: a light radioactive isotope of iodine that has a mass number of 125 and a half-life of 60 days, gives off soft gamma rays, and is used as a tracer in thyroid studies and as therapy in hyperthyroidism

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“Iodine-125.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/iodine-125. Accessed 27 Mar. 2023.

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