氡是广泛存在的天然辐射源。有关氡及其子体对人的危害是近几十年才逐渐被认识并广泛深入地开展研究的。从流行病学调查表明,吸入氡及其子体造成的辐射危害,不但大大地增加了铀矿工肺癌发生率,而且也是居民肺癌发生的有关原因之一,尤其当前一些国家为了节能,采用房屋密闭并减少了通风率,致使室 Radon is a widespread natural radiation source. The harm to human beings from radon and its daughters has only been gradually recognized and extensively studied in recent decades. Epidemiological studies have shown that inhalation of radon and its daughters caused by radiation hazards, not only greatly increased the incidence of lung cancer uranium miners, but also one of the causes of lung cancer among residents, especially in some countries in order to save energy, the use of airtight housing And reduce the ventilation rate, resulting in room