Why are people in Japan who are exposed to radiation being given supplemental iodine?

To limit the amount of radioactive iodine uptake by the thyroid.  Further info regarding the administration of potassium iodide as a thyroid blocking agent in radiation emergencies can be found on he FDA website.


Source

Wingard, J. "Treatment of radiation injury in the adult" Up to Date. 15 March 2011.
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