Modeling incomplete and heterogeneous bleaching of mobile grains partially exposed to the light: Towards a new tool for single grain OSL dating of poorly bleached mortars

Guibert, Pierre; Christophe, Claire; Urbanová, Petra; Guérin, Guillaume; Blain, Sophie

doi:10.1016/j.radmeas.2017.10.003

Cited by 22 publications

(21 citation statements)

References 26 publications

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“…The further application of the MAM statistical method could greatly improve the accuracy of the experimental data. However, neither its application nor that of other statistical methods developed to obtain the best selection of the fully bleached grains (the internal-external consistency criterion, IEU, Thomsen et al 2007 or that recently proposed by Guibert et al 2017) could guarantee successful dating in a few of our previous case studies (Panzeri et al 2017).…”

Section: Discussionmentioning

confidence: 93%

Luminescence and Radiocarbon Dating of Mortars at Milano-Bicocca Laboratories

et al. 2020

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This work shows the results of optically stimulated luminescence (OSL) and radiocarbon (14C) dating applied to mortars of historical structures in northern Italy. All the results are compared with archaeological evidence and thermoluminescence (TL) dating of bricks. The main issue for OSL mortar dating is that the quartz grains contained in the mortar may be only partially bleached, leading to an overestimation of the sample age. In order to identify the best protocol to apply, both multi-grain (MG) and single grain (SG) methods were used. The minimum age model (MAM) statistical approach was applied to refine their accuracy. However, the identification of the bleached grains is not always successful, indicating that further investigations are needed to develop suitable dating protocol. For the 14C technique, a crucial aspect is the selection of anthropogenic calcite. In this work the mortars were treated using a Cryosonic method to select anthropogenic calcite from raw material, and the obtained powder was sieved to select the finer fraction. Unfortunately, only in two cases an acceptable amount of sample could be obtained. All the fractions were dated via accelerator mass spectrometry (AMS), and the results compared with independently obtained dates. The results show that the execution of the dating analysis requires previous characterizations to assess the nature of the mortar components and avoid unusable fractions.

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Section: Discussionmentioning

confidence: 93%

Luminescence and Radiocarbon Dating of Mortars at Milano-Bicocca Laboratories

et al. 2020

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“…In the following section, we review the definition of the exponential exposure distribution (EED) model (see Guibert et al 2017), and we will discuss in particular the physical significance of one of the most influent parameters, the so-called Kappa factor, Κ, that characterizes the degree of bleaching of a given sample.…”

Section: Physical Background and Implementation Of The Exponential Exmentioning

confidence: 99%

Modeling Light Exposure of Quartz Grains During Mortar Making: Consequences for Optically Stimulated Luminescence Dating

et al. 2020

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Dating lime mortar shows great potential for establishing the chronology of a construction. The basic premise of mortar dating by optically stimulated luminescence (OSL) is that quartz in the sand used for making mortar has been optically zeroed during the preparation process (optical bleaching). The moment to be dated is the last exposure of sand grains to light, before being embedded within the masonry and hidden from light. However, the main problem is the frequent partial and heterogeneous bleaching of grains, and this led us to use the single grain technique (SG-OSL) systematically. Some theoretical and experimental aspects of a new statistical treatment (the EED model, as exponential exposure distribution) are detailed and discussed. Our experience shows that SG-OSL dating of mortars is successful in a majority of situations. In a minority of cases (around 15%) difficulties originate when there is inappropriate OSL behavior of grains, and thus OSL dating is not possible. In the other cases, good agreement was obtained between OSL ages and the reference ones for a series of samples from a variety of ages and situations, even in the case of poorly bleached material. Anyway, the present situation of OSL dating methodology justifies the systematic use of SG-OSL in the dating of masonry today.

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“…Après une première phase de réflexion sur le traitement des données et de proposition à la fin des années 1990 (Galbraith et al, 1999), le travail théorique sur de nouveaux modèles statistiques plus adaptés à la physique des grains et des modalités de dépouillement continue aujourd'hui de se développer et même si les nouveaux outils ne sont pas encore complètement stabilisés, une bien meilleure compréhension des processus physiques, selon mon point de vue, est à portée de main (Christophe et al, 2018 ;Guérin et al, 2017 ;Guibert et al, 2017). Aujourd'hui, le gain qualitatif, c'est aussi la capacité de décider par des considérations intrinsèques à la méthode, à la vue de l'histogramme de distribution des doses, si l'échantillon a été globalement bien blanchi ou non et si la datation que nous pouvons proposer sera valide ou susceptible de « révision majeure ».…”

Section: Datation Par Le Déséquilibre Des Séries De L'uraniumunclassified

Dater, une histoire qui date !

Guibert¹

2018

archeosciences

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Nous tentons dans cet article de présenter l’évolution des méthodes physiques de datation au cours des dernières décennies en mettant en lumière les facteurs qui ont été à l’origine de cette évolution. Nous en présentons les conséquences sur la pratique de la datation et sur l’évolution des problématiques de la datation en archéologie. Ainsi, nous avons passé en revue trois types de méthodes selon le mode d’enregistrement du temps : 1) variations de paramètres environnementaux : dendrochronologie et archéomagnétisme ; 2) filiation radioactive : datation par les isotopes cosmogéniques, dont le radiocarbone, et datation par accumulation d’isotopes fils : potassium-40 et déséquilibre des séries de l’uranium (238U-234U-230Th) ; 3) accumulation de charges déplacées par l’irradiation : méthodes paléodosimétriques dont la datation par luminescence et par résonance paramagnétique électronique. Selon les cas, nous évoquons des défis pour les années futures.

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Modeling incomplete and heterogeneous bleaching of mobile grains partially exposed to the light: Towards a new tool for single grain OSL dating of poorly bleached mortars

Cited by 22 publications

References 26 publications

Luminescence and Radiocarbon Dating of Mortars at Milano-Bicocca Laboratories

Luminescence and Radiocarbon Dating of Mortars at Milano-Bicocca Laboratories

Modeling Light Exposure of Quartz Grains During Mortar Making: Consequences for Optically Stimulated Luminescence Dating

Dater, une histoire qui date !

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