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一、氡和氡子体的性质氡是一种无色、无味、透明的放射性气体。其半衰期为3.825天。在温度为-61.8℃时由气体转为液体,在-113℃时,呈固体。在标准状况下,纯氡的比重为9.37克/升,是一种最重的气体,一居里的氡体积为0.66立方毫米,重量为6.5微克,国家规定矿井空气中氡的浓度不得超过1×10~(-10)居里/升(1艾曼),所以尽管纯氡比空气重得很多,但因氡在空气中的浓度很低,所以就纯氡的比重而言对氡在井
First, the nature of radon and radon progeny Radon is a colorless, odorless, transparent radioactive gases. Its half-life is 3.825 days. At a temperature of -61.8 ℃ from gas to liquid at -113 ℃, was solid. Under standard conditions, pure radon has a specific gravity of 9.37 g / l, which is one of the heaviest gases, with a volume of 0.66 cubic millimeters per cubic centimeter and a weight of 6.5 micrograms. The concentration of radon in the mine air must not exceed 1 Therefore, although pure radon is much heavier than air, radon is very low in air due to the low concentration of radon in the air