Atoms of the radon daughters immediately after the radioactive decay of radon atoms have tendency to attach to condensation nuclei producing radioactive aerosols. Aerosols of size below 10 nm, composed of unattached ions or neutral atoms and molecular clusters associated with radon progeny atoms, are traditionally called unattached fraction. Aerosols above 10 nm up to greater than 1000 nm, with...

Recently, a method for long-term Rn measurements was proposed that combines the radon absorption ability of some polycarbonates, like Makrofol, with their track-etch properties. The method is independent of any particular Rn progeny behavior and the very first evaluation of this approach showed that its range of sensitivity covers practically the entire range of indoor Rn-concentrations. This m...

Indoor radon concentrations were measured in four well-known spas of Tunisia using nuclear track detectors. The radon concentrations in these spas were found to be in the range of 19 − 870 Bq.m-3. The equilibrium factor F between radon and its progeny was found to vary in the range of 0.2 0.5, depending upon the ventilation rates within the buildings of the spas. Using the exposure-dose convers...

This study aimed to investigate the differences in relationship between radon and its progeny concentrations particulate matter under varying pollution weather conditions. Outdoor were measured by a radon/thoron- radon/thoron monitor (ERS-RDM-2S) during haze dust storm Beijing. Particulate meteorological data simultaneously recorded. Results showed that exhibited diurnal variation pattern, with...

To calculate the absorbed dose in the human lung due to inhaled radon progeny, ICRP focussed on the layers containing the target cells, i.e., the basal and secretory cells. Such an approach did not consider details of the sensitive cells in the layers. The present work uses the microdosimetric approach and determines the absorbed alpha-particle energy in non-spherical nuclei of target cells (ba...

In this paper, we propose a method to determine the equilibrium factor using a bare LR 115 detector. The partial sensitivities rhoi of the LR 115 detector to 222Rn and its alpha-emitting short-lived progeny, 218Po and 214Po, were investigated. We first determined the distributions of lengths of major and minor axes of the perforated alpha tracks in the LR 115 detector produced by 222Rn, 218Po a...