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- W239519783 abstract "Non-hydraulic mortars contain datable binder carbonate with a direct relation to the time when it was used in a building, but they also contain contaminants that disturb radiocarbon dating attempts. The most relevant contaminants either have a geological provenance and age or they can be related to delayed carbonate formation or devitrification and recrystallization of the mortar. We studied the mortars using cathodoluminescence (CL), mass spectrometry (MS), and accelerator mass spectrometry (AMS) in order to identify, characterize, and date different generations of carbonates. The parameters—dissolution rate, 13 C/ 12 C and 18 O/ 16 O ratios, and 14 C age—were measured or calculated from experiments where the mortars were dissolved in phosphoric acid and each successive CO 2 increment was collected, analyzed, and dated. Consequently, mortar dating comprises a CL characterization of the sample and a CO 2 evolution pressure curve, a 14 C age, and stable isotope profiles from at least 5 successive dissolution increments representing nearly total dissolution. The data is used for modeling the interfering effects of the different carbonates on the binder carbonate age. The models help us to interpret the 14 C age profiles and identify CO 2 increments that are as uncontaminated as possible. The dating method was implemented on medieval and younger mortars from churches in the Åland Archipelago between Finland and Sweden. The results are used to develop the method for a more general and international use." @default.
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- W239519783 date "2007-01-01" @default.
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- W239519783 title "Mortar Dating Using AMS <sup>14</sup>C and Sequential Dissolution: Examples from Medieval, Non-Hydraulic Lime Mortars from the Åland Islands, SW Finland" @default.
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- W239519783 doi "https://doi.org/10.1017/s0033822200041898" @default.
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