If you want to talk radiation, you get more being on the plane than being scanned. If you're paranoid about radiation then stay home and indoors, because you get radiation exposure every second outside. And you'd also have to avoid dentists. And Doctors. And God forbid using a microwave.
These body scanners use X-Rays to get their images. Those things doctors and dentists give you while standing in a whole other room. Those things that are on the high end of the EM spectrum, are blocked out by the Earth's ionosphere, are emitted by H-Bombs and are the ionizing radiation that can knock electrons off of mitochondrial DNA, causing damage to cells leading to cancer?
Your microwave? Uses (get this!) microwaves. Waveforms on the EM spectrum that are less powerful than light! Micorwaves are fare too big to damage cells enough to cause damage to DNA not to mention in a properly cared for and constructed microwave they're contained inside the Faraday-cage of the oven.
The sunlight? Contains A and B rays which are less powerful than X-Rays but more powerful than light so are capable of damaging cells. (We call it melanoma and sunburn. The former a serious condition but not deep enough to cause severe radiation in internal cells.)
X-Rays penetrate your body, go all the way through you and keep going. The destroy cells along their way. Microwaves aren't powerful enough to penetrate your first layer of skin.
Most good doctors are smart enough to not give their patients, especially young ones, older ones or those in poor health, X-Rays, Cat Scans, or other medical scans that involve high-frequency radiation because exposure to it is dangerous.
Yes, we're exposed to radiation no matter what. I'd prefer to not expose myself to not much more than the Alpha and Beta radiation I get from the sun considering it carries with it only a small chance of skin-cancer with normal exposure.
Now, yes, the X-Rays used by these scanners are on the lower-end of the X-Ray spectrum and probably still aren't greatly more dangerous than the Beta rays we get from the sun. But they are more powerful and they can cause cancer and I believe they may be the ones that "stack." (That's to say that you can only be exposed to so much of it over a lifetime and you can't "undo" or reverse exposure.)
We shouldn't be so cavalier about willing go through these X-Ray machines on the front of radiation. And comparing the radiation you get from a microwave and what you get from these scanners is like comparing being hit with a Nerf ball being tossed by a toddler and being hit with a hollow-point bullet shot from a sniper a quarter mile away.
They're apples and pomegranates. They're not comparable.
But forgetting any radiation danger, forget any privacy issues should we really be so willing to be held-up and searched to this degree in any manner just so we can "feel safe." (Because this is all it is, "feeling" safe; it's not making us safe.) As I've been saying in the TNZ thread all this is is mommy looking under the bed for monsters to try and make us feeling better.
Unfortunately the real concerns aren't under the bed but in the bushes down the street. But, hey, we "feel safer" right?
And the Rosa Parks analogy is apt. She didn't "have to" ride the bus. She could've walked, she could've ridden a bike, taken a cab, got a friend to drive her anything. It was the norm for black women to sit in the back of the bus! What's the big deal? How's the back of the bus any different from the front? How does it hurt her?
No. She defied the "norm" because of what she felt was right. What she thought was a stupid law and a stupid "norm." No different here. We shouldn't be so willing to shrug and put up this so we can "feel safe."
Apparently you posted this before reading my latest post. So I'll let you read that for science.
But I will tell you that thanks to an unshielded microwave, my mother wound up with thyroid issues.
Everything is right there in the links I gave.
Also, FYI the techs stand in different rooms because they perform x-rays all day.