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

It is expected then, for a 5,570 year (1 half-life) or 11,140 year old (2 half-lives) sample that 125 or 63 counts per second would be obtained.

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

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.

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.

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