自然界中的放射性惰性气体氡无色、无味、无嗅,但是大剂量高浓度的氡却是致命的。高剂量的辐射主要存在于由花岗岩组成的底土中。同样,它也存在于建筑材料中。长久以来,人们已经了解高浓度的氡可以导致肺癌。然而,科学家现在认为低浓度的氡也有致病的危险,并增加了氡辐射效应的等级划分。氡 Radioactive noble gases in nature are radonless, odorless and odorless, but large doses of high concentrations of radon are fatal. High doses of radiation are mainly found in the subsoil of granite. Likewise, it also exists in building materials. It has long been known that high levels of radon can cause lung cancer. However, scientists now believe that low concentrations of radon are also at risk for disease and increase the hierarchy of radon effects. radon