A group of scientists at the University of California, San Francisco, is asking the federal government to clarify its calculations used in determining the health risks posed by full-body scanners. The group led by David Agard argues that the backscatter X-ray devices concentrate radiation in the skin, while official statistics average the radiation dosage for the entire body, thus understating the risk. But TSA officials continue to insist the technology is safe, pointing out that a single chest X-ray is equal to about 5,000 airport scans.

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