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Radiocarbon dating can be used on samples of bone, cloth, wood and plant fibers.

The half-life of a radioactive isotope describes the amount of time that it takes half of the isotope in a sample to decay.

Archaeologists use the exponential, radioactive decay of carbon 14 to estimate the death dates of organic material.

The stable form of carbon is carbon 12 and the radioactive isotope carbon 14 decays over time into nitrogen 14 and other particles.

This half life is a relatively small number, which means that carbon 14 dating is not particularly helpful for very recent deaths and deaths more than 50,000 years ago.Please email the lab for the rates.*****In order to provide radiocarbon determinations that are both accurate and precise, it is necessary to correct for “isotopic fractionation” using the stable isotopes 13C and 12C.This correction factors out error introduced from metabolic and respiratory pathway differences between the modern reference standard material and the sample material. Two δ13C values are measured at Beta Analytic: – One is the value applicable to correct for total fractionation (natural, chemistry and AMS).The atmospheric concentration of C becomes the fingerprint of this radioisotope in a given year's food supply.Herbivores lag the atmosphere slightly because their primary carbon source is on the order of months old.

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