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Here's what a quick Google returned on exposure, "For example, in screening devices using backscatter x-ray, exposures are approximately 0.003 millirem (0.00003 mSv) per individual (Smith, 1995). This radiation level is so low that a passenger would have to go through the screening portal approximately 1,000 times to receive the same radiation dose as would be received from cosmic ray exposure at high altitude during one transcontinental flight from New York to Los Angeles. ".
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"Act as if the future of the universe depends on what you do, while laughing at yourself for thinking that your actions make any difference."
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