Exploring fading in single grain feldspar IRSL measurements |
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| Institution: | 1. Institute of Geological Sciences, University of Bern, Baltzerstrasse 1+3, 3012 Bern, Switzerland;2. Department of Physical Geography and Quaternary Geology, Stockholm University, 10691 Stockholm, Sweden;1. Faculty of Applied Science, Department of Luminescence Materials and Radiation Detection, Delft University of Technology, Netherlands;2. Netherlands Centre for Luminescence Dating (NCL), Wageningen University, Netherlands;3. Soil Geography and Landscape Group, Wageningen University, Netherlands;1. Utah State University, Department of Geology, Logan, UT, USA;2. University of Minnesota-Morris, Division of Math and Science, Morris, MN, USA;3. Minnesota Department of Natural Resources, St. Paul Minnesota, USA;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;1. Institute of Marine Sciences, Guangdong Provincial Key Laboratory of Marine Biotechnology, Shantou University, Shantou, 515063, China;2. Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China;3. College of Geography and Environmental Science, Northwest Normal University, Lanzhou, 730070, China;4. Department of Anthropology, University of Nevada-Reno, Reno, NV, 89557, USA;1. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;2. Laboratory for Earth Surface Processes, Department of Geography, Peking University, Beijing 100871, China |
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| Abstract: | IR laser stimulated luminescence was used to determine the equivalent dose (De) for about 150 luminescent K-feldspar grains of two well-bleached aeolian sand samples, previously dated using quartz optically stimulated luminescence (OSL) and thermally-transferred OSL (TT-OSL). Fading tests were performed both on the entire single grain disc, using stimulation by IR LEDs, and on each grain individually, by stimulation with an IR laser. The single grain De distributions are highly over dispersed, even after applying rejection criteria, such as recycling ratio and recuperation. Fading rates determined with the IR LED stimulation do not represent the fading behavior of the IR laser stimulated signal and are therefore considered inappropriate for the fading correction of single grain De values. Fading rates of individual grains exhibit a wide range of values (0%–10% per decade) and plotting the single grain fading rates against the single grain De values reveals a negative relationship. Different approaches were taken to correct for fading, but the resulting ages tend to underestimate the reference ages. |
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