reference radiation level

例句：

1. 1. The study aimsto establish a reference radiation levelfor the contaminated area.
   该研究旨在为受污染地区建立参考辐射水平。
2. 2. The government has set a reference radiationlevel for drinking water safety.
   政府已设定饮用水安全的参考辐射水平。
3. 3. The researcher used a reference radiationlevel to measure the effectiveness ofthe treatment.
   研究者使用参考辐射水平来测量治疗的有效性。