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Radon, generated by the radioactive decay of radium, is present in air.

Organic materials typically contain small amounts of radioactive carbon and potassium.

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.

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.

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.

For example, hydrogen, the lightest element, has three isotopes, which have mass numbers 1, 2, and 3.Only hydrogen-3 (tritium), however, is a radioactive isotope; the other two are stable.More than 1,800 radioactive isotopes of the various elements are known.Cosmic radiation from the Sun and other stars is a source of background radiation on Earth.Other radioactive isotopes are produced by humans via nuclear reactions, which result in unstable combinations of neutrons and protons.

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