Comment Re:Health risk (Score 1) 313
The reflection of the x-rays is actually greater for skin than metal due to the elements--hydrogen, oxygen, and carbon shine brighter than iron. That's the basic trick used, to be able to see through higher number elements such as metals by looking only a type of relection called Compton Scattering. I did some more reading and I was _wrong_ about the penetration of the skin. The reason the risk is low is just that not much x-ray is used.