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Why Iodine Tablets Come Out When Radiation Threatens

Children in Kawamata, Japan, take potassium iodide on Monday to protect against thyroid cancer after being evacuated from the vicinity of the Fukushima Daiichi Nuclear Power Plant. (Asahi Shimbun via Getty Images)
Children in Kawamata, Japan, take potassium iodide on Monday to protect against thyroid cancer after being evacuated from the vicinity of the Fukushima Daiichi Nuclear Power Plant. (Asahi Shimbun via Getty Images)

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