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Non radiometric chronometric dating techniques

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decay or the rate of other cumulative changes in atoms resulting from radioactivity. The various isotopes of the same element differ in terms of atomic mass but have the same atomic number..

One half-life is the amount of time required for of the original atoms in a sample to decay.

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Together with stratigraphic principles, radiometric dating methods are used in geochronology to establish the geological time scale.Radiometric dating or radioactive dating is a technique used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed.The method compares the abundance of a naturally occurring radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay.This also works with stone tools which are found abundantly at different sites and across long periods of time.Stratigraphic dating is based on the principle of depositional superposition of layers of sediments called strata.The slope of the line determines the date, and the closeness of fit is a measure of the statistical reliability of the resulting date.