Quote Originally Posted by KnottedYet View Post
The old machines are not x-ray.

They are magnetic induction (or something like that). They pick up the electromagnetic distortions caused by metal going through the field they generate. Metal detectors, not x-ray.

I don't get why airports are suddenly putting in the x-ray backscatter when the other new option (mm wavelength machines) are just as accurate, cheaper, and have no radiation concerns.
Oops, sorry. X-ray is the plebian "I don't know what exactly that is but we generically refer to it as 'x-ray' version"