iodine 131

noun Chemistry.

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.

Nearby words

  1. iodide,
  2. iodimetry,
  3. iodin,
  4. iodinate,
  5. iodine,
  6. iodine stain,
  7. iodine-123,
  8. iodine-125,
  9. iodine-131,
  10. iodine-fast

Compare radioiodine. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Medicine definitions for iodine-131



A radioisotope of iodine that emits beta and gamma rays, has a half-life of 8.05 days, and is used as a tracer in thyroid studies and as therapy in hyperthyroidism and thyroid cancer.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.