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Potassium occurs in two stable isotopes (Ar atoms trapped inside minerals.What simplifies things is that potassium is a reactive metal and argon is an inert gas: Potassium is always tightly locked up in minerals whereas argon is not part of any minerals. So assuming that no air gets into a mineral grain when it first forms, it has zero argon content.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.Specifically, its presence in solid rock cannot be explained by other mechanisms.When Ar, the gas may be unable to diffuse out of the host rock.The potassium-argon (K-Ar) isotopic dating method is especially useful for determining the age of lavas.

One out of every 10,000 Potassium atoms is radioactive Potassium-40 (K-40).In these materials, the decay product Ar is not trapped by the rock while it is liquid (molten), but starts to accumulate when the rock solidifies (recrystallises).Time since recrystallization is calculated by measuring the ratio of the amount of The quickly cooled lavas that make nearly ideal samples for K-Ar dating also preserve a record of the direction and intensity of the local magnetic field as the sample cooled past the Curie temperature of iron.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.

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