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

  • A. G. Hogg (a1), Thomas Higham (a1), Steve Robertson (a2), Roelf Beukens (a3), Tuovi Kankainen (a4), F.G. McCormac (a5), Johannes Van Der Plicht (a6) and Minze Stuiver (a7)...

Abstract

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.

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Copyright

References

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Rozanski, K. 1991 Report of the International Atomic Energy Agency Consultants' Group Meeting on C-14 Reference Materials for Radiocarbon Laboratories, Feb. 18–20, 1991. Section of Isotope Hydrology, IAEA, Vienna.
Rozanski, K., Stichler, W., Rozanski, R., Scott, E. M., Beukens, R. P., Kromer, B. and van der Plicht, J. 1992 The IAEA 14C Intercomparison Exercise 1990. In Long, A. and Kra, R. S., eds., Proceedings of the 14th International 14C Conference. Radiocarbon 34(3): 506519.
Wilson, S. R. and Ward, G. K. 1981 Evaluation and clustering of radiocarbon age determinations: Procedures and paradigms. Archaeometry 23(1): 1939.

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