![]() The thyroid gland uses iodine to produce hormones that control how quickly the body uses energy. Inside the body, I-131 accumulates in the thyroid gland, which is an organ in the neck. People may also be exposed by breathing dust particles in the air that are contaminated with I-131. ![]() Human exposure to I-131 released from nuclear power plant accidents comes mainly from consuming contaminated water, milk, or foods. In the most severe kinds of accidents, such as the Chernobyl accident in 1986, other dangerous radioactive isotopes, such as strontium-90 (Sr-90) and plutonium-239, may also be released. The radioactive isotopes released in nuclear power plant accidents include iodine-131 (I-131), cesium-134 (Cs-134), and Cs-137.
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