X-rays are used in medical diagnostics, mainly based on the penetrating effect of X-rays, differential absorption, sensitization and fluorescence. As X-rays through the human body, by different degrees of absorption, such as the amount of X-rays absorbed by the bone than the amount absorbed by the muscle, then the amount of X-rays through the human body is not the same, so that it carries the density distribution of the human body parts of the information in the fluorescent screen or photographic film caused by fluorescence or photographic effect of the strength of the role of a greater difference, and therefore in the fluorescent screen or photographic film (after the development of the finalization ) will show a different density of shadows. According to the contrast of shadow density, combined with clinical manifestations, laboratory results and pathological diagnosis, you can judge whether a part of the human body is normal.
Because X-rays have a strong penetrating power, in addition to the medical use of it, in the industry also use X-rays to do industrial flaw detection. X-rays can be excited by fluorescence, ionization of gases, photographic latex photographic, X-rays can be used in ionization meters, scintillation counters, and photographic latex film and other detection.