• WordNet 3.6
    • n iodine-131 heavy radioactive isotope of iodine with a half-life of 8 days; used in a sodium salt to diagnose thyroid disease and to treat goiter
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In news:

Nuclear imager Jeff Meditz checks a monitor to follow the progress of the I-131 radioactive iodine capsule taken by a thyroid cancer patient.
It's a radioactive iodine capsule referred to as I-131 and is being used at UPMC Cancer Center in New Castle.
Concerns about food safety spread Wednesday to Tokyo after officials said tap water showed elevated levels: 210 becquerels per liter of iodine-131 — more than twice the recommended limit of 100 becquerels per liter for infants.
The recent nuclear disaster at the Fukushima Daiichi and Fukushima Daini nuclear power plants in Japan have raised questions about the use iodine supplements as effective protection from radioactive iodine I-131 here in Hawai'i.