Radiometric dating of potassium

The potassium-argon (K-Ar) isotopic dating method is especially useful for determining the age of lavas.Developed in the 1950s, it was important in developing the theory of plate tectonics and in calibrating the geologic time scale.

Then the gas sample is cleaned of all unwanted gasses such as H, nitrogen and so on until all that remains are the inert gasses, argon among them. This dating method is based upon the decay of radioactive potassium-40 to radioactive argon-40 in minerals and rocks; potassium-40 also decays to calcium-40.Thus, the ratio of argon-40 and potassium-40 and radiogenic calcium-40 to potassium-40 in a mineral or rock is a measure of the age of the sample.The Ar-Ar method is considered superior, but some of its problems are avoided in the older K-Ar method.Also, the cheaper K-Ar method can be used for screening or reconnaissance purposes, saving Ar-Ar for the most demanding or interesting problems.

Potassium occurs in two stable isotopes (Ar atoms trapped inside minerals.

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Radiometric dating In 1905, shortly after the discovery of radioactivity, the American chemist Bertram Boltwood suggested that lead is one of the. 
21-Jun-2018 13:17
Radioactive Parent Stable Daughter Half life Potassium 40 Argon 40 1.25 billion yrs. Rubidium 87 Strontium 87 48.8 billion yrs Thorium 232 Lead. 
21-Jun-2018 13:21

Radiometric dating of potassium introduction

Radiometric dating of potassium

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