“X射线”又称伦琴射线,它是一种波长很短的电磁辐射.波长越短的X射线能量越大,叫做硬X射线,波长长的X射线能量较低,称为软X射线.当在真空中,高速运动的电子轰击金属靶时,靶就放出X射线,放出的X射线分为两类:如果被靶阻挡的电子的能量不越过一定限度时,只发射连续光谱的辐射,这 X-ray, also known as x-ray, is a type of electromagnetic radiation with a short wavelength, the shorter the X-ray energy is, the harder it is called X-rays and the longer the X-rays energy is. When a high-speed moving electron bombards a metal target in a vacuum, the target emits X-rays and the emitted X-rays fall into two categories: if the energy of the electron blocked by the target does not exceed a certain limit, it emits only continuous spectrum of radiation, This