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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.

Although one can simply measure older samples for longer times, there are practical limits to the minimum sample activity that can be measured.

By measuring the radiocarbon age of tree rings of known or other independently dated samples it is possible to construct calibration datasets. The single year dataset UWSY98 (Stuiver et al 1998) is also still in use for short-lived samples 350 14C BP.

Our measurements of secondary standards show that the deviation within a population of samples is generally 1-3 permil greater than the reported error for a single sample.

Radiocarbon age is calculated from Reporting of ages and/or activities follows the convention outlined by Stuiver and Polach (1977) and Stuiver (1980).

Organic materials, which require the most processing, are limited to younger ages by their corresponding process blank.

Due to counting and measurement errors for the blanks and samples, statistical errors are higher for very old samples.

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