Well, should it? How liable was the fallout on ground to move and go elsewhere? The Zone was evacuated. But then large number of people were sent to clean the surface. Sending people to clean the surface exposed them to radiation. If they had not been sent there, and the fallout had been left where it fell, would the fallout have moved to expose more people outside the Zone than the people sent into the Zone to clean it? Do you think Chernobyl was cleaned correctly, cleaned too much, or not cleaned enough?