Datation par le carbone 14 de charbons de bois inclus dans un moule en plâtre du fonds Palissy

Nous avons daté par radiocarbone plusieurs petits fragments de charbon de bois, qui étaient inclus dans un moule en plâtre du fonds Palissy conservé au musée national de la Renaissance à Écouen. Le défi était double : la taille extrêmement petite des échantillons et la rareté des résultats de datation sur les charbons de bois inclus dans des plâtres. L’un des deux échantillons prélevés a permis de réaliser deux mesures. Les deux âges radiocarbone obtenus ont été combinés et la valeur calculée est : 488±22 ans BP, soit une date comprise dans l’intervalle 1410-1445 apr. J.-C.Cette étude nous a permis de discuter de la faisabilité (préparation de l’échantillon, mesure et calibration de la date) et de la pertinence de la datation par le carbone 14 de très petits fragments de bois ou de charbon de bois, qui seraient a priori de la période Renaissance.Small pieces of charcoal, inserted into a plaster mold from the Palissy’s collection and kept at the national museum of Renaissance at Écouen, were submitted to radiocarbon dating. The challenge was twofold: their extremely small sample sizes and the rather rare dating results on charcoal inserted in plaster. Two measurements were done on one of the two samples taken. The radiocarbon ages were combined and the calculated value is: 488±22 years BP, which corresponds to a calibrated date between 1410 and 1445 AD.This study enabled us to discuss the feasibility (sample preparation, measurement and calibration of date) and the relevance of carbon 14 dating for very small pieces of wood or charcoal, which would be a priori of the Renaissance period

Datation par le carbone 14 et restes humains

Cet article présente la datation par le carbone 14, appliquée à différents échantillons (textiles, végétaux, cheveux) prélevés sur la momie égyptienne dorée conservée au musée de Dunkerque. Les résultats illustrent bien et permettent de valider les protocoles de préparation des échantillons pour la datation : de l’étape d’extraction des matières organiques exogènes à celle de la kératine des cheveux. En effet, ces protocoles doivent être rigoureusement contrôlés, car ils sont essentiels à l’obtention de résultats fiables et reproductibles.This article presents the radiocarbon dating applied on different samples (textiles, plants, hair) taken on the golden Egyptian mummy, preserved in the museum of Dunkerque, France. The results illustrate and validate the sample preparation protocols used: from the extraction steps of exogenous organic matter to those of the hair keratin. Indeed, these protocols must be strictly controlled, because they are essential to obtain reliable and reproducible results

À propos de l’emploi de la datation par le carbone 14 dans l’étude des corans anciens : le cas du Codex Amrensis 22

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Annexe D : Datation par le carbone-14 de charbons de bois de petite taille

Richardin Pascale, Gandolfo Nathalie. Annexe D : Datation par le carbone-14 de charbons de bois de petite taille. In: Le Petit Paulmy, Abilly (Indre-et-Loire). Un habitat du néolithique final de la région pressignienne. Tours : Fédération pour l'édition de la Revue archéologique du Centre de la France, 2013. pp. 505-511. (Supplément à la Revue archéologique du centre de la France, 46

Étude des rapports anatomiques entre rachis cervical et base du crâne sur une série de têtes de momies égyptiennes (Collection du Musée des Confluences de Lyon)

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Le Grand Khorasan : Datation par des méthodes physico-chimiques (carbone 14 et luminescence)

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Cats, Crocodiles, Cattle, and More: Initial Steps Toward Establishing a Chronology of Ancient Egyptian Animal Mummies

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First direct radiocarbon dating of the lower Congo rock art (Democratic Republic of the Congo)

Lower Congo rock art is concentrated in a region that stretches from Kinshasa to the Atlantic coast and from northern Angola to southern Congo-Brazzaville. Although Lower Congo rock art was identified as early as the 19th century, it had never been a subject of thorough investigation. Presently inhabited by the Ndibu, one of the Kongo subgroups, the Lovo Massif is situated north of the ancient Kongo Kingdom. With 102 sites (including 16 decorated caves), the massif has the largest concentration of rock art in the entire region. In 2008 and 2010, we were able to collect pigment samples directly on the panels of the newly discovered decorated cave of Tovo. Unlike the Sahara and southern Africa, both extensively prospected, rock art of central Africa is still widely unknown and not dated. Radiocarbon dating of rock art in Africa is a real challenge and only a few direct dates have been obtained thus far. After verifying that the pigment samples were indeed charcoal, we proceeded to 14C date them using accelerator mass spectrometry (AMS). The results indicate dates between cal AD 1480 and 1800, confirming that the occupation of Tovo Cave was contemporaneous with the ancient Kongo Kingdom. © 2013 by the Arizona Board of Regents on behalf of the University of Arizona.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

The "forest" of Notre-Dame de Paris: A possible path into medieval climate and time

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Omics for Precious Rare Biosamples: Characterization of Ancient Human Hair by a Proteomic Approach

International audienceOmics technologies have far-reaching applications beyond clinical medicine. A case in point is the analysis of ancient hair samples. Indeed, hair is an important biological indicator that has become a material of choice in archeometry to study the ancient civilizations and their environment. Current characterization of ancient hair is based on elemental and structural analyses, but only few studies have focused on the molecular aspects of ancient hair proteins–keratins–and their conservation state. In such cases, applied extraction protocols require large amounts of raw hair, from 30 to 100 mg. In the present study, we report an optimized new proteomic approach to accurately identify archeological hair proteins, and assess their preservation state, while using a minimum of raw material. Testing and adaptation of three protocols and of nano liquid chromatography–tandem mass spectrometry (nanoLC-MS/MS) parameters were performed on modern hair. On the basis of mass spectrometry data quality, and of the required initial sample amount, the most promising workflow was selected and applied to an ancient archeological sample, dated to about 3880 years before present. Finally, and importantly, we were able to identify 11 ancient hair proteins and to visualize the preservation state of mummy's hair from only 500 μg of raw material. The results presented here pave the way for new insights into the understanding of hair protein alteration processes such as those due to aging and ecological exposures. This work could enable omics scientists to apply a proteomic approach to precious and rare samples, not only in the context of archeometrical studies but also for future applications that would require the use of very small amounts of sample