中文摘要：

室内氡气体衰变产生短寿命氡子体，其子体的行为受室内换气状况、墙壁附着、子体同气溶胶粒子结合等物理过程的影响，宏观表征是未结合态份额和平衡因子受换气率、气溶胶浓度及气溶胶粒径分布状况等参数的影响。本文通过建立模型对室内氡子体行为进行了理论研究，重点考虑了换气率、气溶胶状况对未结合态份额和平衡因子的影响。计算结果表明平衡因子随换气率的增加而迅速减小，未结合态份额随气溶胶粒径分布的减小而迅速增加，气溶胶浓度只有在非常低的情况下才对未结合态份额和平衡因子产生明显影响。

英文摘要：

The behavior of indoor radon decay products is influenced by ventilation rate, wall deposition, attachment to the aerosol and so on. All this progresses work on the unattached fraction of radon progeny and the equilibrium factor F. Our research focuses on the model of indoor radon decay products behaviors. Through a theoretical model, the influence of ventilation rate, the size distribution of aerosol and the concentration of aerosol on the unattached fraction and also the equilibrium factor are described. The research shows that the equilibrium factor decreases with the increase in ventilation rate increase, and also shows that the unattached fraction increases quickly with the decrease in the size distribution of aerosol.