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radioactive

   Also found in: Dictionary/thesaurus, Acronyms, Encyclopedia, Wikipedia, Hutchinson 0.01 sec.
ra·di·o·ac·tive (rd--ktv)
adj.
Of or exhibiting radioactivity.
radioactive
[rā′dē·ōak′tiv]
Etymology: L, radius, ray, activus, active
giving off radiation as the result of the disintegration of atomic nuclei.
radioactive [ra″de-o-ak´tiv]
characterized by radioactivity.
radioactive iodine uptake test radioiodine uptake test.
radioactive
characterized by radioactivity.
radioactive decay
spontaneous decomposition of the nuclei of the atoms of radioactive substances. Measured as the proportion of the atoms in a radionuclide that decompose per unit of time, usually stated as the half-life of that particular isotope.
radioactive fallout
dissemination of radioactive substances through the atmosphere and deposition on the environment generally; causes radiation injury.
radioactive isotope
radionuclide. A radioactive nuclide, e.g. radioactive iodine or strontium.
radioactive tracer
see radioactive tracer.
radioactive
adjective Referring to radioactivity or emission of radiation–eg, alpha or beta particles, or gamma rays from an atomic nucleus
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