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    Through a series of accidents and spills, the Russian nuclear facility at Mayak contaminated more than 15,000 km² with highly radioactive waste. In
 
     
    The explosion of a nuclear reprocessing facility in Tomsk-7 dispersed large amounts of radioactivity over an area of 120 km², exposing tens of
 
     
     
     
     
     
     
     
     
     
     
     
     
    