The three factors must be taken into consideration to reduce radon concentration to a reasonably acceptable level so that the uranium well can be kept in its best working condition with minimum radiation.

• 为了把铀矿井平均氡浓度降到一个合理的可接受水平,必须对这三个因素综合考虑,使铀矿井处于最佳工作状态和最优的辐射水平。