The status quo of radon concentrations and mitigation measures in underground working places of China

【Abstract】 By using solid-state nuclear detectors, the air radon concentrations at 87 underground working places were measured during spring, summer and winter, respectively. The survey covered 23 cities whose annual radon concentrations range from {14.9} to {246.4} Bq·m{-3} with an overall arithmetic mean value of {106.7} Bq·m{-3}. The average annual effective dose received by people working in these underground working places was {1.6} mSv, hence the lifetime fatality risk was {1.2}×10{-4}. Fujian Province had the highest radon level during the survey. It is better to reduce the radon concentration heavily in summer because of higher radon concentration than in winter.更多还原