Abstract
Abstract Using cellulose and charcoal filters simultaneously, we propose a very simple method to estimate the attached and unattached fractions of some airborne radionuclides. We have systematically controlled by gamma-ray spectrom-etry the concentrations in surface air of some primordial radionuclides: 40K, 226Ra, 212Pb, 214Pb, 208Tl and 214Bi. We have also determined the concentration of the cosmogenic radionuclide 7Be. All the activities of these elements keep lower than the accepted mean values, and in most cases are around the background activity. The results show that 214Bi, 212Pb, 214Pb and 208Tl are always attached to aerosols, whereas 7Be, 40K and 226Ra have also a fraction unattached. Using a scanning electronic microscope we have determined the main components of the aerosols, which are found to be Si, Ca, Al, Cl and K.
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