ABSTRACT
Ranked by decreasing wavelength, X-rays or Roentgen rays (also pronounced “Rantken”) occupy the high frequency part of the electromagnetic spectrum in the series comprising radio waves, infrared light, visible light, ultraviolet light, soft and hard X-rays, and gamma radiation. X-rays were rst articially produced by stopping electrons in glass and other material. us, the notion bremsstrahlung (brake radiation) was proposed by A. Sommerfeld with the consent of Roentgen and derived from the German verb bremsen (to brake)
and the noun Strahlung (radiation); (see Haug and Nakel 2004), who treat the elementary processes in great detail.
