Radon gas in the air is present worldwide, its concentration depending on the highly variable uranium content of the soil.

在世界各地，空气中都存在氡气，其浓度取决于土壤中差别极大的铀含量。

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The authors also studied the continuous self-recording technique by using the ionization method to measure the Radon gas.

并对应用电离法测量逸出气氡的连续自记观测技术进行了预研究试验。

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Radon gas in the environment, particles of the fire-resistant material asbestos and air pollution also increase the risk.

环境中 的氡气、防火材料 石棉 的颗粒以及空气污染也会增大患肺癌 的风险性。

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This was true even in areas with high levels of both radon gas and gamma radiation.

BBC: Radon cancer fears dismissed

Radon is a gas, a product of decaying radium and an emitter of particles.

FORBES: A Pinch of Poison

Dr Siegfried believes the hormone may exacerbate the effects of exposure to tobacco smoke - and to other substances known to be linked to lung cancer such as the gas radon.

BBC: Lung cancer risk greater for women