New luminescence measurement facilities in retrospective dosimetry

Lapp, Torben; Jain, Mayank; Thomsen, Kristina Jørkov; Murray, Andrew; Buylaert, Jan‐Pieter

doi:10.1016/j.radmeas.2012.02.006

Cited by 49 publications

(37 citation statements)

References 19 publications

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“…The spatial homogeneity of the 90 Sr/ 90 Y beta source (ID 155, produced prior to 2000) used for the single grain measurements presented here was determined using radiochromic film (GAFCHROMIC EBT2) and the coefficient of variation was found to be ~5%, which is unlikely to affect our dose distributions significantly. Using the approach developed by Lapp et al (2012) to correct for spatial beta source heterogeneity, no significant changes in dose or scatter in our dose distributions could be detected, which is consistent with the observations of Sim et al (2014) for the same source. Thus, the laboratory beta dose rate employed in further single grain calculations is based on the average over the whole disc.…”

Section: Quartz Single Grain Oslsupporting

confidence: 87%

The complementarity of luminescence dating methods illustrated on the Mousterian sequence of the Roc de Marsal: A series of reindeer-dominated, Quina Mousterian layers dated to MIS 3

Guérin

Frouin

Tuquoi

et al. 2017

Quaternary International

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Located in southwest France, Roc de Marsal is a cave with a rich Mousterian stratigraphic sequence. The lower part of the sequence (Layers 9-5) are characterized by assemblages dominated by Levallois lithic technology associated with composite faunal spectra (including red deer, roe deer and reindeer) that shows a gradual increase in the frequency of reindeer. The top of the sequence (Layers 4-2) are characterised instead by Quina lithic technology (both in terms of technology and typology) with the faunal remains dominated by reindeer. Roc de Marsal thus provides a very interesting case study to place behavioural changes in a context of changing climates and environments in western Europe during the late Pleistocene. To link the occupations at Roc de Marsal with global and regional climatic conditions known independently, a robust chronology is needed. With this aim in mind, we applied three luminescence dating methods (TL, OSL and IRSL) on different minerals (flint, quartz and K-feldspar extracts). Here the results of two of these methods are presented in detail (TL and OSL) and compared with preliminary IRSL data. At Roc de Marsal, a comparison of methods was necessary to overcome a complex sedimentary history, with very heterogeneous dose rate distributions, both at the beta (mm) and gamma (dm) dose rate scales. The results indicate that the lower Levallois layers are dated to ~65-70 ka, while overlying Quina layers are dated to ~49 ka. These ages for the lower layers fit well with some models that place mixed faunal assemblages in the initial MIS 4; however, while the Quina ages overlap with several other Quina assemblages from the region, they place the reindeer dominated fauna well after the peak cold of MIS 4 and suggest a more extended and complex period of contemporaneous lithic techno-complexes than posited by some current models. AbstractLocated in southwest France, Roc de Marsal is a cave with a rich Mousterian stratigraphic sequence. The lower part of the sequence (Layers 9-5) are characterized by assemblages dominated by Levallois lithic technology associated with composite faunal spectra (including red deer, roe deer and reindeer) that shows a gradual increase in the frequency of reindeer. The top of the sequence (Layers 4-2) are characterised instead by Quina lithic technology (both in terms of technology and typology) with the faunal remains dominated by reindeer. Roc de Marsal thus provides a very interesting case study to place behavioural changes in a context of changing climates and environments in western Europe during the late Pleistocene. To link the occupations at Roc de Marsal with global and regional climatic conditions known independently, a robust chronology is needed. With this aim in mind, we applied three luminescence dating methods (TL, OSL and IRSL) on different minerals (flint, quartz and K-feldspar extracts). Here the results of two of these methods are presented in detail (TL and OSL) and compared with preliminary IRSL data. At Roc de Marsal, a comparison of metho...

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Section: Quartz Single Grain Oslsupporting

confidence: 87%

The complementarity of luminescence dating methods illustrated on the Mousterian sequence of the Roc de Marsal: A series of reindeer-dominated, Quina Mousterian layers dated to MIS 3

Guérin

Frouin

Tuquoi

et al. 2017

Quaternary International

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“…Mapping the beta source following the approach of Lapp et al (2012) 435 showed that the effective dose rate varied spatially by up to 5% and 13% for the 436 sources ID155 and ID195, respectively. Lapp et al (2012) have developed software 437 that makes it possible to correct for this dose rate inhomogeneity automatically using 438 this dose-rate map. This source inhomogeneity contributes to the intrinsic over-439 18 dispersion discussed in the previous section; the size of this contribution can be 440 determined by analysing a bleached and gamma dosed sample with and without 441 correction for inhomogeneity.…”

Section: Effect Of Beta Source Inhomogeneity 424mentioning

confidence: 99%

Reliability of equivalent-dose determination and age-models in the OSL dating of historical and modern palaeoflood sediments

