Abstract
Objective To explore the general characteristics of the concentration and size distribution of aerosols in a mine. Methods In different areas of a non-uranium mine, the particle number and mass concentration of aerosols were surveyed with a condensation particle counter and a personal aerosol monitor, respectively, and the size distribution of aerosols larger than 1 μm in size was estimated according to the size-selective measurements of mass concentrations. The size distribution of submicron aerosols was evaluated based on the method of screen diffusion battery (SOB), and the measurements were performed in both inside and outside of a control room. Results The mass concentration of inhaled particles (PM10) was averaged to be 0.42 mg/m3 in the whole mine, and it varied with different working areas and significantly affected with human activities, In the mine, particles lager than 1 μm in size widely distributed, while the particles less than 5 nm in size were seldom observed. Conclusions The characteristics of aerosol significantly change with different working areas, human activities and ventilation condition in mine. The dose contribution from inhaled radioactive particles lager than 1 μm in size should be considered in mine. Key words: Aerosol; Mass concentration; Particle number; Size distribution
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