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。

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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。

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This paper reports absorbed dose rate in air for natural radiation and concentration radionuclides for food.

报导安徽省天然辐射的空气吸收剂量率和饮食中天然放射性核素的浓度。

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Dr. GERBER: It's approximately four times the natural radiation dose that we all receive annually in the Unites States, as a result from background radiation due to radon and other materials.

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