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This requires a computer since the calculations are more complicated.It gives the time range, from which you can be 95% sure the sample came.The pair of blue curves show the radiocarbon measurements on the tree rings (plus and minus one standard deviation) and the red curve on the left indicates the radiocarbon concentration in the sample.The grey histogram shows possible ages for the sample (the higher the histogram the more likely that age is).Since the calendar age of the tree rings is known, this then tells you the age of your sample.In practice this is complicated by two factors: These effects are most clearly seen by looking at a specific example.

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.By using dead trees of different but overlapping ages, you can build up a library of tree rings of different calendar ages.This has now been done for Bristlecone Pines in the U. A and waterlogged Oaks in Ireland and Germany, and Kauri in New Zealand to provide records extending back over the last 14,000 years.To extend this method further we must use the fact that tree ring widths vary from year to year with changing weather patterns.By using these widths, it is possible to compare the tree rings in a dead tree to those in a tree that is still growing in the same region.

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