本文介绍用于放射性核素活度绝对测量的相关方法的基本原理、应用及其优点。亦介绍用测量射线在探测器内产生的电荷量代替常规测量电压脉冲数，最后给出样品绝对活度的新方法。方法的出发点是企图避开死时间校正问题。

This paper describes the principle and application of correlation method in the absolute radioactivity measurement. This new method measures the quantity of charge occurring in the detectors instead of the number of voltage pulse and then calculats the correlative quantity of the charge between two channels. Finally it gives the absolute activity of the measured sample. The purpose of this method was to make an attempt to decrease some trouble raised from dead time correction.