Both of them belong to the common methods of imaging examination, which can be applied not only in the medical field, but also in many other fields, such as industry.
The mechanism of (1) is different: X-rays are excited by electrons inside atoms; Dx rays are stimulated by nuclear radiation; (2) Photon energy is different: the photon energy of dx rays is higher than that of X rays, so the frequency of dx rays is higher and the wavelength is shorter; (3) Different penetrating power: Both of them have penetrating power, but dx rays have shorter wavelength and stronger penetrating power.