Abstract
The coagulation constant of nonradioactive and radioactive metallic aerosols produced by an exploding-wire technique was determined experimentally. At early stages of coagulation the coagulation constant of radioactive gold aerosols (2 to 3.5 c./g.) was approximately twenty times the mean value of slightly radioactive aerosols (50 to 900 mc./g.). The values of the coagulation constant were corrected for deposition on vertical wall surfaces by means of a derived equation. Scavenging of radioactive aerosols was divided into three groups based upon the mechanism of coalescence: ( 1) dry particulate matter mixed with an aerosol, ( 2) dry particulate matter formed in the aerosol atmosphere, and ( 3) hygroscopic and liquid particulate matter formed in the aerosol atmosphere. Brownian motion in the presence of a water vapor concentration gradient around condensing droplets was found to be the most effective scavenging mechanism for slightly radioactive aerosols.
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