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氡 从有放射性物质的石头和矿产中自然释放的放射性气体。产生于非碳的矿，例如锡矿、铁矿、氟石和铀矿。氡衰变产生阿尔法粒子辐射，并被认为是氟石矿的矿工多发肺癌的根源。在临近花岗岩或旧锡矿的地区，氡的浓度应被关注。 dōng
environ.	radoon