Assertion: potassium iodide's iodine | /r/HasProperty | iodine-131 isotope
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text: According to the Union of Concerned Scientists, a nonprofit group in Cambridge, Mass., the radioactive materials that pose the greatest threat after a nuclear power accident are radioactive iodine (the iodine-131 isotope, in particular) and radioactive cesium (cesium-137), and news reports have said both have been detected outside the plant.