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Radioactive isotope, also called radioisotope, radionuclide, or radioactive nuclide, any of several species of the same chemical element with different masses whose nuclei are unstable and dissipate excess energy by spontaneously emitting radiation in the form of alpha, beta, and gamma rays.

A radioactive isotope, also known as a radioisotope, radionuclide, or radioactive nuclide, is any of several species of the same chemical element with different masses whose nuclei are unstable and dissipate excess energy by spontaneously emitting radiation in the form of alpha, beta, and gamma rays.

Medical applications use artificial radioisotopes that have been produced from stable isotopes bombarded with neutrons.

tritium), however, is a radioactive isotope, the other two being stable.

One way of artificially inducing nuclear transmutation is by bombarding stable isotopes with alpha particles.

Radioactive isotopes have many useful applications. In particular, they are central to the fields of nuclear medicine and radiotherapy.

Its distribution can be tracked according to the radiation it gives off.

In radiotherapy, radioisotopes typically are employed to destroy diseased cells.

Other radioactive isotopes are produced by humans via nuclear reactions, which result in unstable combinations of neutrons and protons.

Other radioactive isotopes are used as tracers for diagnostic purposes as well as in research on metabolic processes.

When a radioactive isotope is added in small amounts to comparatively large quantities of the stable element, it behaves exactly the same as the ordinary isotope chemically; it can, however, be traced with a Geiger counter or other detection device.

Radiometric dating measures the decay of radioactive atoms to determine the age of a rock sample.

It is founded on unprovable assumptions such as 1) there has been no contamination and 2) the decay rate has remained constant.

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