Radon concentration in air is measured by the number of transformations per second in a cubic metre of air (Bq/m3)].
空气中氡的浓度按1立方米的空气中每秒转换的数量（Bq/m3）测定] 。
Radon concentration in air is measured by the number of transformations per second in a cubic metre of air (Bq/m3)].
空气中氡的浓度按1立方米的空气中每秒转换的数量（Bq/m3）测定] 。
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