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This correction is performed as follows: $$Fm_ = Fm_ ( Fm_ - Fm_b)\frac$$ Where \(M\) is sample mass, and \(M_b\) and \(Fm_b\) are the mass and Fm of the blank.Fraction Modern is a measurement of the deviation of the C is also affected by natural isotopic fractionation.After acceleration and removal of electrons, the emerging positive ions are magnetically separated by mass and the C counts per second are collected.

Since atmospheric carbon 14 arises at about the same rate that the atom decays, the Earth's levels of carbon 14 have remained constant.Therefore a 1% error in fraction-modern leads to an 80 year error in the age.Ages are rounded according to the convention of Stuiver & Polach, shown below.Due to variability in sample homogeneity, sample collection, and sample processing, the variability of replicate samples (reproducibility) is generally greater than the reported error for a single sample.A total measurement error can be estimated by adding in quadrature the reported error with this extra variability, or added variance.

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Fractionation must be corrected for in order to make use of radiocarbon measurements as a chronometric tool for all parts of the biosphere.