Comparison of single-grain and small-aliquot OSL dose estimates in < 3000 years old river sediments from South India

Publication: Research - peer-reviewJournal article – Annual report year: 2005

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We report on OSL dose distributions derived from small-aliquot and single grains of quartz in young fluvial sediments sampled from the Penner River basin, South India. The single-grain dose distributions suggest that 13 out of 19 samples were well bleached. In many well-bleached samples, there was an underestimation in the single-aliquot dose estimates as compared to those from the single grain-the difference between average dose estimates determined by the two methods ranged from similar to 1% to 31%. Such a dose underestimation was not detectable in poorly bleached samples. Various possible reasons for the discrepancy between single-grain and small-aliquot dose estimates are discussed. Although there is no satisfactory explanation for this discrepancy, we speculate that the difference in the stimulation wavelengths, 470 +/- 130 nm in the case of single-aliquot and 532 nm in the case of single grains, could perhaps be one of the reasons; this may occur because the stimulation wavelength affects the proportion of the medium and slow components in the initial signal. (c) 2004 Elsevier Ltd. All rights reserved.
Original languageEnglish
JournalRadiation Measurements
Issue number5
Pages (from-to)457-469
StatePublished - 2005
CitationsWeb of Science® Times Cited: 32
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ID: 6187067