IAEA-C9 is a sub-fossil Kauri wood (Agathis australis) sample, from a peat swamp in Northland, New Zealand, obtained by A.Hogg and T. Higham with a very low 14C concentration  similar to IAEA-C4. The new material was prepared from a single 6m long plank with a weight of 80 kg. Small wood slabs of the original material were prepared as samples by E.M. Scott, University of Glasgow, with no further sample milling applied to avoid any possibility of contamination during this process. Further extensive details on this material are given in the report of the Fourth International Radiocarbon Intercomparison (FIRI) , especially in section 6 (pages 227-248).
The recommended value of this quality control material is the result of the statistical evaluation of an interlaboratory comparison [3,4].
Reference date for decay correction: 1991-01-01
|0.12 - 0.21*|
*) Marked value is the 95% confidence interval for the median, as reported in the respective literature 
HOGG, A.G., HIGHAM, T., ROBERTSON, S., BEUKENS, R., KANKAINEN, T., MCCORMAC, F.G., Radiocarbon age assessment of a new, near background IAEA 14C quality assurance material, Radiocarbon 37 2 (1995) 797-805.
SCOTT, E.M., The Fourth International Radiocarbon Intercomparison (FIRI), Radiocarbon 45 2 (2003) 135-380.
ROZANSKI, K., Consultants' group meeting on 14C reference materials for radiocarbon laboratories. February 18-20, 1991, Vienna, Austria. Internal Report, IAEA, Vienna (1991).
ROZANSKI, K., STICHLER, W., GONFIANTINI, R., SCOTT, E. M., BEUKENS, R. P., KROMER, B., VAN DER PLICHT, J., The IAEA 14C Intercomparison exercise 1990, Radiocarbon, 34 3 (1992) 506-519.