An Online Application for ΔR Calculation

Research output: Contribution to journalArticle

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Abstract

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

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coral
calibration
museum
software
calculation
Uncertainty
method
14C Dates
distribution
code
programme
Museum Collections
Calibration
Software
Radiocarbon Calibration

Cite this

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title = "An Online Application for ΔR Calculation",
abstract = "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.",
author = "Ron Reimer and Reimer, {Paula J.}",
year = "2017",
doi = "10.1017/RDC.2016.117",
language = "English",
journal = "Radiocarbon",
issn = "0033-8222",
publisher = "University of Arizona",

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An Online Application for ΔR Calculation. / Reimer, Ron; Reimer, Paula J.

In: Radiocarbon Journal, 2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - An Online Application for ΔR Calculation

AU - Reimer, Ron

AU - Reimer, Paula J.

PY - 2017

Y1 - 2017

N2 - 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.

AB - 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.

U2 - 10.1017/RDC.2016.117

DO - 10.1017/RDC.2016.117

M3 - Article

JO - Radiocarbon

JF - Radiocarbon

SN - 0033-8222

ER -