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根据核子秤的基本原理和计量物料的实际情况，对采用长棒辐射源（下称长棒源）和长电离室可以减小核子秤的辐射源活度这一方法进行了理论分析和静态比较实验。实验结果表明：在不降低计量精度、使用长电离室的情况下，这一方法可以把核子秤的辐射源活度由原来的３．０—３．７ＧＢｑ减小到３７０ＭＢｑ左右。
According to the principle of nuclear scale and the actual situation of material measurement, theoretical analysis and static comparison of the method using the long rod radiation source (long rod source) and the long ionization chamber can reduce the activity of the nuclear scale radiation source experiment. The experimental results show that this method can reduce the activity of the nuclear scale radiation source from 3.0-3.7GBq to 370MBq without reducing the measurement accuracy and using the long ionization chamber.