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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

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.
Farlex Partner Medical Dictionary © Farlex 2012
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.
"In theory, the Iodine 131 could have come from any radioactive waste processing facility," Matisoff said.
This exposure to iodine 131 is very possibly the origin of many thyroid disorders we're seeing today.
Ladenson also said that rTSH therapy promoted longer retention of iodine 131 and decreased the amount of whole body radiation exposure.
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.
The ban was ordered after two turnips and a spinach sample arriving in two consignments from Japan on Wednesday were confirmed to be irradiated by iodine 131 up to 10 times the international legal level, Secretary for Food & Health Prof Gabriel Leung said.
"Iodine 131 is the worst environmental actor emitting from the four stricken nuclear facilities in Japan's northeast.
Speaking at a special meeting of Louth Co Council yesterday, experts for British Nuclear Fuels Ltd said the iodine tablets were effective only when taken in response to a leak of the radioactive isotope iodine 131.
officials detected iodine 131 emissions with a concentration higher than that allowed by law coming from the affected building in Tokaimura, Ibaraki Prefecture, from Thursday to Saturday.