AN INTERCOMPARISON PROJECT ON 14C FROM SINGLE-YEAR TREE RINGS. Issue 5 (7th October 2021)

• Record Type: Journal Article
• Authors: Kudsk, Sabrina G K; Olsen, Jesper; Hodgins, Gregory W L; Molnár, Mihály; Lange, Todd E; Nordby, Jessica A; Jull, A J Timothy; Varga, Tamás; Karoff, Christoffer; Knudsen, Mads F
• Is Part Of: Radiocarbon. Volume 63:Issue 5(2021)
• Page Start: 1445
• Page End: 1452
• Publication Date: 2021-10-07
• Subjects: IntCal -- intercomparison -- radiocarbon dating -- single-year measurement -- tree ring; Radiocarbon dating -- Periodicals; 930.1028505
• DOI: 10.1017/RDC.2021.75
• Languages: English
• ISSNs: 0033-8222

Abstract

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 14 C 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 14 C measurements that are included in the new calibration curve.