title: Room model based Monte Carlo simulation study of the relationship between the airborne dose rate and the surface-deposited radon progeny.
abstract: The quantitative relationships between radon gas concentration, the surface-deposited activities of various radon progeny, the airborne radon progeny dose rate, and various residential environmental factors were investigated through a Monte Carlo simulation study based on the extended Jacobi room model. Airborne dose rates were calculated from the unattached and attached potential alpha-energy concentrations (PAECs) using two dosimetric models. Surface-deposited (218)Po and (214)Po were significantly correlated with radon concentration, PAECs, and airborne dose rate (p-values <0.0001) in both non-smoking and smoking environments. However, in non-smoking environments, the deposited radon progeny were not highly correlated to the attached PAEC. In multiple linear regression analysis, natural logarithm transformation was performed for airborne dose rate as a dependent variable, as well as for radon and deposited (218)Po and (214)Po as predictors. In non-smoking environments, after adjusting for the effect of radon, deposited (214)Po was a significant positive predictor for one dose model (RR 1.46, 95% CI 1.27-1.67), while deposited (218)Po was a negative predictor for the other dose model (RR 0.90, 95% CI 0.83-0.98). In smoking environments, after adjusting for radon and room size, deposited (218)Po was a significant positive predictor for one dose model (RR 1.10, 95% CI 1.02-1.19), while a significant negative predictor for the other model (RR 0.90, 95% CI 0.85-0.95). After adjusting for radon and deposited (218)Po, significant increases of 1.14 (95% CI 1.03-1.27) and 1.13 (95% CI 1.05-1.22) in the mean dose rates were found for large room sizes relative to small room sizes in the different dose models.
authors: Department of Occupational and Environmental Health, Department of Biostatistics, College of Public Health, University of Iowa, Iowa City, IA 52242, USA.
authors: Kainan
authors: K
authors: Sun
authors: R William
authors: RW
authors: Field
authors: Daniel J
authors: DJ
authors: Steck
mesh_terms: D000396:Air Pollutants, Radioactive / Q000009:adverse effects / Q000032:analysis*; D016902:Air Pollution, Indoor / Q000009:adverse effects / Q000032:analysis*; D006798:Housing; D006801:Humans; D007484:Iowa; D008175:Lung Neoplasms / Q000453:epidemiology / Q000209:etiology; D008962:Models, Theoretical; D009010:Monte Carlo Method; D009381:Neoplasms, Radiation-Induced / Q000453:epidemiology / Q000209:etiology; D011059:Polonium / Q000009:adverse effects / Q000032:analysis; D011829:Radiation Dosage; D011874:Radiometry / Q000706:statistics & numerical data; D017687:Radon Daughters / Q000009:adverse effects / Q000032:analysis*; D012044:Regression Analysis; D013499:Surface Properties; D014691:Ventilation
chemical_list: D000396:Air Pollutants, Radioactive; D017687:Radon Daughters; D011059:Polonium