The single aliquot regenerative dose protocol: potential for improvements in reliability

Murray, A.S.; Wintle, A.G.

doi:10.1016/s1350-4487(03)00053-2

Cited by 1,879 publications

(938 citation statements)

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“…In our protocol, natural and regenerated signals were measured after a preheat of 10 s at 220 C; the corresponding OSL responses to a test dose (17 Gy) were measured after a cutheat (ramp heating) to 180 C. The value of the test dose (17 Gy) was kept constant through all measurements for all grain sizes of quartz in order to facilitate the direct comparison of the dose response curves. A high-temperature bleach was performed by stimulating with the blue diodes for 40 s at 280 C (Murray and Wintle, 2003).…”

Section: Samples Instrumentation and Measurement Protocolmentioning

confidence: 99%

“…Each aliquot considered in the analysis successfully passed recycling (Murray and Wintle, 2003) and IR depletion ratio tests (Duller, 2003).…”

Section: Referencementioning

confidence: 99%

“…A series of investigations carried out using the SAR measurement procedure (Murray and Wintle, 2003) on the quartz OSL signal from different grain sizes extracted from Romanian (TimarGabor et al, 2011(TimarGabor et al, , 2012Timar-Gabor and Wintle, 2013;Constantin et al, 2014) and Serbian loess yielded intriguing results. The optical ages obtained on fine-sand sized quartz grains (63e90 mm) were reported to be systematically higher than those for silt-sized quartz grains (4e11 mm) for ages >~40 ka.…”

Section: Introductionmentioning

confidence: 99%

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On the importance of grain size in luminescence dating using quartz

Timar-Gabor

Buylaert

Guralnik

et al. 2017

Radiation Measurements

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h i g h l i g h t sDiscrepancy between quartz SAR-OSL ages obtained on fine and coarse grains. Dose response curve adequately fitted by a sum of two saturating exponentials. Isothermal decay fitted by a single exponential. Clear dependency between the saturation characteristics (D 0 s) and the quartz grain size. No correlation between the 2 D 0 value and the maximum attainable accurate equivalent dose. a r t i c l e i n f o a b s t r a c tThere are two major problems commonly encountered when applying Optically Stimulated Luminescence (OSL) dating in the high dose range: (i) age discrepancy between different grain sizes, and (ii) age underestimation. A marked and systematic discrepancy between fine-grain (4e11 mm) and coarse-grain (63e90 mm) quartz single aliquot regeneration protocol (SAR) ages has been reported previously for Romanian and Serbian loess >40 ka (D e of~100 Gy), generally with fine-grain ages underestimating the depositional age. In this paper, we show a similar age pattern for two grain size fractions from Chinese loess, thus pointing to a potential worldwide phenomenon. While age underestimation is often attributed to signal saturation problems, this is not the case for fine grain material, which saturates at higher doses than coarse grains, yet begins to underestimate true ages earlier. Here we examine the dose response curves of quartz from different sedimentary contexts around the world, using a range of grain sizes (diameters of 4e11 mm, 11e30 mm, 35e50 mm, 63e90 mm, 90e125 mm, 125e180 mm, and 180 e250 mm). All dose response curves can be adequately described by a sum of two saturating exponential functions, whose saturation characteristics (D 0 values) are clearly anticorrelated with grain diameter (4) through an inverse square root relationship, D 0 ¼ A/√4, where A is a scaling factor. While the mechanism behind this grain-size dependency of saturation characteristics still needs to be understood, our results show that the observation of an extended SAR laboratory dose response curve does not necessarily enable high doses to be recorded accurately, or provide a corresponding extended age range.

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Section: Samples Instrumentation and Measurement Protocolmentioning

confidence: 99%

“…Each aliquot considered in the analysis successfully passed recycling (Murray and Wintle, 2003) and IR depletion ratio tests (Duller, 2003).…”

Section: Referencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the importance of grain size in luminescence dating using quartz

Timar-Gabor

Buylaert

Guralnik

et al. 2017

Radiation Measurements

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“…The single-aliquot regenerative-dose approach (SAR) was used for all measurements (cf. Murray and Wintle, 2003). Preheat temperatures between 180 and 280°C for 10 s, a cut heat temperature of 20°C below the preheat temperature and OSL stimulation for 50 s at 125°C were employed for the preheat plateau test (C-L2896, C-L2900) and the dose recovery experiment (given doses of 68 Gy (C-L2896) and 82 Gy (C-L2900) 1 mm, 5 aliquots for each temperature).…”

Section: Luminescence Datingmentioning

confidence: 99%

Luminescence dating of loess deposits from the Remagen-Schwalbenberg site, Western Germany

et al. 2015

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This study describes the luminescence characteristics of quartz of Upper Pleistocene loess of the Middle Rhine area. The loess/palaeosol sequence of the Schwalbenberg near Remagen comprises a multitude of interstadial soils and soil sediments that have been dedicated to the Marine Isotope Stage 3 (MIS 3). These weak calcaric cambisols and their derivates are underlain by loess and soil sediments of MIS 4 to MIS 5 and covered by loess sediments and intercalated gelic gleysols of MIS 2. We applied luminescence dating of quartz and feldspar of drill core samples and observed an age discrepancy within both data sets. The quartz ages were clearly younger than the feldspar ages, because of thermally unstable signal components of the quartz luminescence signal. Therefore, we regarded the quartz samples of the lower parts of the drill core as unsuitable for luminescence dating. This underestimation did not affect the quartz samples of the upper part of the drill core which was indicated by age control that was provided by the Eltville tephra layer. Geochemical analysis based on X-ray fluorescence showed that the sediments in the upper part and the lower part of the drill core have different geogenic finger prints most likely due to changing source areas of dust and sediment allocation. We assumed that these different facies types were the reason for the luminescence behavior of the quartz samples.

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“…Five of the samples were collected at different depths of a vertical profile to provide an indication of the rate of ridge emplacement; three sediment samples from 2 m depth were taken from ridges 5, 10 and 15 and two further sediment samples from 3 m depth were taken from ridges 10 and 15. Each sample was measured for luminescence using twelve multigrain single aliquots of 180-212 mm quartz grains, adopting a single aliquot regenerative-dose (SAR) protocol (Murray and Wintle, 2003). The samples were assessed initially using a preliminary procedure to determine infrared stimulated luminescence (IRSL) contamination, signal sensitivity, approximate equivalent dose (De), and an indication of the degree of inter-aliquot variability.…”

Section: Osl Analysismentioning

confidence: 99%