Towards quantifying beta microdosimetric effects in single-grain quartz dose distribution

Mayya, Y. S.; Morthekai, P.; Murari, Madhav K.; Singhvi, A. K.

doi:10.1016/j.radmeas.2006.08.004

Cited by 168 publications

(117 citation statements)

References 18 publications

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“…On the other hand, Mayya et al (2006) and Guérin et al (2015a) have shown that dose rate variations at the mm-scale, for example due to the presence of potassium feldspar grains, can lead to continuous D e distributions with arbitrarily large OD values. Fig.…”

Section: Results: Compared Single-grain Agesmentioning

confidence: 99%

Testing the accuracy of a Bayesian central-dose model for single-grain OSL, using known-age samples

Guérin

Combès

Lahaye

et al. 2015

Radiation Measurements

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While reviews of comparisons between multi-grain OSL ages and independent chronological information are available in the literature, there is hardly any such performance test for single-grain OSL ages. And yet, this is all the more needed as the interpretation of single-grain dose distributions remains a difficult task, given the typically considerable dispersion in equivalent dose values measured by OSL -and the numerous sources of such dispersion in measurements. In this study, we present the OSL study of 19 samples for which independent age control is available, and whose ages range from 2 to 46 ka. Based on multi-grain OSL age estimates, these samples are presumed to have been both well-bleached at burial, and unaffected by mixing after deposition. Two ways of estimating single-grain ages are then compared: the standard approach on the one hand, consisting of applying the Central Age Model to D e values determined with the Analyst software; on the other hand, the central dose model recently proposed by Combès et al. (Combès, B., Philippe, A., Lanos, P., Mercier, N., Tribolo, C., Guerin, G., Guibert, P., Lahaye, C., in press. Quaternary Geochronology). The median of the relative discrepancy between single-grain OSL and reference ages is about twice as large for the standard approach (12%) than with the Bayesian model (7%). Statistical tests show that, based on our (limited) data set, the difference between the two models seems to be significant for samples in the age range 4-46 ka. Finally, the influence of various factors on the (in-)accuracy of single grain OSL ages is discussed; it appears that the accuracy of ages estimated in a standard way decreases when age is increased, while the Bayesian model seems more robust. This study also shows that (i) there is no 20 % limit on the CAM overdispersion parameter for well-bleached samples; (ii) dose recovery experiments do not seem to be a very reliable tool to estimate the accuracy of a SAR measurement protocol for age determination. Highlights-Samples with independent age control are dated by OSL -Their ages range from 2 to 46 ka -Multi-grain OSL ages indicate no bleaching/mixing problem -Single-grain OSL is analysed using two different models -A Bayesian approach is expected to lead to improved accuracy

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Section: Results: Compared Single-grain Agesmentioning

confidence: 99%

Testing the accuracy of a Bayesian central-dose model for single-grain OSL, using known-age samples

Guérin

Combès

Lahaye

et al. 2015

Radiation Measurements

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show abstract

“…Numerous studies using small or singlegrain aliquots have suggested that heterogeneity in the dose contribution of the sediment, particularly in the beta dose, can produce variability in measured De values (e.g. Olley et al, 1997;Murray and Roberts, 1997;Kalchgruber et al, 2003;Nathan et al, 2003;Vandenberghe et al, 2003;Mayya et al, 2006). The small number of samples collected from sand lenses in alluvial fan deposits in this study makes meaningful statistical comparison with samples from the more poorly sorted sheetflood deposits difficult.…”

Section: Insert Table 2 Herementioning

confidence: 89%

Luminescence dating without sand lenses: An application of OSL to coarse-grained alluvial fan deposits of the Lost River Range, Idaho, USA

Kenworthy¹,

Rittenour²,

Pierce³

et al. 2014

Quaternary Geochronology

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“…Therefore, quartz grains in proximity to these hot spots would have received a higher dose rate and, thus, accumulated dose faster than other grains. Mayya et al (2006) have shown that beta dose inhomogeneity will cause positively skewed D e distributions and suggest to use a minimum dose concept for D e analyses. For the sediments investigated here, beta dose inhomogeneity is presumably mainly related to mud-pellets rich in clay (and hence K), whereas detrital zircon as mainly strong alpha emitter will have only a minor effect, as the outer part of the quartz grains has been removed by etching.…”

Section: Discussionmentioning

confidence: 99%

Refining late Quaternary plunge pool chronologies in Australia's monsoonal 'Top End'

May

Preusser

Gliganic

2015

Quaternary Geochronology

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Plunge pool deposits from Australia's 'Top End' are considered as important archives of past monsoonal activity in the region. The available chronology of these deposits was so far based on thermoluminescence (TL) dating and indicated maximum flood magnitudes during the Last Glacial Maximum in contrast with more arid conditions as deduced from other archives of the region. This study revisits plunge pool deposits at Wangi Falls by applying multiple and single-grain Optically Stimulated Luminescence (OSL) dating of quartz and high-resolution gamma spectrometry, supported by radiocarbon dating of organic material. The aim is to reappraise the existing chronology and investigate if the deposits are affected by partial bleaching, postdepositional mixing and/or problems related to annual dose determination. The latter seems to have a minor impact on the ages at most. Equivalent Dose (De) distributions are broad, in particular for single grains, but apparently not result from partial bleaching or post-depositional mixing. Rather, microdosimetry caused by radiation hotspots in the sediment and zircon inclusions in the quartz grains is considered problematic for these sediments. The results presented here imply that the previous TL chronology overestimated the real deposition age of the sediments. Disciplines Medicine and Health Sciences | Social and Behavioral Sciences AbstractPlunge pool deposits from Australia's 'Top End' are considered as important archives of past monsoonal activity in the region. The available chronology of these deposits was so far based on thermoluminescence (TL) dating and indicated maximum flood magnitudes during the Last Glacial Maximum in contrast with more arid conditions as deduced from other archives of the region. This study revisits plunge pool deposits at Wangi Falls by applying multiple and single-grain Optically Stimulated Luminescence (OSL) dating of quartz and high-resolution gamma spectrometry, supported by radiocarbon dating of organic material. The aim is to reappraise the existing chronology and investigate if the deposits are affected by partial bleaching, post-depositional mixing and/or problems related to annual dose determination. The latter seems to have a minor impact on 2 the ages at most. Equivalent Dose (D e ) distributions are broad, in particular for single grains, but apparently not result from partial bleaching or post-depositional mixing. Rather, microdosimetry caused by radiation hotspots in the sediment and zircon inclusions in the quartz grains is considered problematic for these sediments. The results presented here imply that the previous TL chronology overestimated the real deposition age of the sediments.

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Towards quantifying beta microdosimetric effects in single-grain quartz dose distribution

Cited by 168 publications

References 18 publications

Testing the accuracy of a Bayesian central-dose model for single-grain OSL, using known-age samples

Testing the accuracy of a Bayesian central-dose model for single-grain OSL, using known-age samples

Luminescence dating without sand lenses: An application of OSL to coarse-grained alluvial fan deposits of the Lost River Range, Idaho, USA

Refining late Quaternary plunge pool chronologies in Australia's monsoonal 'Top End'

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