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The results of calibration are often given as an age range.

In this case, we might say that we could be 95% sure that the sample comes from between 1375 cal BC and 1129 cal BC.

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.

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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.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.The wood in these rings once laid down remains unchanged during the life of the tree.This is very useful as a record of the radiocarbon concentration in the past.

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