Looks like radiation is probably the least concern. Everyone agrees you'll get much more from the flight than the scanner.
"... "We feel the amount of radiation is so negligible, that it has no impact whatsoever on health," said Luis Casanova of the Transportation Security Administration.
The TSA says going through the full-body scanners amounts to the same radiation as one one thousandth of a chest x-ray. A private physicist found it up to ten times that amount. Or one one-hundredth of a chest x-ray.
Others say the real effects just aren't known because they haven't been adequately studied.
So what's the truth?
Michael D. Story, Ph.D. is an associate professor at UT Southwestern Medical Center in Dallas in the Division of Molecular Radiation Biology, he does research on radiation for NASA.
His overall assessment of the scanners? "The risk in this case for cancer is extremely low. An individual should not be worried about that at all," Story said.
Story said the dosage from the body scanners is at least 200 times less than that a passenger receives during a typical airline flight.
In other words, he says, if you're not worried about the radiation you get flying, you shouldn't be worried about the radiation from the scanner..."