Absorbed dose,equivalent dose,measured dose rates,and implications for OSL age estimates: Introducing the Average Dose Model |
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| Institution: | 1. UMR 5060 CNRS - Université Bordeaux Montaigne, IRAMAT-CRP2A, Maison de l''archéologie, Esplanade des Antilles, 33607 Pessac cedex, France;2. Jean Leray Laboratory of Mathematics (LMJL), UMR6629 CNRS - Université de Nantes, France;3. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, DTU Risø Campus, DK-4000 Roskilde, Denmark;4. 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. Department of Earth and Environmental Sciences, Tulane University, New Orleans, LA, USA;2. Netherlands Centre for Luminescence Dating & Soil Geography and Landscape Group, Wageningen University, Wageningen, The Netherlands;3. Department of Earth and Environmental Sciences, Vanderbilt University, Nashville, TN, USA;4. Lamont-Doherty Earth Observatory of Columbia University, Palisades, USA;5. Department of Marine Science, Coastal Carolina University, Conway, SC, USA;1. Institute for Geology, University of Innsbruck, 6020, Austria;2. ARC Centre of Excellence for Australian Biodiversity and Heritage, GeoQuest Research Centre, University of Wollongong, 2500, Australia;1. U.S. Geological Survey, Denver Federal Ctr., MS 974, Denver, CO 80225-5046, USA;2. Massachusetts Archeological Society, 50 Village Ave., Dedham, MA 02026, USA;3. New England Antiquities Research Association, 58 Cortland Road, Milford, NH 03055, USA;4. Town of Upton Historical Commission, 14 Plain St, Upton, MA 01568, USA;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 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 |
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| Abstract: | Luminescence ages are calculated by dividing an absorbed dose by the dose rate to which the natural dosimeter has been exposed. In practice, one measures an equivalent dose, De; in the absence of an alpha dose contribution, this should be indistinguishable from the dose absorbed in nature. Here we first review the relationship between absorbed dose, equivalent dose and dose rate, and the measurements that lead to their estimation; we restate that, in contrast to recent suggestions, an equivalent dose is not a physically different quantity from a beta or gamma dose absorbed by quartz grains. Statistical analysis of OSL data is of great importance when dealing with single grain data, since such data commonly exhibit significant scatter. However, dose rate measurements provide an arithmetic mean of dose rates absorbed by individual grains; in this article, we propose a new model to estimate the average dose absorbed by the grains. We thus introduce a new model for OSL age estimates: the Average Dose Model (ADM). We argue that ADM ages should be more accurate than Central Age Model (CAM) based ages, and we provide experimental evidence supporting this expectation. We also argue that the use of the Finite Mixture Model should be avoided. Finally, we discuss the implications for multi-grain age estimates derived from well-bleached samples. |
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| Keywords: | OSL data analysis Dose rate measurements Central Age Model Average Dose Model |
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