Some of these radioactive particals spill out in the immediate area of the explosion soon after it occurs, but others may be carried by the upper winds for many miles. Sooner or later, however, they settle to earth. This is called fallout. The Whole World is Radioactive But normal amounts are not dangerous. It is only when radioactivity is present in highly concentrated amounts, such as those created by atomic and hydrogen bomb explosions, that it becomes dangerous.
Radioactive fallout is sometimes highly concentrated.
Yes, it could settle anywhere. The upper winds could carry fallout to most remote parts of the country. Every citizen is a potential target for fallout. Civil Defense officials and weather experts will estimate the probable path and speed of approaching fallout and keep you posted. Civil Defense radiological monitoring teams will detect fallout if it is present in your area.