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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*
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

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.

Type
Research Article
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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