Radon daughters exposure and lung cancer in Uranium Mine A of Hunan Province

The results of investigation of radon daughters-induced lung cancer in Uranium Mine A of Hunan Province are reported. The underground concentrations of 222Rn and radon daughters were higher than DAC in the first 2-3 years. From 1971 to 1985, of 2149 miners who started underground work before 1971, 11 died of lung cancer. The mortality of lung cancer was 35.14 x 10-5 and the attributable lung cancer rate was 28.28 x 10-5. The average interval from the start of exposure to death due to lung cancer was 18.5 years. The excess risk rate was 5.58 x 10-6 WLM-1 a-1 and the relative increment frequency was 5.03 x 10-2 WLM-1 a-1. The results of epidemiological study indicated that the incidence of lung cancer was increasing along with the increase in cumulative exposure to radon daughters