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This is very useful as a record of the radiocarbon concentration in the past.

If we have a tree that is 500 years old we can measure the radiocarbon in the 500 rings and see what radiocarbon concentration corresponds to each calendar year.

For two important reasons, this does not mean that the sample comes from 3619 BC: Many types of tree reliably lay down one tree ring every year.

The wood in these rings once laid down remains unchanged during the life of the tree.

For older periods we are able to use other records of with idependent age control to tell us about how radiocarbon changed in the past.This method will tell you the years in which the radiocarbon concentration of tree rings is within two standard deviations of your measurement (e.g.between 2940BP and 3060BP for the measurement 3000 -30BP).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.To extend this method further we must use the fact that tree ring widths vary from year to year with changing weather patterns.

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