Abstract
The natural radioactivity of 40 K , 208 Ti , 212 Pb , 212 Bi , 214 Pb , 214 Bi , 228 Ac and the fallout of 137 Cs in typical rocks and soils of Świeradów Zdrój area (Sudetes Mountains, Poland) were measured in situ using a portable gamma-ray spectrometry workstation. The measurement points were chosen for different regional lithology: within hornfelses of the Szklarska Por e ̨ ba schist-belt, quartz rocks, gneisses of the Świeradów Zdrój unit, leucogranites, leptinites, mica schists of the Stara Kamienica belt, and finally the zones of the southern and northern contacts of the Stara Kamienica schist-belt with leucogranites and gneisses of the Lesna unit, respectively. 40 K activity varied in the range from about 320 Bq kg −1 (quartz) to 1200 Bq kg −1 (gneisses). The activity concentrations associated with 228 Ac ( 232 Th series) varied in the range from 25 Bq kg −1 (quartz) to 62 Bq kg −1 (leucogranites), whereas activity concentration of 226 Ra varied in the range from about 31 Bq kg −1 (hornfelses) to 122 Bq kg −1 (leucogranites). Relatively low deposits of 137 Cs were noted in the investigated area, where the activity concentrations ranged from 4001 (hornfelses) Bq m −2 to less than 154 Bq m −2 (leucogranites).
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