Define radiocarbon dating pookitou20162 datingpoint org

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in which the proportion of carbon isotopes is counted directly (as contrasted with the indirect Geiger counter method) using an accelerator mass spectrometer.

The method drastically reduces the quantity of datable material required.

Determination of the radioactivity of carbon from a sample will reveal the proportion of C14 to C12, and this will in turn, through the known rate of decay of C14, give the age of, or more accurately the time elapsed since the death of, the sample.Two things in the method have to be allowed for: first, the 'date' given is never exact.The /- figure, which should always be quoted, is a statistical one, meaning that there is a 2 to 1 chance that the correct date lies within that bracket.Secondly, the rate of decay of C14 is based in all published examples on a of 5730 /- 40 years (after 5730 years, one half of the C14 will have disintegrated, after another 5730 years one half of the remainder, and so on).Correction tables are used to correct 'raw' radiocarbon dates (quoted as years ad or ).The method yields reliable dates back to about 50,000 bp and under some conditions to about 75,000 bp.

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