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A naturally or artificially produced radioactive isotope of an element.
(Nuclear Physics) an isotope that is radioactive
ra•di•o•i•so•tope(ˌreɪ di oʊˈaɪ səˌtoʊp)
a radioactive isotope, usu. artificially produced: used in physical and biological research and therapeutics.
ra`di•o•i`so•top′ic (-ˈtɒp ɪk) adj.
A radioactive isotope of a chemical element.
An isotope that is radioactive.
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|Noun||1.||radioisotope - a radioactive isotope of an element; produced either naturally or artificially|
tracer - (radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes
isotope - one of two or more atoms with the same atomic number but with different numbers of neutrons
label - a radioactive isotope that is used in a compound in order to trace the mechanism of a chemical reaction
iodine-131 - heavy radioactive isotope of iodine with a half-life of 8 days; used in a sodium salt to diagnose thyroid disease and to treat goiter
iodine-125 - light radioactive isotope of iodine with a half-life of 60 days; used as a tracer in thyroid studies and as a treatment for hyperthyroidism