Director Brukhanov and the chief engineer of the plant initially insisted that whatever had happened had caused no radioactive releases, and local KGB officers took measures “to prevent the spread of panic-mongering, provocative rumors, and other negative manifestations.” In fact, radioactive contamination, carried on the wind and brought down by rain showers, had reached Pripyat and spread as far as fourteen kilometers from the plant. It included iodine 131, fragments of uranium dioxide fuel, and hot particles containing zinc 65 and zirconium-niobium 95 consistent with partial destruction of
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