入射窗所对应的实物光阑就是所要求的场光阑。
The physical stop which corresponds to the entrance window is then the required field stop.
这些X射线相机设备是由一台X射线图像增强器和一台CCD相机构成的。其中，X射线入射窗的窗材是铝或铍。
These are X-ray camera units comprised of an X-ray image intensifier and a CCD camera. The X-ray input window is made of aluminum or beryllium.
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