天然辐射是人类所受辐射的主要来源 ,氡则是天然辐射中的最主要辐射。氡是由铀 (镭 )等核素衰变产生的自然界唯一的放射性气体 ,无色 ,无味。氡在空气中的衰变产物被称为氡子气。常温下氡及其氡子气被吸入人体后 ,会对人体进行内辐射。氡是继吸烟后引起肺癌的第二大因素 ,已引 Natural radiation is the main source of human radiation, radon is the most important natural radiation radiation. Radon is the only natural radioactive gas produced by the decay of radionuclides such as uranium (radium), colorless and tasteless. Radon in the air decay product is called radon gas. Radon and its radon gas at room temperature is inhaled into the human body, the body will be within the radiation. Radon is the second most common cause of lung cancer after smoking