Radiocarbon dating age earth

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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.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 of radiocarbon results is needed to account for changes in the atmospheric concentration of carbon-14 over time.Radiocarbon dating laboratories have been known to use data from other species of trees.In principle, the age of a certain carbonaceous sample can be easily determined by comparing its radiocarbon content to that of a tree ring with a known calendar age.Nowadays, the internationally agreed upon calendar calibration curves reach as far back as about 48000 BC (Reimer et.al., INTCAL13 and Marine13 radiocarbon age calibration curves 0 – 50000 yrs cal BP, Radiocarbon 55(4), 2013).

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