Its 14C concentration was about 5% above what was believed to be the natural level, so the standard for radiocarbon dating was defined as 0.95 times the 14C concentration of this material, adjusted to a 13C reference value of −19 per mil (PDB).
Konsentrasi 14C kira-kira 5% melebihi apa yang diyakini sebagai kadar alami, sehingga standar penanggalan radiokarbon telah ditetapkan 0.95 kali konsentrasi 14C dalam senyawa ini, disesuaikan dengan nilai rujukan 13C yaitu –19 per mil (PDB).