北京谱仪BES辐射本底水平是由大厅内的辐射水平决定的。
The radiation background of BES detector depends on the radiation level in the BES experimental hall.
目的对南水北调东线山东段通水前沿线流域的放射性本底水平进行评价。
Objective To assess the radiation background levels of Shandong basin in east line of northward rerouting of southern river.
调查结果表明，上海市各类水体中天然放射性核素浓度属正常本底水平。
The results show that the radioactivity level of varied water bod-ies of the city was within normal natural background.
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