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1·This is called natural background radiation.

这称为自然环境辐射。

2·But natural background radiation is more than 100,000 times the highest levels detected.

但其检测量大大高于自然本底辐射量一万倍。

3·But natural background radiation is more than 100, 000 times the highest levels detected.

但其检测量大大高于自然本底辐射量一万倍。

4·For most people more than half of their natural background radiation dose comes from radon, a radioactive gas that can accumulate in homes, schools and workplaces.

对大多数人来说，他们自然环境辐射剂量的一半以上来自氡—一种可聚集在家庭、学校和工作场所的放射性气体。

5·Radiation doses to humans may be characterized as low-level if they are comparable to natural background levels.

对人类的放射剂量如果与自然环境辐射水平相比属低水平。

6·These levels of natural and background radiation is normal.

但这些都只是正常辐射。

7·These results have provided useful bases for recommending reference dose of related natural radiation exposure, parameters of Chinese reference Man and background value of radiation monitoring.

这些结果为推荐我国天然辐射剂量参考值、我国参考人相应参数和辐射监测背景值提供了有用依据。

8·Objective To estimate the excess relative risk for solid cancer associated with chronically exposure to high-background natural radiation in Yangjiang area of China.

目的估算阳江高本底辐射慢性照射可能导致的实体癌超额相对危险。