文档介绍：1> Crooks tubes created free electrons by ionization of the residual air in the tube by a high DC volt age of anywhere between a few kilovolts and 100 伏和100千伏之间的高直流电压使管中的残余气体电离产生自 由电子。
2、 In many languages, X-radiation is called Rontgen radiation, after Wilhelm Conrad Rontgen, who is generally credited as its ，X射线称为伦琴 辐射，是在威廉康拉德后被众所周知的。
3、 The distinction bet ween X-rays and gamma rays has changed
in recent decades. Originally, the electromagnetic
radiation emitted by X-ray tubes had a longer wave1ength than the radiation emitted by radioactive nuclei(gamma rays). X射线和伽玛射线之间的区别在最近几十年里已经发生 了变化。原来，X射线管发出的电磁辐射的波长比由放射性原 子核所发出的辐射(y射线)长。
4、 The rad is the (obsolete) corresponding traditional unit, equal to 10 millijoules of energy deposited per (过时)对应的传统的单位，等于每公斤10 毫焦耳的能量沉积。
5、 The maximum energy of the produced X-ray photon is limited
by the energy of the incident electron, which is equal to the voltage on the 的最大能量有限，这就等于管上的电压。
6、 The radiologist or surgeon then compares the image obtained to normal anatomical images to determine if there is any damage or blockage of the 科医生然后将比较获得的正常的解剖图像，以确定是否有任何 损坏或堵塞的血管图像。
1> An X~ray can give all of its energy to an electron (a process called photo-electric absorption), or it can give some of its energy (a procss called Compton scattering), or it can scatter without losing any energy (a process called Rayleigh scattering). X光可以把所有的能量给电子(这一 过程称为光电吸收)，或者它可以给一部分能量(一个过程称为 康普顿散射)，或者它可以散射而不丢失任何能量(这一过程称 为瑞利散射)。
2、 Before the advent of the digital computer and before the invention of digital imaging, photographic plates were used to produce most radiographic images. 在数字计算机 的出现和数字成像发明之前，摄影板被用来产生X线影像。
3、 The part of the patient to be X-rayed is placed between
the X-ray source and the image receptor to produce a shadow of the internal structure of that particular part of the body.
部分做X线检查的病人在放射线源和影像接收器之间产 生一个特定的身体内部结构的一个影子。
4、 In modern hospitals a p