Simultaneous measurements of unattached fraction and activity median diameter of progenies in different indoor air conditions

A simple method for simultaneous measurements of radon progeny unattached fraction (fp) and radioactive aerosol activity median diameter (AMD) has been proposed which based on the wire screen penetration theory and using two wire screens and a filter. The experimental apparatus include a sampling unit and a measurement system. The sampling unit consists of sampling head, flow rate meter, activity charcoal canister and pump. Sampling head consists of two wire screens of different mesh number and a filter. In order to obtain the potential alpha energy concentration (PAEC) of radon progeny, alpha activity in wire screens and filter has been measured by using a low background alpha counter with multi-detectors. The charcoal canister has been measured by using a gamma-ray spectrometer, thereby radon concentration can determined. This method has been applied to measurements of fp and AMD for different air conditions in a generic laboratory. Annual effective dose (AED) in Tracheobronchial (T-B) region and dose conversion factors (DC F) (including conversion dosimetry of in mSv·WLM-1 and conversion conventions of in μSv/(a·Bq·m-3) have been calculated using measured fp and AMD values