are an "extremely low" source of radiation exposure that poses
virtually no health risk, not even to frequent air travelers, U.S.
researchers said on Monday....
"There is such a vast difference between
super-low doses of radiation and the really high doses that happen if
you are in the middle of a nuclear accident," said Dr. Rebecca
Smith-Bindman, a radiology professor at the University of California,
San Francisco, whose study appears in the Archives of Internal Medicine.
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