What is difference between lugol iodine n radioactive iodine n for what they r used?

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Well, Lugol's idodine solution has potassium iodine in it and when taken the thyroid uptakes that over any radioactive elemental iodine or radioactive iodine compounds .

Your thyroid can only absorb so.much iodine at a time and Lugols solution displaces radioactive idodine so less can be absorbed thereby mitigating the effects on the thyroid.