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That is, a fresh mineral grain has its K-Ar "clock" set at zero.The method relies on satisfying some important assumptions: Given careful work in the field and in the lab, these assumptions can be met.Some of the problems of K-Ar dating can be avoided by the use of the related Ar-Ar dating method.In this article we shall explain how this method works and why it is superior to the K-Ar method.These each have 19 protons and 21 neutrons in their nucleus.If one of these protons is hit by a beta particle, it can be converted into a neutron.

For every 100 K-40 atoms that decay, 11 become Ar-40.The amount of Argon sublimation that occurs is a function of the purity of the sample, the composition of the mother material, and a number of other factors.These factors introduce error limits on the upper and lower bounds of dating, so that final determination of age is reliant on the environmental factors during formation, melting, and exposure to decreased pressure and/or open-air.However, if you put it near the core of a nuclear reactor, so that it is bombarded by neutrons, then this will convert it into Ar.This isotope of argon is quite unstable, having a half-life of only 269 years.Potassium–argon dating, abbreviated K–Ar dating, is a radiometric dating method used in geochronology and archaeology.

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