- Types:
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tracer
(radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes
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label
a radioactive isotope that is used in a compound in order to trace the mechanism of a chemical reaction
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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
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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
