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模块式高温气冷堆ＭＨＴＧＲ（简称模块堆）一回路冷却剂氦气中放射性核素浓度的计算是辐射防护设计和环境影响评价的基础。本文根据模块堆一回路氦气中放射性核素的来源和去除机制导出了氦气中放射性核素浓度的计算方法，并得出解析解的计算公式。
Modular High-Temperature Gas-Cooled Reactor MHTGR (Reactor for Module Reactor) The calculation of the radionuclide concentration in the helium of a primary coolant circuit is the basis for radiation protection design and environmental impact assessment. In this paper, the calculation method of radionuclide concentration in helium is deduced according to the source and removal mechanism of radionuclide in helium in the first loop of the module stack, and the analytical formula of analytic solution is obtained.