Then in the '70s came aircraft hijackings, and metal detectors, X-ray machines for carry-ons and uniformed security people became fixtures at airports. As terrorists replaced mere hijackers in the escalating pantheon of threats, pat-downs, ... in ConsumerTraveler.com, Ned Levi weighed the benefits of supposedly increased security with potential health risks of additional X-rays on the human body. Scientists have set 25mrem as the upper limit for safe annual radiation ...
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