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Extensive survey on radiocarbon dating of organic inclusions in historical mortars

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    SYSNO ASEP0568915
    Document TypeA - Abstract
    R&D Document TypeO - Ostatní
    TitleExtensive 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, SAI
    Article numberA03_P10
    Source Title24th Radiocarbon Conference. 10th 14C & Archaeology Conference. Zurich, 11-16 September 2022. Book of abstracts. - Zurich : ETH Zurich, 2022 - ISBN N
    Number of pages1 s.
    Publication formOnline - E
    ActionRadiocarbon Conference /24./ 14C & Archaeology Conference /10./
    Event date11.09.2022 - 16.09.2022
    VEvent locationZurich
    CountryCH - Switzerland
    Event typeWRD
    Languageeng - English
    CountryCH - Switzerland
    Keywordsradiocarbon dating ; charcoals ; mass spectrometry
    OECD categoryAnalytical chemistry
    R&D ProjectsEF16_019/0000728 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
    GB14-36938G GA ČR - Czech Science Foundation (CSF)
    Institutional supportUJF-V - RVO:61389005 ; UTAM-F - RVO:68378297
    AnnotationDirect 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.
    WorkplaceNuclear Physics Institute
    ContactMarkéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228
    Year of Publishing2023
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