|Title||Zeroing of the OSL signal as a function of grain size : Investigating bleaching and thermal transfer for a young fluvial sample|
|Author(s)||Truelsen, Jimi L.; Wallinga, Jakob|
|Source||Geochronometria 22 (2003). - ISSN 1733-8387 - p. 1 - 8.|
|Publication type||Refereed Article in a scientific journal|
|Keyword(s)||Fluvial - Grain Size - Optical Dating - Poor Bleaching - Quartz|
Previous studies have indicated that the OSL signal from coarser grain-size fractions might be more completely reset during fluvial transport. In this study we investigate whether this feature is real, or rather an artefact of thermal transfer effects that might affect finer grains more due to smaller thermal lag during heat treatment. Our experimental results obtained on three grain-size fractions (90-125, 180-212 and 425-500 µm) clearly show that better bleaching of coarser grains is not caused by differences in thermal transfer. On the basis of our results we advise selecting a coarse grain size for analysis when dating young fluvial deposits.