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Radiochemical dating uses

Radiometric dating, or radioactive dating as it is sometimes called, is a method used to date rocks and other objects based on the known decay rate of radioactive isotopes.

Radiochemistry includes the study of both natural and man-made radioisotopes.

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Radiochemistry is the chemistry of radioactive materials, where radioactive isotopes of elements are used to study the properties and chemical reactions of non-radioactive isotopes (often within radiochemistry the absence of radioactivity leads to a substance being described as being inactive as the isotopes are stable).

Much of radiochemistry deals with the use of radioactivity to study ordinary chemical reactions.

When an atom emits an alpha particle, the product in a new atom whose atomic number and atomic mass number are, respectively, 2 and 4 less than its unstable parent.

The decay of uranium to thorium is one example of alpha emission.

After a creature's death the isotope would slowly decay away over millennia at a fixed rate.