Analogy is a inference method ,according some properties of a class of things to inferring the similar things should also have the similar properties .The analogy of same radionuclides is widely used in radioisotope logging environment impact assessment so far .This paper is to provide fFor future providing a theoretical calcu-lation method and analogy method between different radionuclides in radioisotope logging environment impact as -sessment.In this paper,using the latest decay scheme ,through theoretical modeling ,the aim is the the estab-lishment of 131 Ba and 131 I radioisotopes gamma radiation dose rate calculation method ,and try to carry out analo-gy research on gamma radiation dose rate of different radioisotopes with the same activity .The results show that the analogy of different radionuclides is feasible ,which provides the new method reference for carrying out such radiation environmental impact assessment in future .%为在放射性同位素测井环境影响评价方面提供理论计算方法和不同核素间类比方法，运用最新的decay衰变纲图，通过理论建模，建立了放射性同位素131 Ba和131 I的γ辐射剂量率理论计算方法，并尝试开展不同放射性同位素间相同活度的γ辐射剂量率类比方法研究。结果表明，不同类别间放射性同位素进行类比是可行性，这为今后开展此类辐射环境影响评价提供了新的方法借鉴。
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