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Words of warning about radiocarbon dating medieval human bones
Radiocarbon dating of human bones can be problematic due to the reservoir effect, occurring in samples with an aquatic food component. This is often the case for medieval monastic human bones. Here we analysed bone material from 27 Danish monastic burials showing elevated contents of the isotope 15N, indicating freshwater fish consumption. This potentially leads to radiocarbon ages appearing anomalously old - sometimes even predating the erection of the convent.
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