Detection of radon and radon daughters by means of an electret ionization chamber combined with solid state nuclear track detectors

For measuring radon concentrations in air an electret ionization chamber of the diffusion type was developed. The change of the charge density on the electret surface is a measure of the radon concentration from which the concentration of radon daughters can be estimated assuming an equilibrium factor. This factor, however, varies strongly dependent on environmental and other conditions. In order to determine the equilibrium factor more precisely, a combination of three solid-state nuclear track detectors was studied which allows the selective detection of alpha particles in defined energy intervals. (author)