Medialdea

Thomsen

Murray

et al. 2014

Quaternary Geochronology

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G. (2014). Reliability of equivalent-dose determination and age-models in the OSL dating of historical and modern palaeoflood sediments. Quaternary Geochronology, 22, 11-24. DOI: 10.1016/j.quageo.2014 Elsevier Editorial System(tm) for Quaternary Geochronology Manuscript DraftManuscript Number: QUAGEO-D-12-00096R1Title: Reliability of equivalent-dose determination and age-models in the OSL dating of historical and modern palaeoflood sediments Abstract: The challenge of accurately estimating the deposition age of incompletely-bleached samples in luminescence dating has motivated developments in the analysis of single grain dose distributions, and a number of statistical approaches have been proposed over the last few years. In this study, we compare the behaviour of the arithmetic average, the so-called 'robust statistics', the Central Age Model (CAM), the Minimum Age Model (MAM) and the Internal-External Consistency Criterion (IEU), when applied to single-grain and small multi-grain (~30 grains per aliquot) dose distributions from a sequence of eight recent (40-1000 years old) flash-flood deposits. These sediments are expected to be incompletely bleached, but all have age control from historical records. Modifications were made to allow the use of the standard CAM and MAM models with dose distributions containing near zero and negative dose values. An assessment of minimum uncertainty on individual dose estimates is based on the over-dispersion (OD) determined in dose recovery tests making use of gamma-irradiated samples. We then present a detailed analysis of the impact of appropriate uncertainty assignment on minimum (MAM and IEU) burial dose estimates. The results of the various models are discussed in terms of the accuracy of the resulting age, and we conclude that, overall, the IEU approach generates the most accurate ages. We also demonstrate that accurate IEU ages can be obtained from multi-grain measurements if an age off-set of ~40 years can be considered to be unimportant for the samples in question. From our study we conclude that these and similar young slack-water flood deposits can be accurately dated using quartz OSL, opening up the possibility of establishing time series of flood discharge in catchments for which no instrumental or historical record exists. 1Reliability of equivalent-dose determination and age-models in the OSL dating of 1 historical and modern palaeoflood sediments 2 3 Medialdea 1,3 , A., Thomsen 2 , K.J., Murray 3 , A.S., Benito 1 , G. 41. Museo Nacional de Ciencias Naturales, CSIC, Serrano 115bis, 28006 Madrid, 5Spain. amedialdea@mncn.csic.es 6 2. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø 7Campus, Frederiksborgvej 399, 4000 Roskilde, Denmark. The challenge of accurately estimating the deposition age of incompletely-bleached 13 samples in luminescence dating has motivated developments in the analysis of 14 single grain dose distributions, and a number of statistical approaches have been 15proposed over the last few years. In this study, we comp...

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“…The β-source in the single grain reader has been checked for inhomogeneity of its irradiation field, as this can be of importance for the single grain measurements. Applying the method proposed by Lapp et al (2012) using a β-radiation sensitive self-developing film it was concluded that non-uniformity of the β-source is minor and hence no correction on the single grains measurements was applied.…”

Section: Equipment and Equivalent Dose Determinationmentioning

confidence: 99%

Performance of different luminescence approaches for the dating of known-age glaciofluvial deposits from northern Switzerland

2013

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Luminescence properties of two samples taken from sand lenses in proglacial outwash deposits of a piedmont glacier that reached the Swiss midlands during the Last Glacial Maximum are investigated in detail. Deconvolution of CW-OSL decay curves shows that the fast component dominates the OSL signal of quartz. The chemistry of single feldspar grains, in particular the K content in different grains, is determined using wavelength dispersive spectrometry (electron microprobe), revealing an average 12.9 wt.% K of the grains contributing to the IRSL signal. D e distributions are investigated in order to gain insights into partial bleaching, and agreement is found for quartz OSL and feldspar IR 50 and pIRIR 225 ages for small aliquots and single grains when applying the Minimum Age Model. These ages are also consistent with independent age control. For one sample, ages determined using the Central Age Model result in highly overestimated ages for both feldspar and quartz.

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New luminescence measurement facilities in retrospective dosimetry

Cited by 49 publications

References 19 publications

The complementarity of luminescence dating methods illustrated on the Mousterian sequence of the Roc de Marsal: A series of reindeer-dominated, Quina Mousterian layers dated to MIS 3

The complementarity of luminescence dating methods illustrated on the Mousterian sequence of the Roc de Marsal: A series of reindeer-dominated, Quina Mousterian layers dated to MIS 3

Reliability of equivalent-dose determination and age-models in the OSL dating of historical and modern palaeoflood sediments

Performance of different luminescence approaches for the dating of known-age glaciofluvial deposits from northern Switzerland

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