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Measurements were made of aerosol concentrations and size distribution in 5 locations downstream of working areas in twoCanadian uranium mines which use track and trackless miningmethods. In the track mining area the aerosol concentrationranged from 30000 to 70000/cubic centimeter, averaging 50000 percubic centimeter. The count median diameter of the aerosolaveraged 55 nm.
The organic, inorganic, and radiological characteristics of airborne aerosols have been measured as a function of particle size in controlled atmosphere test chambers and operating uranium mines. Concentrations of benzo(a)pyrene in two mines ranged from 26 to 57 ng/m3 of air. The carbon chain length of adsorbed n-alkanes was correlated with particle size. Normal mining activities produced an ore dust aerosol with mass median aerodynamic diameter (MMAD) greater than 2 .mu.m. The elements Na, Al, Si, K, Ca, Ti, V, Fe, and U exhibited elemental ratios similar to bulk ore and had comparable MMAD's. The S, Zn, and Pb were higher in aerosols than bulk ore and were associated with smaller MMAD particulates. Radon daughter particle size distributions were influenced by the kinds of particulates generated in mining activity.