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noun, Chemistry.
a radioactive isotope of iodine having a mass number 131 and a half-life of 8.6 days, used in the diagnosis and treatment of disorders of the thyroid gland.

iodine-131 n.
A radioisotope of iodine that emits beta and gamma rays, has a half-life of 8.05 days, and is used as a tracer in thyroid studies and as therapy in hyperthyroidism and thyroid cancer.


Read Also:

  • Iodine-fast

    iodine-fast adj. Of or relating to hyperthyroidism unresponsive to iodine therapy.

  • Iodine-induced hyperthyroidism

    iodine-induced hyperthyroidism n. See Jod-Basedow phenomenon.

  • Iodine stain

    iodine stain n. A stain used to detect a variety of polysaccharides, such as cellulose, chitin, and glycogen, in which potassium iodide reacts with starch to produce a blue color.

  • Iodinophil

    iodinophil i·o·din·o·phil (ī’ə-dĭn’ə-fĭl) or i·o·din·o·phile (-fīl’) n. A histologic element that stains readily with iodine. adj. Iodinophilous.

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