Those crazy new body scanners may seem scary, but they’re nothing compared to the radiation we get from the air, from space, even from within our own bodies all the time. Going through a scanner provides a dose of radiation equivalent to about two minutes of standing on the sidewalk. In fact, you’d need more than 22,500 scans in a year to reach the standard maximum safe yearly dose set by the American National Standards Institute and the Health Physics Society.
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