Radon is found to be the second most common reason for lung cancer (after smoking). Since radon can easily be trapped inside buildings, indoor radon concentrations can increase to many times that of outdoor levels. When radon gas decays, it emits radioactive radiation in the form of an alpha particle/waves.
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The staffs working in the Namtaeryeong and the Gyeongbokgung station received relatively high radon exposure compared to the others. The reason is assumed that the stations are located on the granite, and particularly the Namtaeryeong station is deeper than the other stations.