*sigh* ...
alright, science incoming: This is either backscatter X-Ray or millimeter wave imaging, if it's millimeter wave (which are basically radio waves) it's absolutely harmless. If it's backscatter X-Ray it's still harmless. These are not the X-Ray machines used to scan luggage, those are dual-energy (low and high) X-Ray systems, they either absorb, scatter or let the X-Rays pass through, a computer combines the two patterns to create an image. backscatter X-ray works in a very different way, the energy level is very specific, the dose is low and most of the radiation is not absorbed, it is scattered, hence the name, because your body is mostly made out of stuff with low atomic numbers which scatter X-Rays and do not absorb them. the side effect: very high resolution images of organic materials (read: your body)
only ABSORBED radiation is harmful, in a typical backscatter X-Ray scan you get about 0.005-0.010 mrem, up to 25 mrem per year is considered safe or the equivalent of 2500-5000 of these scans (per year). You get more exposure from background radiation in two days than you get from over a hundred of these scans ..
