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The Deadly Van Allen Belts? - NASA

7 The Deadly Van Allen Belts? The numbers along the horizontal axis give the distance from Earth in multiples of the Earth radius (1 Re=6378 km). The Inner van Allen belt is located at about Re. The Outer van Allen belt is located at about Re. At a distance of Re, there is a 'gap' region in between these belts. Satellites such as the Global Positioning System (GPS) orbit in this gap region where radiation effects are minimum. The International Space Station and Space Shuttle, on this scale, orbit very near the edge of the blue 'Earth disk' in the figure, so are well below the Van Allen Belts.

Note: According to radiation dosimeters carried by Apollo astronauts, their total dosage for the entire trip to the moon and return was not more than 2 Rads over 6 days. The total dosage for the trip is only 16 Rads in 68.1 minutes. Because 68.1 minutes is equal to 1.13

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  Belt, Radiation, Allen, Ansas, Deadly, Dosimeter, Radiation dosimeters, The deadly van allen belts

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