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AN INTERCOMPARISON PROJECT ON 14C FROM SINGLE-YEAR TREE RINGS

Published online by Cambridge University Press:  07 September 2021

Sabrina G K Kudsk Open the ORCID record for Sabrina G K Kudsk [Opens in a new window] ,
Jesper Olsen Open the ORCID record for Jesper Olsen [Opens in a new window] ,
Gregory W L Hodgins ,
Mihály Molnár Open the ORCID record for Mihály Molnár [Opens in a new window] ,
Todd E Lange ,
Jessica A Nordby ,
A J Timothy Jull Open the ORCID record for A J Timothy Jull [Opens in a new window] ,
Tamás Varga Open the ORCID record for Tamás Varga [Opens in a new window] ,
Christoffer Karoff  and
Mads F Knudsen
Sabrina G K Kudsk*
Affiliation:
Institute for Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, DK-8000 Aarhus C, Denmark
Jesper Olsen
Affiliation:
Aarhus AMS Centre (AARAMS), Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
Gregory W L Hodgins
Affiliation:
University of Arizona AMS Laboratory, Department of Physics, University of Arizona, Tucson, AZ 85721, USA
Mihály Molnár
Affiliation:
Isotope Climatology and Environmental Research Centre (ICER), Institute for Nuclear Research, H-4026 Debrecen, Hungary
Todd E Lange
Affiliation:
University of Arizona AMS Laboratory, Department of Physics, University of Arizona, Tucson, AZ 85721, USA
Jessica A Nordby
Affiliation:
University of Arizona AMS Laboratory, Department of Physics, University of Arizona, Tucson, AZ 85721, USA
A J Timothy Jull
Affiliation:
University of Arizona AMS Laboratory, Department of Physics, University of Arizona, Tucson, AZ 85721, USA Isotope Climatology and Environmental Research Centre (ICER), Institute for Nuclear Research, H-4026 Debrecen, Hungary Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA
Tamás Varga
Affiliation:
Isotope Climatology and Environmental Research Centre (ICER), Institute for Nuclear Research, H-4026 Debrecen, Hungary
Christoffer Karoff
Affiliation:
Institute for Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, DK-8000 Aarhus C, Denmark Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
Mads F Knudsen
Affiliation:
Institute for Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, DK-8000 Aarhus C, Denmark
*
*Corresponding author. Email: sgbn@geo.au.dk
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Abstract

A laboratory intercomparison project was carried out on 20 annually resolved late-wood samples from the Danish oak record. The project included the following three laboratories: (1) the University of Arizona AMS Laboratory, University of Arizona, USA (AA); (2) HEKAL AMS Laboratory, MTA Atomki, Hungary (DeA); and (3) Aarhus AMS Centre (AARAMS), Aarhus University, Denmark (AAR). The large majority of individual data points (96%) lie within ±2σ of the weighted mean. Further assessment of the accuracy associated with the individual laboratories showed good agreement, indicating that consistent and reliable 14C measurements well in agreement with each other are produced at the three laboratories. However, the quoted analytical uncertainties appear to be underestimated when compared to the observed variance of differences from the geometric mean of the samples. This study provides a general quality check of the single-year tree-ring 14C measurements that are included in the new calibration curve.

Keywords

IntCalintercomparisonradiocarbon datingsingle-year measurementtree ring
Type
Research Article
Information
Radiocarbon , Volume 63 , Issue 5 , October 2021 , pp. 1445 - 1452
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Copyright
© The Author(s), 2021. Published by Cambridge University Press for the Arizona Board of Regents on behalf of the University of Arizona

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