natural radioactivity level 天然放射性水平
artificial radioactivity level 人工放射性水平
measurement of low level radioactivity 低水平放射性测量
low level radioactivity 低水平放射性测量
low-level radioactivity 低水平放射性测量
high-level radioactivity sludge 高放泥浆
low level radioactivity measuring 低水平放射性测量
low-level radioactivity measurement 低水平放射性测量
Objective To research and assess radon concentration and radioactivity level of part coal mine in Guizhou province.
目的研究和评价贵州省地下煤矿氡气浓度和放射性水平。
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，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 bodies of the region 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。
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