An Online Application for ΔR Calculation

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    A regional offset (ΔR) from the marine radiocarbon calibration curve is widely used in calibration software (e.g. CALIB, OxCal) but often is not calculated correctly. While relatively straightforward for known-age samples, such as mollusks from museum collections or annually banded corals, it is more difficult to calculate ΔR and the uncertainty in ΔR for 14C dates on paired marine and terrestrial samples. Previous researchers have often utilized classical intercept methods that do not account for the full calibrated probability distribution function (pdf). Recently, Soulet (2015) provided R code for calculating reservoir ages using the pdfs, but did not address ΔR and the uncertainty in ΔR. We have developed an online application for performing these calculations for known-age, paired marine and terrestrial 14C dates and U-Th dated corals. This article briefly discusses methods that have been used for calculating ΔR and the uncertainty and describes the online program deltar, which is available free of charge.


    • An Online Application for ΔR Calculation

      Rights statement: This article has been published in a revised form in Radiocarbon []. This version is free to view and download for private research and study only. Not for re-distribution, re-sale or use in derivative works. © 2016 by the Arizona Board of Regents on behalf of the University of Arizona

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    Original languageEnglish
    Number of pages5
    JournalRadiocarbon Journal
    Journal publication date2017
    Early online date29 Dec 2016
    Publication statusPublished - 2017
    Event8th Radiocarbon & Archaeology Symposium - Edinburgh, United Kingdom
    Duration: 27 Jun 201601 Jul 2016

    ID: 122949454