Carbon dating acuracy


11-Jul-2017 19:53

And indeed, results of calibration are often given as an age range rather than an absolute value.Age ranges are calculated either by the intercept method or the probability method, both of which need a calibration curve.Calibration is not only done before an analysis but also on analytical results as in the case of radiocarbon dating—an analytical method that identifies the age of a material that once formed part of the biosphere by determining its carbon-14 content and tracing its age by its radioactive decay.Carbon-14 is a naturally occurring isotope of the element carbon.Libraries of tree rings of different calendar ages are now available to provide records extending back over the last 11,000 years.The trees often used as references are the bristlecone pine (Pinus aristata) found in the USA and waterlogged Oak (Quercus sp.) in Ireland and Germany.If a sample has the same proportion of radiocarbon as that of the tree ring, it is safe to conclude that they are of the same age.

The most popular and often used method for calibration is by dendrochronology.The first calibration curve for radiocarbon dating was based on a continuous tree-ring sequence stretching back to 8,000 years.



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