Passive mm-wave scanners do not produce radiation. The active mm-wave scanners use non-ionizing radiation which has been studied and shown not to cause cancer.

Passive mm-wave scanners do not produce radiation. The active mm-wave scanners use non-ionizing radiation which has been studied and shown not to cause cancer. One study even suggested it might reduce metastasis: http://onlinelibrary.wiley.com/doi/10.1002/bem.20208/abstract http://onlinelibrary.wiley.com/doi/10.1002/bem.20208/abstrac... The flight itself isn't even that bad, but it is worse than the scanners. You get maybe 5 mrem (50 µSv) flying from London to NYC. http://hps.org/publicinformation/ate/faqs/commercialflights.html http://hps.org/publicinformation/ate/faqs/commercialflights.... The flight radiation is something you'd want to avoid, but a single flight is almost insignificant. XKCD has a reference chart: http://xkcd.com/radiation/ http://xkcd.com/radiation/ Flight radiation is mostly a concern for flight crew.