Originally Posted by
gonzalu
I don;t think so but they CAN ... With backscatter, it is simply a matter of adjusting the intensity of the beam and the sensitivity of the receiver. At work, X rays and Gamma rays are used all the time (medicine) and I can tell you GE and Siemens have REALLY GOOD sensors and I have seen them being clinically trialed here. There is a dermatology scanner being tested to detect microscopic sub layers of the skin to detect small skin cancers before they spread. They can dial in microns in 3D from the surface to the bone if they wanted to... all in color and 3D. The sensor is still small, about 2 1/4 inch but they expect to make it bigger. This one is not backscatter but it can be as I have been told.
The ink in Tattoos are radioactively different enough from clear skin to make it visible from surrounding tissue.