Age dating chart

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This figure is directly based on the proportion of radiocarbon found in the sample.It is calculated on the assumption that the atmospheric radiocarbon concentration has always been the same as it was in 1950 and that the half-life of radiocarbon is 5568 years.Using very old trees (such as the Bristlecone Pines in the western U. A.), it is possible to make measurements back to a few thousand years ago.

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The information from measurements on tree rings and other samples of known age (including speleothems, marine corals and samples from sedimentary records with independent dating) are all compiled into calibration curves by the Int Cal group.

These are the basis for the calibrations performed by the programs like CALIB and Ox Cal. Calibration of radiocarbon determinations is in principle very simple.

The cal prefix indicates that the dates are the result of radiocarbon calibration using tree ring data.

These values should correspond exactly to normal historical years BC and AD.

The grey histogram shows possible ages for the sample (the higher the histogram the more likely that age is).

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