IAEA-CH-6 (formerly Sucrose ANU) was supplied to the IAEA by H. Polach, Australian National University, Canberra  as 14C quality control material IAEA-C6. A portion of the original material was intended for stable isotope measurements and was renamed to IAEA-CH-6. It was checked for isotopic homogeneity and its recommended δ13C value was determined in an international calibration . This table shows the recommended δ13C (versus VPDB) values of the reference material.
(R/I/C) Classification assigned to the property value for analyte (Recommended/Information/Certified)
HUT, G., Consultants' Group Meeting on Stable Isotope Reference Samples for Geochemical and Hydrological Investigations, Vienna, Austria, 16 - 18 September 1985. Report to the Director General, International Atomic Energy Agency, Vienna, Austria (1987).
COPLEN, T.B., BRAND, W.A., GEHRE, M., GRÖNING, M., MEIJER, H.A.J., TOMAN, B., VERKOUTEREN, R.M., New guidelines for δ13C measurements, Anal. Chem. 78 (2006) 2439-2441.