Fractionation radiocarbon dating

Δ14C: The 14C isotopic ratio of a material relative to the modern standard after correction for fractionation to d 13C = -25o/oo.Δ14C is only reported if a date of collection, or other date to apply the decay correction to is provided, since otherwise it is a meaningless E F Fraction Modern: defined by Donahue et al.

This is not the true chronological age of the sample, which is obtained by calibrating the conventional age.

Radiocarbon time series of independently dated materials make it possible to calculate calendar ages from radiocarbon dates during the past 26,000 years.

Where such independent age control is available, radiocarbon studies prove to be a unique and powerful chemical tracer of carbon cycle dynamics.

It follows the same technique by which a particle accelerator, usually a tandem, is configured as a mass spectrometer to separate the carbon isotopes in a sample, allowing milligram size samples to be dated CRA: Abbreviation of Conventional Radiocarbon Age Curie: Obsolete unit of radioactivity, equal to 3.7x1010 disintegrations per second.

Replaced by the Becquereltop D δ 13C: The carbon stable isotope ratio of a material relative to the PDB standard.

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AMS: Abbreviation of Accelerator Mass Spectrometry, the technique by which a particle accelerator, usually a tandem, is configured as a mass spectrometer to separate the carbon isotopes in a sample, allowing milligram size samples to be dated.

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