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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.
Radon, generated by the radioactive decay of radium, is present in air.
Organic materials typically contain small amounts of radioactive carbon and potassium.
Every chemical element has one or more radioactive isotopes.
Other radioactive isotopes are produced by humans via nuclear reactions, which result in unstable combinations of neutrons and protons.
Medical applications use artificial radioisotopes that have been produced from stable isotopes bombarded with neutrons.