Comment Re:I fly all the time (Score 2) 487
I submitted this story a few months ago, but it wasn't picked up, so I guess now will be good time to recount the main facts:
A single scan is equal to 3-9 minutes of natural background radiation exposure and would raise the amount of radiation a person is exposed to on a 6-hour intercontinental flight by about 1%. As for cancer risk, 1 million people flying 10 times a week will have 4 additional cases of cancer (using current models of radiation-cancer association). This is compared to the 600 cases of cancer they will get from the flight itself and to the 400,00 cases these people will have over their lifetime.
I can't find the full article anymore (paywall), but the abstract is here [ama-assn.org]. It is interesting to note that the authors also wrote this:
In medicine, we try to balance risks and benefits of everything we do, and thus while the risks are indeed exceedingly small, the scanners should not be deployed unless they provide benefit—improved national security and safety—and consideration of these issues is outside the scope of our expertise.
The article also points out that since TSA officials do not allow outside scrutiny of the actual radiation levels of the machines, we cannot know if they perform as intended or if they expose us to more radiation. But still, I think they are probably a lot safer than you would have thought.