各种X射线衍射装置中采用的入射束准直管,都是以带针孔的铅薄片制成。这种传统结构中有两点无法克服的缺陷,限制了它的使用。一是针孔直径受到加工条件的限制,不能太细;二是穿过准直管的X射线束强度受到准直管直径大小的极大制约。为了解决这一问题,使用锥形毛细管便可获得μm The incident beam collimation tubes used in a variety of X-ray diffractometers are made from lead sheets with pinholes. There are two insurmountable deficiencies in this traditional structure that limit its use. First, the pinhole diameter is limited by the processing conditions, not too fine; Second, the strength of the X-ray beam passing through the collimator is greatly restricted by the diameter of the collimator. To solve this problem, the use of tapered capillary tube can be obtained μm