【摘要】 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。更多还原

【Abstract】 The way using a long rod radiation source and a long ionization chamber to decrease the activity of radiation source for the nuclear weigh scale is analysed in terms of theory and the static comparison experiment is carried out, according to the basic principle and the actual situation. The experiment results show that the activity of 137 Cs radiation source for the nuclear weigh scale can be decreased from original 3.0-3.7 GBq to 370 MBq while the measuring precision is not reduced.更多还原