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Extensive survey on radiocarbon dating of organic inclusions in historical mortars
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SYSNO ASEP 0568915 Document Type A - Abstract R&D Document Type O - Ostatní Title Extensive survey on radiocarbon dating of organic inclusions in historical mortars Author(s) Pachnerová Brabcová, Kateřina (UJF-V) RID, ORCID, SAI
Kundrát, Pavel (UJF-V) RID, ORCID, SAI
Krofta, Tomáš (UJF-V) ORCID, SAI
Suchý, Václav (UJF-V) ORCID, SAI, RID
Petrová, Markéta (UJF-V) ORCID
John, David (UJF-V) ORCID, RID, SAI
Kozlovcev, Petr (UTAM-F) SAI, ORCID, RID
Kotková, Kristýna (UTAM-F) ORCID, RID, SAI
Fialová, Anna (UTAM-F) SAI, RID
Válek, Jan (UTAM-F) ORCID, SAI, RID
Světlík, Ivo (UJF-V) RID, ORCID, SAIArticle number A03_P10 Source Title 24th Radiocarbon Conference. 10th 14C & Archaeology Conference. Zurich, 11-16 September 2022. Book of abstracts. - Zurich : ETH Zurich, 2022 - ISBN N Number of pages 1 s. Publication form Online - E Action Radiocarbon Conference /24./ 14C & Archaeology Conference /10./ Event date 11.09.2022 - 16.09.2022 VEvent location Zurich Country CH - Switzerland Event type WRD Language eng - English Country CH - Switzerland Keywords radiocarbon dating ; charcoals ; mass spectrometry OECD category Analytical chemistry R&D Projects EF16_019/0000728 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GB14-36938G GA ČR - Czech Science Foundation (CSF) Institutional support UJF-V - RVO:61389005 ; UTAM-F - RVO:68378297 Annotation Direct radiocarbon dating of historical mortars remains challenging due to complex processes during mortar maturation that can mislead the interpretation. Organic inclusions in the mortars, such as charcoals, seeds, microbiotas, wood, or bones, represent important alternative or complementary dating material providing the date as a terminus post quem. This work adds to the determination of how reliable such organic inclusions can be for radiocarbon dating. For the analysis, we have collected 129 charcoals from five different early to late medieval castles and churches located throughout the Czech Republic. The architectural objects were chosen to meet the following criteria: i) known age documented in written sources and optimally also obtained through other dating method or complemented with radiocarbon dating of samples other than mortar‐derived ones - ii) known history of repairs and maintenance - iii) age falling before 1650 AD to avoid issues related to inconclusive radiocarbon dating in the early modern period.
Most of the samples were measured on our new AMS MILEA. The results demonstrate that a notable fraction of inclusions corresponds to charcoals from old wood, often a few hundred years old when raising the object, presumably originating from timber cut‐offs. For some sites we found several samples related to later repairs, despite trying to limit the sampling areas to original masonry only. Based on this comprehensive study, we recommend a rather high number of samples be collected per dated object, at least 5 ‐ 10 for sites with uncomplicated building history, so that radiocarbon dating provides reliable results.Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2023
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