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Cal Pal-Online is developed to give a quick reference.For more detailed results, graphical output and different 14C calibration methods, download and use Cal Pal-Beyond the Ghost.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 calibration algorithm will calculate the same results as Cal Pal-Beyond the Ghost.Due to programming details there will be minor differences.

The wood in these rings once laid down remains unchanged during the life of the tree.Since this rate is slow relative to the movement of carbon through food chains (from plants to animals to bacteria) all carbon in biomass at earth's surface contains atmospheric levels of C is present at atmospheric levels, the molecule must derive from a recent plant product.The pathway from the plant to the molecule may have been indirect or lengthy, involving multiple physical, chemical, and biological processes.Carbon-14 is most abundant in atmospheric carbon dioxide because it is constantly being produced by collisions between nitrogen atoms and cosmic rays at the upper limits of the atmosphere.The rate at which C atoms, half of them will decay in 5730 years.A hydrocarbon found in beach sediments, for example, might derive from an oil spill or from waxes produced by plants.

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