![]() ![]() Radioactive fallout poses the greatest threat to people during the first two weeks, by which time it has declined to about 1 percent of its initial radiation level. 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. ![]() Flat roofs collect fallout particles so the top floor is not a good choice, nor is a floor adjacent to a neighboring flat roof. A floor near the middle of high-rise may be better, depending on what is nearby at that level on which significant fallout particles would collect. 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.
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