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一种Ｍ－型阴极具有两个限制寿命的因素：一个是浸渍剂的减少而另一个是表面涂层的退化。对于前者得出最佳工作温度和使用寿命对阴极电流密度。其次，通过比较这些测量结果和理论计算测定表面涂层的使用寿命定量的温度关系。这些因素的比较揭示当阴极工作在最佳温度上同时具有低于２４Ａ／ｃｍ２的电流密度时通过浸渍剂的减少测定一种涂覆浸渍阴极的使用寿命。
One M-type cathode has two life-limiting factors: one is a decrease in impregnant and the other is degradation of the surface coating. For the former, the best working temperature and lifetime for the cathode current density are obtained. Second, by comparing these measurements and theoretical calculations, the quantitative temperature dependence of the service life of the surface coating was determined. A comparison of these factors reveals that the service life of a coated impregnated cathode is determined by the reduction of impregnant when the cathode is operated at the optimum temperature with a current density of less than 24 A / cm 2 at the same time.