Potassium—argon datingabbreviated K—Ar datingis a radiometric dating method used in geochronology and archaeology.
Comparisons between the observed abundance of certain naturally occurring radioactive isotopes and their decay products, using known decay rates, can be used to measure timescales ranging from before the birth of the Earth to the present. For example measuring the ratio of stable and radioactive isotopes in meteorites can give us information on their history and provenance. Radiometric dating techiques were pioneered by Bertram Boltwood inwhen he was the first to establish the age of rocks by measuring the decay products of the uranium to lead.
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