In time, you will be able to leave the fallout shelter.
Time - fallout radiation loses its intensity fairly rapidly. Shielding - the heavier and denser the materials - thick walls, concrete, bricks, books and earth - between you and the fallout particles, the better. An underground area such as a home or office building basement offers more protection than the first floor of a building. Distance - the more distance between you and the fallout particles, the better. 
The three factors for protecting oneself from radiation and fallout are distance, shielding and time. However, terrorism, by nature, is unpredictable. The danger of a massive strategic nuclear attack on the United States is predicted by experts to be less likely today.
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