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Beta Analytic is an accredited ISO/IEC 17005 radiocarbon dating lab based in Florida, USA.

BETA has been the world leader in Carbon-14 measurements since 1979.

The Fraction Modern corrected for δC of a sample 10 separate times over the course of a run.

The final reported error is the larger of the internal or external error, propagated with errors from the normalizing standards and blank subtraction.

In order to remove the effects of isotopic fractionation, the Fraction Modern is then corrected to the value it would have if its original δC value to which all radiocarbon measurements are normalized.) The fractionation correction is done using the 13/12 ratio measured by the AMS system.

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

For small samples, blank contribution as a fraction of sample mass becomes a more important term, so a mass balance blank correction is applied.

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.

Fractionation is the term used to describe the differential uptake of one isotope with respect to another.

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At the present time, for a 1 milligram sample of graphite, this limiting age is about ten half-lives, or 60,000 years, if set only by the sample size.

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