radioactive iodine

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Related to radioactive iodine: radioactive iodine uptake


 (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.

ra·di·o·ac·tive i·o·dine

the iodine radioisotopes 131I, 125I, or 123I used as tracers in biology and medicine.
Farlex Partner Medical Dictionary © Farlex 2012

radioactive iodine

Any of the radionuclides of iodine, the most commonly used of which is beta- and gamma-emitting 131I, with a half-life of 8 days. It is used clinically as an implant for treating thyroid cancer and hyperactivity, and for scintigraphy of other organs. The gamma-emitting 125I has a half-life of 59.4 days and has been used in bioassays, nuclear medicine imaging and in radiation oncology as brachytherapy to treat prostate cancer and brain tumours.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

radioactive iodine

Radioiodine A radioisotope of iodine–eg, 131I or 123I, used for imaging or to treat CA. See Radioactive iodine uptake.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
TSH after six months with age, gender and radioactive iodine dose was assessed through the same statistical tests as mentioned above.
* Potassium iodide, taken up to two days before and up to eight hours following contact with radioactive iodine protects your thyroid gland from cancer.
Patients with Graves' disease have traditionally been prescribed radioactive iodine, but the new guidelines acknowledge the three treatment options: surgery, antithyroid medications, and radioactive iodine.
The firm has revealed measurements of radioactive iodine found in water in the basements of the turbine buildings of nuclear reactors at the plant, in the trenches outside the reactors and in the nearby sea.
A joint statement from The Endocrine Society, the American Association of Clinical Endocrinologists, the American Thyroid Association, and the Society of Nuclear Medicine emphasizes that potassium iodide (KI) should not be taken unless there is a clear risk of exposure to high levels of radioactive iodine. Ingesting pills or solution of KI (a stable salt of iodine) can potentially block uptake of radioactive iodine by the thyroid gland.
Highly sophisticated equipment in Oxfordshire, Glasgow and Dublin has found radioactive iodine in the atmosphere known to have come from the stricken Japanese reactor.
Tokyo, March 30 (BNA) -- The Nuclear and Industrial Safety Agency says radioactive iodine in excess of 3,300 times the national limit was found in seawater near the troubled Fukushima Daiichi nuclear plant on Tuesday afternoon.
EXTREMELY low levels of radioactive iodine from the tsunami-hit Japanese nuclear plant have been detected in parts of the UK, the Health Protection Agency said yesterday.
The Nikkei index fell after the Tokyo metropolitan government warned that infants should not drink tap water as radioactive iodine in excess of the limit was detected in water at a purification plant in Tokyo.
Tokyo, March 27, 2011 (Frontier Star): Radioactive iodine 1,250 times over the permissible limit has been detected in the sea off the stricken Fukushima nuclear power plant in Japan, officials said Saturday.
Levels of radioactive iodine are 1250 times the safe limit, two weeks on from the earthquake and tsunami that wrecked the Japanese power stations.