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Radiation exposure should be ________.

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exposure to even tiny amounts of radiation is fatal  the effect of exposure to radiation is slow in coming  radiation is avoidable in space exploration  astronauts in spacesuits needn't worry about radiation damage  
exposure to even tiny amounts of radiation is fatal  the effect of exposure to radiation is slow in coming  radiation is avoidable in space exploration  astronauts in spacesuits needn’t worry about radiation damage  
exposure to even tiny amounts of radiation is fatal  the effect of exposure to radiation is slow in coming  radiation is avoidable in space exploration  astronauts in spacesuits needn’t worry about radiation damage  
exposure to even tiny amounts of radiation is fatal  the effect of exposure to radiation is slow in coming  radiation is avoidable in space exploration  astronauts in spacesuits needn't worry about radiation damage