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

Jakob Wallinga, Andrew Murray, Geoff Duller

Research output: Contribution to journalArticleAcademicpeer-review

121 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)691-695
Number of pages5
JournalRadiation Measurements
Issue number5
Publication statusPublished - 15 Dec 2000
Externally publishedYes
EventProceedings of the 9th International Conference on Luminescence and Electron-Spin Resonance Dating (LED99) - Rome, Italy
Duration: 6 Sep 199910 Sep 1999

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