Isotope. Definition

Medical Definition: Isotope

A radioactive substance used in the diagnosis or treatment of cancer. FForma is a chemical element in which the atoms have the same number of protons (parts of the nucleus of an atom), but a different number of neutrons (core parts of an atom). For example, carbon 12, carbon 13 and carbon 14 are isotopes of carbon. They all have six protons in the nucleus, but each has a different number of neutrons. Isotopes can be used in certain procedures and medical examinations.

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