Meaning of iodine 131

iodine 131

Pronunciation: [key]
— Chem. Chem.
  1. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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