As he is already dead, it won't be radiation that killed him. Radiation poisoning needs days to do its ugly work. For the person to die within hours, the contai

As he is already dead, it won't be radiation that killed him. Radiation poisoning needs days to do its ugly work. For the person to die within hours, the containment must have failed to allow sufficient radiation out. Since this has not happened, the person in question hasn't died from radiation.