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Radiocarbon Age Assessment of a New, Near Background Iaea 14C Quality Assurance Material

Published online by Cambridge University Press:  18 July 2016

A. G. Hogg
Radiocarbon Laboratory, University of Waikato, Private Bag 3105, Hamilton, New Zealand
Thomas Higham
Radiocarbon Laboratory, University of Waikato, Private Bag 3105, Hamilton, New Zealand
Steve Robertson
Radiocarbon Dating Research, Australian National University, Canberra, ACT 2600 Australia
Roelf Beukens
IsoTrace Laboratory, University of Toronto, Toronto, Ontario M5S 1A7 Canada
Tuovi Kankainen
Geological Survey of Finland, FIN-02150 Espoo, Finland
F.G. McCormac
Radiocarbon Laboratory, Queen's University of Belfast, Belfast BT7 INN Northern Ireland
Johannes Van Der Plicht
Centre for Isotope Research, University of Groningen, NL-9718 CM Groningen, The Netherlands
Minze Stuiver
Quaternary Research Center, University of Washington, Seattle, Washington 98195 USA
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The 14C Quality Assurance Programme coordinated by the IAEA (Rozanski et al. 1992) prepared a set of five new intercomparison materials, including 40–50 ka old subfossil wood excavated from New Zealand peat bogs (IAEA C-4 standard). Statistical analysis of 79 14C measurements made on the wood indicated considerable variation in the results, with a marked skewness toward more modern values. The wide range of results and the possibility of inhomogeneity within the standard prompted the recovery and analysis of replacement material. The new subfossil wood sample is kauri (Agathis australis), at least 50 ka old, excavated from a swamp in Northland. It is in the form of a single plank, 6 m long, weighing 80 kg. It will be forwarded to the IAEA in Vienna for milling and distribution. Subsamples were obtained from both ends of the plank and analyzed by six laboratories. We present here the results of these analyses and compare them with the previous IAEA intercalibration results for the C-4 standard.

V. Advances in Measurement Techniques
Copyright © the Department of Geosciences, The University of Arizona 


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