title: Impact of haze-fog days to radon progeny equilibrium factor and discussion of related factors.
abstract: The equilibrium factor F between radon and its short-lived progenies is an important parameter to estimate radon exposure of humans. Therefore, indoor and outdoor concentrations of radon and its short-lived radon progeny were measured in Beijing area using a continuously measuring device, in an effort to obtain information on the F value. The results showed that the mean values of F were 0.58 ± 0.13 (0.25-0.95, n = 305) and 0.52 ± 0.12 (0.31-0.91, n = 64) for indoor and outdoor, respectively. The indoor F value during haze-fog days was higher than the typical value of 0.4 recommended by the United Nations Scientific Committee on the Effects of Atomic Radiation, and it was also higher than the values of 0.47 and 0.49 reported in the literature. A positive correlation was observed between indoor F values and PM2.5 concentrations (R (2) = 0.71). Since 2013, owing to frequent heavy haze-fog events in Beijing and surrounding areas, the number of the days with severe pollution remains at a high level. Future studies on the impact of the ambient fine particulate matter on indoor radon progeny equilibrium factor F could be important.
authors.affiliation: National Institute for Radiological Protection (NIRP), Chinese Center for Disease Control and Prevention, Beijing, 100088, China.
authors.forename: Changsong
authors.initials: C
authors.lastname: Hou
authors.affiliation: National Institute for Radiological Protection (NIRP), Chinese Center for Disease Control and Prevention, Beijing, 100088, China. shangbing66@163.com.
authors.forename: Bing
authors.initials: B
authors.lastname: Shang
authors.affiliation: National Institute for Radiological Protection (NIRP), Chinese Center for Disease Control and Prevention, Beijing, 100088, China.
authors.forename: Qingzhao
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: National Institute for Radiological Protection (NIRP), Chinese Center for Disease Control and Prevention, Beijing, 100088, China.
authors.forename: Hongxing
authors.initials: H
authors.lastname: Cui
authors.affiliation: National Institute for Radiological Protection (NIRP), Chinese Center for Disease Control and Prevention, Beijing, 100088, China.
authors.forename: Yunyun
authors.initials: Y
authors.lastname: Wu
authors.affiliation: National Institute for Radiological Protection (NIRP), Chinese Center for Disease Control and Prevention, Beijing, 100088, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Deng
mesh_terms: D000396:Air Pollutants, Radioactive / Q000032:analysis*; D016902:Air Pollution, Indoor / Q000032:analysis*; D002681:China; D052638:Particulate Matter / Q000032:analysis*; D011834:Radiation Monitoring / Q000379:methods*; D017687:Radon Daughters / Q000032:analysis* / Q000737:chemistry; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014887:Weather
chemical_list: D000396:Air Pollutants, Radioactive; D052638:Particulate Matter; D017687:Radon Daughters
keywords: Equilibrium factor; Haze-fog; PM2.5; Radon progeny