I would definitely opt out and let the paedophilic sick minions of the TSA get their kicks rather than potential DNA damage. These rays can damage DNA there is no doubt as there is no such thing as safe radiation, its all cumulative. And I would especially worry about kids.
The whole idea of the TSA would be laughable if it wasnt so potentially damaging and so degrading. And it is only going to get worse as they move to sport venues, bus stations, train stations and highways. I think my nick explains my position well enough.
Microwaves can cause sickness, including cancer, and that wavelength hasn't been studied enough to know how dangerous it is. Robert Becker's discussion of the dangers in Body Electric is worth reading.