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Uses of radiation dating

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Since all living organisms on Earth are made up of organic molecules that contain Carbon atoms derived from the atmosphere, they therefore contain Carbon-14 atoms.The Carbon-14 within a living organism is continually decaying, but as the organism is continuously absorbing Carbon-14 throughout its life the ratio of Carbon-14 to Carbon-12 atoms in the organism is the same as the ratio in the atmosphere.We choose a source with a long half-life so that it does not need to be replaced often.Animals and plants have a known proportion of Carbon-14 (a radioisotope of Carbon) in their tissues.The most common tracer is called Technetium-99 and is very safe because it only emits gamma rays and doesn't cause much ionisation.Radiocarbon or Carbon-14 dating is a technique used by scientist to date bones, wood, paper and cloth. It is produced in the Earth’s upper atmosphere when Nitrogen-14 is broken down to form the unstable Carbon-14 by the action of cosmic rays.For geological purposes, this is taken as one year.

Radioactive dating allows the estimation of the age of any object which was alive once, using the natural radioactivity of .

This method is useful for igneous and metamorphic rocks, which cannot be dated by the stratigraphic correlation method used for sedimentary rocks. Some do not change with time and form stable isotopes (i.e.

those that form during chemical reactions without breaking down).

These are released as radioactive particles (there are many types).

This decay process leads to a more balanced nucleus and when the number of protons and neutrons balance, the atom becomes stable.