Isotope dating accuracy
The Conventional Radiocarbon Age BP is calculated using the radiocarbon decay equationt=-8033 ln(Asn/Aon)Where -8033 represents the mean lifetime of 14C (Stuiver and Polach, 1977).
The δ13C value for a sample can yield important information regarding the environment from which the sample comes or the mixtures of materials used to produce it because the isotope value of the sample reflects the isotopic composition of the immediate environment.
Fractionation during the geochemical transfer of carbon in nature produces variation in the equilibrium distribution of the isotopes of carbon (12C, 13C and 14C).
Craig (1953) first identified that certain biochemical processes alter the equilibrium between the carbon isotopes.
Atoms of larger or smaller mass may be favored in such a situation.
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If, however, the entire sample is converted completely from one form to another (e.g.solid to gas, acetylene to benzene) then no laboratory-induced fractionation will occur.
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