Potassium argon dating technique
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.It is based on the fact that some of the radioactive isotope of Potassium, Potassium-40 (K-40) ,decays to the gas Argon as Argon-40 (Ar-40).By comparing the proportion of K-40 to Ar-40 in a sample of volcanic rock, and knowing the decay rate of K-40, the date that the rock formed can be determined.Potassium-Argon Dating Potassium-Argon dating is the only viable technique for dating very old archaeological materials.Geologists have used this method to date rocks as much as 4 billion years old.
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Potassium (K) is one of the most abundant elements in the Earth's crust (2.4% by mass).