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Radiation Protection Dosimetry 45:115-118 (1992)
© 1992 Oxford University Press

A New Technique to Measure the Activities of Short-Lived Radon Progeny Deposited on Surfaces

J.P. McLaughlin and B. Fitzgerald

A new instrument is described by means of which the activities of short-lived radon progeny deposited on surfaces are measured in real time. A 0.3 m diameter disc of glass, exposed to airborne radon progeny, is rotated slowly beneath a 90m stationary sector of the alpha track detector CR-39. When any part of the glass disc enters the geometric shadow of the CR-39 the radon progeny activities on it are no longer supported by plateout. The spatial distribution of alpha tracks due to the decay of these activities is recorded on the CR-39. At the end of an exposure the CR-39 is etched and the track distribution is mapped using an image analysis system. The surface activities of 218Po, and 214Pb and 214Bi due to plateout on the glass are determined from the track data. By means of a Jacobi-type room model the plateout rates and velocities of the radon progeny may be determined.


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