A new analysis finds that full-body airport scanners don't pose a significant health risk to passengers.

The article, published online Monday in the Archives of Internal Medicine, estimated the potential risks of the radiation emitted from so-called backscatter X-ray scanners, a commonly used machine. The Transportation Security Administration has installed nearly 500 full-body scanners in U.S. airports with an estimated 1,000 scanners to be installed by the end of the year.

Rebecca...