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      BCal: an on-line Bayesian radiocarbon calibration tool

      , ,
      Internet Archaeology
      Council for British Archaeology

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          Abstract

          This paper describes newly launched software for on-line Bayesian calibration of archaeological radiocarbon determinations. The software is known as BCal and members of the world-wide archaeological research community are invited to use it should they so wish.

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          INTCAL98 Radiocarbon Age Calibration, 24,000–0 cal BP

          The focus of this paper is the conversion of radiocarbon ages to calibrated (cal) ages for the interval 24,000–0 cal BP (Before Present, 0 cal BP = AD 1950), based upon a sample set of dendrochronologically dated tree rings, uranium-thorium dated corals, and varve-counted marine sediment. The14C age–cal age information, produced by many laboratories, is converted to Δ14C profiles and calibration curves, for the atmosphere as well as the oceans. We discuss offsets in measuredl4C ages and the errors therein, regional14C age differences, tree–coral14C age comparisons and the time dependence of marine reservoir ages, and evaluate decadalvs. single-year14C results. Changes in oceanic deepwater circulation, especially for the 16,000–11,000 cal BP interval, are reflected in the Δ14C values of INTCAL98.
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            Modeling Atmospheric 14C Influences and 14C Ages of Marine Samples to 10,000 BC

            The detailed radiocarbon agevs.calibrated (cal) age studies of tree rings reported in this Calibration Issue provide a unique data set for precise14C age calibration of materials formed in isotopic equilibrium with atmospheric CO2. The situation is more complex for organisms formed in other reservoirs, such as lakes and oceans. Here the initial specific14C activity may differ from that of the contemporaneous atmosphere. The measured remaining14C activity of samples formed in such reservoirs not only reflects14C decay (related to sample age) but also the reservoir14C activity. As the measured sample14C activity figures into the calculation of a conventional14C age (Stuiver & Polach 1977), apparent14C age differences occur when contemporaneously grown samples of different reservoirs are dated.
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              10.1007/978-1-4899-4485-6

              (2000)
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                Author and article information

                Journal
                Internet Archaeology
                IA
                Council for British Archaeology
                13635387
                1999
                1999
                :
                : 7
                Affiliations
                [1 ]Cardiff University
                Article
                10.11141/ia.7.1
                0804df46-e226-461c-89c4-1f685f07d6cf
                © 1999

                This work is licensed under a Creative Commons Attribution 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0/

                History

                Pre-history,Early modern history,Archaeology,Anthropology,Ancient history,History
                Pre-history, Early modern history, Archaeology, Anthropology, Ancient history, History

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