Two test methods, naturalradioactivebackground 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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For most people more than half of their naturalbackground radiation dose comes from radon, a radioactive gas that can accumulate in homes, schools and workplaces.