Abstract
An aerosol centrifuge is used for the study of the attachment of thoron decay products to aerosol particles under dynamic flow conditions. The number concentration of aerosols was kept high (10 5–10 6 particles cm −3) as compared to the number of decay product atoms (10 2–10 3 cm −3) as is usually the case in a mine atmosphere. The polydispersed aerosols flow in and out of a chamber containing a steady source of thoron and the aerosols tagged with the decay products were separated into different size groups by an aerosol centrifuge (Lovelace Aerosol Particle Separator). The average activity per particle was fitted as a power function of the radius in the form of A P = αR b . The average value of b was found to be 1.08 ± 0.054 for particles in the radii range 0.25–1.35 μm and 1.34 ± 0.12 for particles in the radii range 0.1–0.33 μm.
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