iodine I 131

Definition / meaning of iodine I 131

A radioactive isotope of iodine with an atomic mass of 131, a half life of eight days, and potential antineoplastic activity. Selectively accumulating in the thyroid gland, iodine I 131 emits beta and gamma particles, thereby killing thyroid cells and decreasing thyroid hormone production.

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Source(s):

The Web site of the National Cancer Institute (http://www.cancer.gov/)

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