iodine 131

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 (I) [i´o-dīn]
a chemical element, atomic number 53, atomic weight 126.904. (See Appendix 6.) Iodine is essential in nutrition, being especially prevalent in the colloid of the thyroid gland. It is used in the treatment of hypothyroidism and as a topical antiseptic. Iodine is a frequent cause of poisoning (see iodism). Deficiency of iodine causes goiter. Since iodine salts are opaque to x-rays, they can be combined with other compounds and used as contrast media in diagnostic x-ray examinations of the gallbladder and kidneys.
iodine 123 a radioactive isotope of iodine having a half-life of 13.2 hours and emitting gamma rays and x-rays. It is used in diagnostic imaging and as radiation sources in radiation therapy. Symbol 123I.
iodine 125 a radioisotope of iodine having a half-life of 60.14 days and emitting gamma rays; used as a label in radioimmunoassays and other in vitro tests, and also for thyroid imaging. Symbol 125I.
iodine 131 a radioactive isotope of iodine having a half-life of 8.04 days and emitting beta particles and gamma rays. It is used as a tracer in diagnostic imaging and as a radiation source in radiation therapy. Symbol 131I.
protein-bound iodine a test of thyroid function; see also protein-bound iodine test.
radioactive iodine radioiodine.
iodine solution a transparent, reddish brown liquid, each 100 ml of which contains 1.8 to 2.2 g of iodine and 2.1 to 2.6 g of sodium iodide; a local antiinfective agent.
strong iodine solution Lugol's solution.

i·o·dine 131

A radioactive iodine isotope; beta and gamma emitter with a half-life of 8.1 days; used as a tracer in thyroid studies, as therapy in hyperthyroidism and thyroid cancer, and as a label in immunoassay and imaging; formerly used as therapy in heart disease.
References in periodicals archive ?
A possible source could be a reactor used for electricity or research or a plant using iodine 131 to make medical devices, the IRSN speculated.
A person whose drinking water contained the maximum amount of iodine 131 allowed under federal standards would have to drink two liters a day for 30 years to produce a 1 in 10,000 chance of developing a fatal cancer.
Humans would have been exposed to Iodine 131 through inhalation or when it entered the food chain through sheep and dairy cows eating contaminated grass.
Japanese officials have warned that infants in Tokyo and surrounding areas should not drink tap water because of the increased level of iodine 131 detected in it.
A spokesman for the Department of Health said that as far as the Department was aware Sellafield was still handling iodine 131 when the tablets were issued in June 2002.
01 ablative doses of iodine 131 (i-131) of 200 mci (millicuries)
The most significant release of radiation at Chernobyl involved two by-products of uranium fission - Iodine 131 and Cesium 137.
Ventilators in the conversion building where the accident occurred, blamed for the emission of iodine 131, were turned off Monday afternoon.
Contract awarded for 617-2015 sps-465 ablative dose treatment of iodine 131 (i-131) of 100 mci (millicuries)
Lot 2 Iodine 131 sodium iodide capsules for diagnosis and treatment amount to three-year auction, net of renewal, at 102 450 EUR plus VAT and amounted to 68 300 EUR plus VAT, for the possible renewal option +;