IAEA-C9 is Kauri wood, a sub-fossil wood from New Zealand with a low 14C concentration “close to background”. It was obtained by A. Hogg  and used as inter-comparison material in the Fourth International Radiocarbon Intercomparison (FIRI) . The recommended value of the quality control material is the result of the statistical evaluation of the first calibration .
|14C||[0.12 ... 0.21]#||Range, pMC||-||R|
(R/I/C) Classification assigned to the property value for analyte (Recommended/Information/Certified)
Hogg, A. G., Higham, T., Robertson, S., Beukens, R., Kankainen, T., McCormac, F. G. (1995): Radiocarbon age assessment of a new, near background IAEA 14C quality assurance material. Radiocarbon, 37 (2), 797-805.