Science: Radiation Belt
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The radiation zone is by no means a "death belt" that will keep humans from reaching space, but it might do some damage to men who live for a long time in a satellite. Van Allen figured that the radiation level inside the satellite might reach about 0.06 roentgens per hour. At this rate a man would receive in five hours his maximum weekly permissible dose of 0.3 roentgens. A small amount of lead shielding would reduce the dose to a supportable level. The crew of an outbound spaceship need not worry about the radiation belt. If moving fast enough to leave the earth, they would pass through it in about 20 minutes.
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