Using total X ray reflection Technique, the monochromatic X ray can be formed. When the monochromatic characteristic X ray is used as a exciting samples, the backgrounds of X ary Fluorescence spectrometer ( XRF) is much reduced and the high sensitivity of XRF is achieved. 用X射线全反射技术可以使X射线单色化,用这种单色化的特征X射线作为激发源可以大大降低X射线荧光光谱仪的本底信号,提高仪器的检测灵敏度。