Fractionation radiocarbon dating

1990, without a decay correction Fractionation: The change in isotopic ratio that can occur when a material undergoes a chemical reaction or certain types of physical processes.

The increased activity reached its peak around 1963; atmospheric 14C reached twice the normal level in the Northern Hemisphere and increased by about 60% in the Southern Hemisphere. Calibration: The process of converting a conventional radiocarbon age to a "true" or calendar age.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.Generally, lighter isotopes will proceed more quickly than heavier isotopes.An example of fractionation occurs in the photosynthesis of atmospheric CO2 to form wood cellulose.

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