阻止本领比值是空腔电离理论中的一个最基本的参数。阻止本领比值的不确定度是照射量基准或用电离法测吸收剂量的基准装置中最大的一项不确定度,所以最近许多作者对阻止本领比值作了精确的计算。但是受到空腔理论本身的限制及平均激发电位数值不一致的影响,使得计算结果各不相同。我们采用怀特(Whyte)介绍的方法,对阻止本领比值做了实验测定。但对实验数据采用了与怀特不同的计算方法。我们用多项式拟合实验点,再在某个气压下,就各种材料电离室的电离电流 The ability to stop the ratio is one of the most basic parameters in the theory of cavity ionization. The level of uncertainty that is preventing this ratio is the one of the largest of the baseline or ionization methods used to measure the absorbed dose, so many authors recently calculated the ratio of blockers accurately. However, due to the limitation of the cavity theory and the inconsistency of the values ​​of the average excitation potentials, the calculation results are different. We use the method introduced by Whyte, to test the ratio of the ability to stop the experiment. However, the experimental data used with White different calculation methods. We use polynomials to fit the experimental points, and then under a certain pressure, ionization chamber of a variety of materials on the ionization current