The technique called radiometric dating is based on

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In contrast to the most simple radiometric dating techniques, isochron dating, which can be used for many isotopic decay sequences (e.g.

rubidium-strontium decay sequence), does not require knowledge of the initial proportions.

Radiometric dating is a technique used to date materials based on a knowledge of the decay rates of naturally occurring isotopes, and the current abundances.

It is our principal source of information about the age of the Earth and a significant source of information about rates of evolutionary change.

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All ordinary matter is made up of combinations of chemical elements, each with its own atomic number, indicating the number of protons in the atomic nucleus.

When a material incorporates both the parent and daughter nuclides at the time of formation, it may be necessary to assume that the initial proportions of a radioactive substance and its daughter are known.

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