《英文msh詞典》X-Radiations
[入口詞] X-Radiations
[主題詞] X-Rays
[英文釋義] 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.