用电子探针定量测定粉末样品,有速度快、取样量少,信息量大的优点,但同时也存在着均匀性不好,计数率偏低的问题。针对这一情况,我们采用水泥、玻璃、白云石样品[1],从观察其粒度配比开始,研究了粒度及压片压力对X射线计数率的影响,取得了较满意的结果。实验部分1.实验仪器　日 The quantitative determination of the powder sample by the electron probe has the advantages of high speed, small sampling amount and large amount of information, but also has the problem of poor uniformity and low counting rate. In view of this situation, we use cement, glass, dolomite samples [1], starting from the observation of the particle size ratio, the effects of particle size and tableting pressure on the X-ray count rate, and achieved satisfactory results. Experimental Part 1. Experimental Instrument Day