Objective To investigate the possible effects of long-term exposure to dust containing thorium and thoron progeny on dust-exposed miners. Methods A negative, high voltage, exhaled thoron progeny measurement system w...Objective To investigate the possible effects of long-term exposure to dust containing thorium and thoron progeny on dust-exposed miners. Methods A negative, high voltage, exhaled thoron progeny measurement system was used to estimate the miners’ thorium lung burden. Results The highest thorium lung burden of 638 miners was 11.11 Bq. The incidence of stage 0+ pneumoconiosis was higher among dust-exposed miners. Lung cancer mortality of the dust-exposed miners was significantly higher than that of controls (P<0.005). Conclusion There is a difference in cancer rates between those who have long-term exposure to dust containing thorium (in which carcinogenic ThO 2 and SiO 2 exist) and thoron progeny and those who have not.展开更多
基金ThisstudywassupportedbytheNationalNaturalScienceFoundationofChina (No 386 0 2 85 )
文摘Objective To investigate the possible effects of long-term exposure to dust containing thorium and thoron progeny on dust-exposed miners. Methods A negative, high voltage, exhaled thoron progeny measurement system was used to estimate the miners’ thorium lung burden. Results The highest thorium lung burden of 638 miners was 11.11 Bq. The incidence of stage 0+ pneumoconiosis was higher among dust-exposed miners. Lung cancer mortality of the dust-exposed miners was significantly higher than that of controls (P<0.005). Conclusion There is a difference in cancer rates between those who have long-term exposure to dust containing thorium (in which carcinogenic ThO 2 and SiO 2 exist) and thoron progeny and those who have not.
