我国有些地区和某些类型住房中钍射气浓度较高，有必要加强这一问题的研究。
The indoor thoron concentration in some areas and some kind of houses is higher, the study in this field should be strengthened.
方法用高灵敏度负高压人呼出气中钍射气子体收集测量系统对每名被检矿工测定其肺内钍的沉积量。
Method By using high sensitive negative voltage exhaled thoron progeny collection and measurement system, the thorium lung burdens of each dust exposed miner was obtained.
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