We all know that radiation is bad for our health. People usually don’t want to get too many x-rays in their lifetime, or they don’t want to live next to any nuclear power plants.

However, The Transportation Security Administration began installing full-body scanners in American airports. Since passengers have noticed this device, they are very concern about their privacy and health, because under the x-ray, everything is visible.

For privacy concerns, it is true that the machine is able to see the image of our body. However, for health concerns, according to an article published online Monday in the Archives of Internal Medicine, there’s no significant threat from the full-body scanners. Although they use ionizing radiation, which is known to cause cancer, the amount is so low. It is less than 1% of the additional radiation a person gets from flying in an airplane and the same we received through 3 to 9 minutes of daily life on the ground.

“If individuals feel vulnerable and are worried about the radiation emitted by the scans, they might reconsider flying altogether since most of the small, but real, radiation risk they will receive will come from the flight and not from the exceedingly small exposures from the scans,” wrote the authors, Pratik Mehta of UC Berkeley and Dr. Rebecca Smith-Bindman of UC San Francisco.