The survey of natural radionuclide contents in soil in China(1983—1990)is a part of investigation of environmental naturalradioactivity level on China.
中国土壤中天然放射性核素含量调查（1983—1990年）是中国环境天然放射性水平调查研究的一部分。
2
The methods of urban environment's naturalradioactivity were investigated through abundances of experiments and field measurements.
通过大量的实验和野外测量，对城市环境天然放射性评价方法进行了研究。
3
The results show that there is a normal level of naturalradioactivity of soil in the Xiazhuang granite uranium ore field.