钍射气

The sources and characters of thoron 220 Rn in the buildings, the pattern of indoor thoron 220 Rn's concentration and the assessment of hazard which it brings to human being are discussed,and the method of measurement of indoor thoron's concentration is expounded and the measure for reducing thoron 220 Rn in the buildings is also pointed out.

综述了建筑物内钍射气220 Rn 的来源和性质，讨论了建筑物内220 Rn 浓度的模型及其对人类的危害风险评估，探讨了建筑物内220 Rn 浓度的测量方法，提出了降低建筑物内220 Rn 浓度的措施。

The contents of 226Ra and 232Th of honeycomb briquette were used to calculate the contribution of honeycomb briquette burning to indoor radon and thoron and their radiation dose to the residents.

应用γ能谱测定了西安市蜂窝煤中天然放射性核素226Ra、232Th和40K的含量，并初步分析了取暖期蜂窝煤燃烧对室内氡及钍射气浓度的贡献，以及所致居民剂量。

By using high sensitive negative voltage exhaled thoron progeny collection and measurement system, the thorium lung burdens of each dust exposed miner was obtained.

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。

Radon and thoron calibration factors are 1.78 and7.63 respectively , the relative error of radon concentration ERS-2 measured is 3.0%compared to the standard radon concentration and thoron is 3.2%. We deduced theequations which can eliminate the mutual interference between radon and thoronmeasurement .

通过 ERS—2 氡析出率仪器的研究，对 ERS—2 测量析出率中道址的选择以及扣除氡钍干扰问题进行了讨论，氡道道址设置为 60—115，钍道道址设置为 119—128，氡钍的刻度系数分别选为 1.78 和 7.63，测得的氡浓度与标准氡浓度的相对误差为 3.0%，测得的钍射气浓度与标准钍射气浓度的相对误差为 3.2%。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。