Abstract
Ventilation rate values are calculated from track density measurements in solid state nuclear track detectors (SSNTD), both when ventilation is the main cause of radioactive disequilibrium in radon progeny, and when it shares importance with other agents. The method consists of exposing a SSNTD of high intrinsic efficiency (CR-39) in filtered and unfiltered conditions and, in addition, covered with a thin aluminum foil, to stop alpha particles from 218Po and 222Rn. No calibrations are required, but, when necessary, independent measurements of the loss rates of radioactivity to aerosol and to the walls have to be performed. Ventilation rates depend upon geometric detection efficiencies for alpha particles, obtained here by Monte Carlo simulation, taking into account the space distribution of emission positions. This may lead to sizeable corrections in ventilation and equilibrium factor values. Since geometric detection efficiencies depend upon alpha particle ranges in air, the influences of barometric variables are also discussed.
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