Journal
RADIATION MEASUREMENTS
Volume 32, Issue 5-6, Pages 691-695Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S1350-4487(00)00127-X
Keywords
optical dating; feldspar; single aliquot; dose estimation; age underestimation
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The ability of single-aliquot techniques to recover a known Laboratory dose in coarse-grain potassium-rich feldspar separates is tested. It is shown that, for the samples under study, single-aliquot methods underestimate the known dose. It is deduced that this phenomenon is caused by an increase in electron trapping probability as a consequence of heating. The same phenomenon would lead to an underestimation in the equivalent dose in a natural sample. Multiple-aliquot techniques for equivalent dose determination may not suffer from this problem, but are not suitable for samples that might not have been completely bleached at the time, of deposition. it is argued that testing for changes in electron trapping probability should become routine practice in the single-aliquot dating of feldspar. (C) 2000 Elsevier Science Ltd. All rights reserved.
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