N a radioisotope of radon that is a decay product of thorium. Symbol: Tn or 220Rn; atomic no: 86; half-life: 54.5s 钍射气
Methods By using the negative high voltage exhaled thoron progeny measurement system.
方法采用负高压呼出气中子体测定装置。
It was successfully used to automatically determine the concentrations of radon and thoron daughters in air.
用它测定空气中气氡(气土)子体浓度获得良好结果。
The indoor thoron concentration in some areas and some kind of houses is higher, the study in this field should be strengthened.
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。
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