| radioactive d. |
disintegration of the nucleus of an unstable nuclide by the spontaneous emission of charged particles and/or photons; called also radioactive disintegration.
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| radioactive e. |
a chemical element which spontaneously transmutes into another element with emission of corpuscular or electromagnetic radiations. The natural radioactive elements are all those with atomic number above 83, and some other elements, such as potassium (at. no. 19) and rubidium (at. no. 37), which are very weakly radioactive.
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| radioactive i. |
see under tracer.
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| radioactive iodine u. |
uptake of radioiodine from the blood by the thyroid gland; see under test.
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| radioactive iodine uptake t. |
one of the most common thyroid function tests; a known quantity of radioiodine is administered and 24 hours later the per cent is calculated that has been absorbed by the thyroid gland. Patients who have recently been exposed to iodine compounds, such as in dietary supplements, contrast media, medications, or antiseptics, may not be good candidates for this test.
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