《英文msh词典》X Radiations
[入口词] X Radiations
[主题词] X-Rays
[英文释义] Penetrating electromagnetic radiation emitted when the inner orbital electrons of an atom are excited and release energy - in the same energy range as gamma rays (0.010-10 Mev),but of non-nuclear origin,of shorter wavelength than ultraviolet; soft x-rays or Grenz rays are less penetrating and longer in wavelength than hard x-rays.