question the reliability of obtaining high equivalent doses for quartz samples displaying laboratory dose response curves obtained by the SAR protocol for which a single saturating exponential model does not describe the data. |
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| Keywords: | Quartz OSL SAR Dose response Saturation characteristics SARA |
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