Underestimation of equivalent dose in single-aliquot optical dating of feldspars caused by preheating

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Type Article
Original languageEnglish
Pages (from-to)691-695
Number of pages5
JournalRadiation Measurements
Volume32
Issue number5-6
Early online date16 Aug 2000
DOI
Publication statusPublished - 15 Dec 2000
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Abstract

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.

Keywords

  • optical dating, Feldspar, single aliquot, dose estimation, age underestimation