argon-argon datingYet even this seminal K-Ar dating study was plagued by the seemingly insurmountable problem of contamination. The principal materials for dating East Africa. The K-Ar dating method utilizes the decay of the naturally-occurring radioactive isotope of potassium, 40K, into an isotope of the noble gas, argon (i.e., 40Ar). Argon–argon dating is a radioisotopic method based on the natural, spontaneous radioactive decay of an isotope of potassium, ⁴⁰K, at a known rate to produce an isotope of argon, ⁴⁰Ar. This method is one of the most versatile, precise and accurate of all radioisotopic dating tools applied to volcanic materials.
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