Radon is considered a significant contaminant that affects indoor air quality. Neutralization is one of the most important environmental factors in changing pore structure of cement-based materials that may release radon. Therefore, it is necessary to study the radon exhalation of cement-based materials impacted by neutralization, which is extremely lacking. Some concrete blocks were accelerated to neutralization by soaking in sodium bicarbonate solution, and the radon activity concentrations over the blocks were measured to investigate the effect of neutralization on radon exhalation. Controlled experiments were conducted with blocks in the initial dry state and soaked in pure water. The results show that the radon activity concentration exhaled from block is promoted by neutralization, and the promoting role of water is quite limited. The radon surface exhalation rate increases by increasing the sodium bicarbonate solution concentration from 0.5% to saturation.

中文翻译：

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浸泡法加速中和对水泥基材料氡析出量的影响。


氡气被认为是影响室内空气质量的重要污染物。中和是改变可能释放氡的水泥基材料的孔隙结构的最重要的环境因素之一。因此，有必要对受中和影响的水泥基材料氡析出量进行研究，而这方面的研究十分缺乏。采用碳酸氢钠溶液浸泡的方法加速混凝土块体的中和，并测量混凝土块体上的氡活度浓度，研究中和对氡析出量的影响。对处于初始干燥状态并浸泡在纯水中的块进行对照实验。结果表明，中和作用对区块呼出的氡活度浓度有促进作用，而水的促进作用相当有限。通过将碳酸氢钠溶液浓度从0.5%增加至饱和，氡表面呼出率增加。