Radon-containing water bodies in uranium mining areas inevitably release radon gas, polluting the surrounding environment via radiation. Thus, it is particularly important to develop devices with the ability to retard the radon release from such water bodies. Based upon theories of radon exhalation in water, a radon exhalation retardation device (RERD) with flexible, modular floats (a flexible polyvinyl chloride material module that floats on water) was designed and manufactured. To study the modular surface-covering floats’ effectiveness in retarding radon release from water surfaces, an experimental setup was constructed to simulate radon release from water bodies, using a granular uranium ore sample from a uranium mine as sediment material. Closed-loop measurements were taken to determine the radon exhalation rate on the exposed surface of the water in uncovered and covered conditions. Radon retardation rates were also compared for different area coverage (29.6%, 59.1%, and 88.7%) and immersion depths (0.02 m and 0.04 m) in unperturbed and perturbed water bodies. The results show that: 1) the greater the area coverage, the greater the radon retardation rate in both unperturbed and perturbed water bodies; 2) under the same coverage conditions, the surface radon exhalation rate and the radon transfer velocity at the gas-liquid interface of the perturbed water are larger than those of the unperturbed water; 3) The immersion depth of modular surface-covering floats has a stronger effect on the radon retardation rate in unperturbed water bodies than in perturbed water bodies. The study shows that the proposed modular floats are effective in retarding radon release from both perturbed and unperturbed water bodies.

铀矿区含氡水体不可避免地释放氡气，通过辐射污染周围环境。因此，开发能够延迟氡从此类水体释放的装置就显得尤为重要。基于水中氡析出理论，设计并制造了一种带有柔性模块化浮子（漂浮在水面上的柔性聚氯乙烯材料模块）的氡析出延迟装置（RERD）。为了研究模块化表面覆盖浮子在阻止氡气从水面释放方面的有效性，使用来自铀矿的粒状铀矿石样品作为沉积物材料，构建了一个实验装置来模拟水体中的氡气释放。进行闭环测量以确定裸露和覆盖条件下暴露的水面上的氡析出率。还比较了未扰动和扰动水体中不同面积覆盖范围（29.6%、59.1% 和 88.7%）和浸入深度（0.02 m 和 0.04 m）的氡延迟率。结果表明：1）覆盖面积越大，未扰动水体和扰动水体的氡滞留率越大；2)相同覆盖条件下，扰动水的表面氡析出率和气液界面氡传递速度均大于未扰动水；3) 模块化表面覆盖浮子的浸入深度对未扰动水体中的氡阻滞率的影响大于扰动水体中的氡阻滞率。研究表明，所提出的模块化浮子可有效阻止受扰动和未受扰动水体中的氡气释放。