Diffusion and defect data, solid state data. Part B, Solid state phenomena/Solid state phenomena · 2015 · 14 citations · 27 references
MedicineBuilding ScienceRadiation DosimetryRadiation ProtectionRadiobiologyAbsorbed DoseEquivalent DoseExposure AssessmentRadiation Dose MeasurementRadiation HealthRadiation Risk AssessmentAlpha SpectroscopyAlpha-particle SpectroscopyDose Conversion FactorIndoor Air SamplingRadonRadon Background MeasurementRadon MeasurementSurface Barrier Detectors
Different measurements of equilibrium equivalent concentration of radon progeny (EEC Rn ) were obtained over a period of one year in indoor air of Physics Department at Minia University, located in the Upper Egypt. A method based on an alpha spectroscopy was used. Sartorius membrane filters (1.2 μm pore size, 25 mm diameter and its efficiency about 100%) were used as a collection media. Alpha activities were measured during and after air sampling by using surface barrier detector. EEC Rn varied between 1.26 and 19 Bq m -3 with an average value of 5.2 ± 0.46 Bq m -3 . Unattached fraction was determined using a single stainless steel-wire-mesh screen (50% penetration for 4 nm equivalent diameter). A mean unattached fraction (f b ) of 0.08 was obtained. Based on the obtained measured data values (f b and EEC Rn ), dose conversion factors were compared to epidemiology based value of 4 mSv/WLM for indoor air.
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