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iodine-125

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n.
A radioisotope of iodine with a half-life of 60 days that is used as a tracer in thyroid studies and as therapy in hyperthyroidism.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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