深埋地热水中放射性核素铀、镭、钾的含量决定了医疗热矿水的类别和用途。为探讨围岩介质中铀、镭、钾的析出特征，以寒武系灰岩为介质，进行了室内静态模拟实验，并分析了不同温度和时间对铀、镭、钾析出的影响。结果表明，温度是影响放射性核素²³⁸ U、²²⁶Ra、⁴⁰ K释放的重要因素，随着温度升高，水中放射性核素的含量显著增加；浸泡时间对⁴⁰ K的影响较小，但对²³⁸U的影响显著，呈现出快速释放和缓慢释放两个阶段。²²⁶ Ra的释放速度与元素初始含量密切相关，含量越高，释放越快，反之亦然。实验还发现，Ca²⁺和的增加促进了²²⁶Ra的沉淀析出，而Cl^-则有利于²³⁸U的沉淀。总溶解固体（total dissolved solids, TDS）和电导率的增加有助于铀、镭、钾的析出，但pH的变化可能限制它们的析出。

The content of radioactive nuclides, such as uranium (²³⁸ U), radium (²²⁶ Ra), and potassium (⁴⁰ K), in geothermal waters determines the classification and use of therapeutic thermal mineral waters. To investigate the precipitation characteristics of uranium, radium, and potassium in the surrounding rock medium, static laboratory experiments were conducted using Cambrian limestone as the medium. The effects of different temperatures and durations on the precipitation of these elements were analyzed. The results show that temperature is a significant factor influencing the release of radioactive nuclides ²³⁸U, ²²⁶Ra, and ⁴⁰K. As the temperature increases, the concentrations of radioactive nuclides in the water increase significantly. The soaking time has little effect on the release of ⁴⁰K but significantly influences ²³⁸U, which undergoes rapid and slow release phases. The release rate of ²²⁶Ra is closely related to the initial concentration of the element; the higher the concentration, the faster the release. The experiment also found that the increase of Ca²⁺ and promoted the precipitation of ²²⁶Ra, while Cl^- favored the precipitation of ²³⁸U. The increase in total dissolved solids (TDS) and conductivity facilitated the precipitation of uranium, radium, and potassium, while changes in pH may limit their precipitation.