For Frequent Fliers, How Big a Concern Is Backscatter...
Clip: 12/01/2011 | 11m 7s
As millions of Americans take to the skies for holiday travel, some scientists have raised concerns about the small dose of ionizing radiation emitted by backscatter full-body scanners used to screen passengers at U.S. airports. In partnership with ProPublica, Miles O'Brien examines what we do and don't know about the machines.
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