title: Thoron progeny size distribution in monazite storage facility.
abstract: Field experiments in the atmosphere of monazite warehouses with a high content of (220)Rn progeny concentration were conducted. Size distribution of aerosol particles was measured with the combined use of diffusion battery with varied capture elements and cascade impactor. Four (212)Pb aerosol modes were detected-three in the ultrafine region (aerosol median thermodynamic diameters ∼0.3, 1 and 5 nm) and one with an aerosol median aerodynamic diameter of 500 nm. The activity fraction of aerosol particles with the size <10 nm is nearly 20-25 %. The dose conversion factor for EEC₂₂₀Rn exposure, obtained on the basis of the aerosol size distribution and existing research data on lung absorption types of (212)Pb aerosols, is close to 180 nSv per Bq h m(-3).
authors.affiliation: Institute of Industrial Ecology, Ural Branch Russian Academy of Sciences, S. Kovalevskoy St. 20, Eekaterinburg 620990, Russia.
authors.forename: Marina
authors.initials: M
authors.lastname: Rogozina
authors.affiliation: Institute of Industrial Ecology, Ural Branch Russian Academy of Sciences, S. Kovalevskoy St. 20, Eekaterinburg 620990, Russia michael@ecko.uran.ru.
authors.forename: Michael
authors.initials: M
authors.lastname: Zhukovsky
authors.affiliation: Institute of Industrial Ecology, Ural Branch Russian Academy of Sciences, S. Kovalevskoy St. 20, Eekaterinburg 620990, Russia.
authors.forename: Aleksey
authors.initials: A
authors.lastname: Ekidin
authors.affiliation: Institute of Industrial Ecology, Ural Branch Russian Academy of Sciences, S. Kovalevskoy St. 20, Eekaterinburg 620990, Russia.
authors.forename: Maksim
authors.initials: M
authors.lastname: Vasyanovich
mesh_terms: D000336:Aerosols / Q000032:analysis*; D000396:Air Pollutants, Radioactive / Q000032:analysis*; D016902:Air Pollution, Indoor / Q000032:analysis*; D006801:Humans; D008674:Metals, Rare Earth / Q000737:chemistry* / Q000528:radiation effects*; D011834:Radiation Monitoring; D011886:Radon / Q000032:analysis*
chemical_list: D000336:Aerosols; D000396:Air Pollutants, Radioactive; D008674:Metals, Rare Earth; C015370:monazite; D011886:Radon