To obtain a radon source that is easy to access natural radium-bearing raw material and does not require the approval of relevant departments, the tubular flow-through radon source using radium-bearing ore as the radon-generating material was designed. Based on the theories of radon diffusion-convection migration in porous media, the simplified calculation formula and numerical calculation models of radon activity concentration at the outlet of the tubular flow-through radon source were established, and the radon release rules of the tubular flow-through radon source were studied using a combination of simplified calculation formulas, numerical simulations, and experiments, respectively. The results show that (1) the radon activity concentration at the outlet of the tubular flow-through radon source was dominated by mass (or the volume) of the natural radium-bearing raw material, free radon production rate, and gas flow rate. (2) When the range of radon activity concentration at the outlet is 260–1308 Bq m-3, the relative deviation of the three methods is less than 2.62%. (3) The simplified calculation formula and numerical simulation method proposed in this paper can provide a reference for the design and control of the radon activity concentration of a tubular flow-through radon source.

中文翻译：

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天然含镭材料管式流通氡源氡释放行为研究

为了获得一种易于获取天然含镭原料且无需相关部门审批的氡源，设计了以含镭矿石为氡发生材料的管式流通式氡源。基于多孔介质中氡扩散-对流迁移理论，建立了管式流通氡源出口氡活度浓度的简化计算公式和数值计算模型，以及管式流通式氡源的氡释放规律。分别采用简化计算公式、数值模拟和实验相结合的方式研究了通过氡源的情况。结果表明：（1）管式流通氡源出口处的氡活度浓度受天然含镭原料质量（或体积）、游离氡产率和气体流量的影响。 (2)当出口氡活度浓度范围为260~1308 Bq m-3时,三种方法的相对偏差小于2.62%。 (3)本文提出的简化计算公式和数值模拟方法可为管式流通氡源氡活度浓度的设计和控制提供参考。