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Although it is less accurate, the Libby half-life was retained to avoid inconsistencies or errors when comparing carbon-14 test results that were produced before and after the Cambridge half-life was derived.

Due to the sweeping and diverse applications of this data, specialists can come from many academic disciplines.

People working professionally with dendro dating use core borers.

That is a type of borer which is hollow and used to cut out a bore core accross the log. That shown on the picture above has a diameter of 7 mm.

Best samples are large samples taken as a plate across the log.

Of course you cannot do this with your favorite house or an old historical house which should be preserved.

Each year, trees add a layer of growth between the older wood and the bark.

This layer, or ring as seen in cross section, can be wide, recording a wet season, or narrow, recording a dry growing season.

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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.Instead of working with entire cross sections of trees, dendrochronologists (tree-ring researchers) often use long, slender cores extracted from trees by a hollow tool.The diagram below shows two cores from different trees in the same area.Interestingly these rings are more than a temperature indicator, they also tell the researcher about moisture and cloudiness as well.Dendrochronology is the study of climate change as recorded by tree growth rings.

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