Two test methods, natural radioactive background method and decay method, used to verify the detection limit of radioactive aerosol monitors are studied.

研究了放射性气溶胶监测仪的检测方法，即天然本底检测法和衰变检测法。

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This paper completely introduces the investigation of environmental radioactive background level before the commissioning of power plant and environment monitoring system of power plant.

文中较全面地介绍了电站运行前的环境放射性本底水平调查和电站的环境监测系统。

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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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Besides their headline findings, these reports also highlight a highly important yet radioactive issue that lurks in the background of contemporary immigration debates.

FORBES: Opening U.S. Doors Could Be a Life or Death Proposition