X rays pass easily through air and soft tissue of the body. When they encounter more dense
material, such as a tumor, bone, or a metal fragment, they are stopped. Diagnostic x rays
are performed by positioning the part of the body to be examined between a focused beam of
x rays and a plate containing film. This process is painless. The greater the density of
the material that the x rays pass through, the more rays are absorbed. Thus bone absorbs
more x rays than muscle or fat, and tumors may absorb more x rays than surrounding tissue.
The x rays that pass through the body strike the photographic plate and interact with silver
molecules on the surface of the film. Download the nice live wallpaper