Cons of carbon 14 dating

The procedure of radiocarbon dating can be used for remains that are up to 50,000 years old.Radiometric dating is the method for establishing the age of objects by measuring the levels of radioisotopes in the sample. It decays to nitrogen 14 with a half life of 5730 years.

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Measurement of the radioactivity of the sample works very well if the sample is large, but in 9 months less than 0.01% of the radiocarbon ions will decay, so in a reasonable measurement time (typically a few weeks) only a very small proportion of the radiocarbon atoms are detected by this method.These ratios provide useful information on the purity of the sample and clues about the diet and climatic conditions of the living organism.The carbon isotope ratio can also be used to correct for isotopic fractionation in the radiocarbon measurement.The sample is put into the ion source either as graphite or as carbon dioxide.It is ionised by bombarding it with caesium ions and then focused into fast-moving beam (energy typically 25ke V).

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