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环境中存在着三个主要的天然放射性衰变系列,它们都是放射气体,吸入后对人体造成一定危害。空气中的氡大都来自土壤的镭,海洋也贡献了相当的部分,此外植物、地下水、天然气、燃煤、建筑材料等都向大地释放一定量的氡。 由于高浓度氡长期对人类照射导致受照人群肺癌发病率增加已被国际学术界公认。WHO(世界卫生组织)国际研究中心以动物实验证实氡是19种致癌物质之一。所以它在人群周围的存量与人体建康有密切关系。吸入过量的氡及其子体使肺癌发病率增加,这已为许多研究证实。随着人们对氡子体可诱
There are three major series of natural radioactive decays in the environment. They are all radioactive gases that cause some harm to the human body after inhalation. The vast majority of radon in the air comes from radium in the soil, and the ocean contributes a considerable amount of it. In addition, plants, groundwater, natural gas, coal-fired, building materials, etc. all release a certain amount of earthworms to the earth. The increase in the incidence of lung cancer in exposed populations due to long-term exposure of humans to high concentrations of strontium has been recognized by the international academic community. The WHO (World Health Organization) International Research Center has confirmed with animal experiments that carp is one of 19 carcinogens. Therefore, its stock around the crowd has a close relationship with Jiankang. The inhalation of excess sputum and its daughters increases the incidence of lung cancer, which has been confirmed by many studies. As people can induce lice