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.
调查结果表明，宁夏回族自治区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 bodies of the region was within normal natural background.
大理石的天然放射性属于环境本底水平，花岗岩中放射性远远高于大理石产品。
Natural radioactivity in the marble is equal to the environmental level, radioactivity in the granite is much higher than that in marble.
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