分析了采用不同率表电路的同位素仪表因放射源的衰减而对仪表测量误差的影响，得出了对仪表电路设计有参考价值的结论。
The influence of radioactive source decay on measuring error of the isotope instruments is analysed. The valuable conclusion for designing the circuit of instrument is obtained.
同位素测厚仪由放射源、探测器、控制仪表三部分组成。
Isotope thickness measurement instrument is composed of radial sources, detector and control instrument.
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