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Radon activity in the atmosphere and its behavior in the environment have been investigated using LR-115 nuclear&#13; track detector. The complex geological structure of Wzgórza Niemczansko-Strzelinskie (south-west&#13; Poland) enabled this problem to be studied in various geological conditions. The eU and eTh content in rocks&#13; and soil was measured by gamma-spectrometer GR-320. Uranium content of bedrock reached its maximum&#13; value of 15 ppm in the case of quartz-graphite schist. Thorium reached its maximum value of 35 ppm in the&#13; case of granodiorite. Radon activity was measured by means of long-term exposure of LR-115. The mean value&#13; of atmospheric radon activity was 21 Bqm-3 in the air 2 m above the ground surface. The highest radon activities&#13; were measured in the area of granite and quartz-graphite schist outcrops and in the area of mylonitic&#13; rocks of the Niemcza Zone. Radon activity in close to ground cup detectors varies from 25 to 300 Bqm-3, these&#13; values depend on uranium and thorium content in indirect ground basement (soil and weathered rocks). Not&#13; only uranium and thorium content but also rock disintegration due to tectonic events (shear zones) influenced&#13; atmospheric radon activity. Seasonal variation is not strong, although higher values were measured in the autumn-&#13; winter period

annals of geophysics

Distribution of radon activity in the atmosphere above Wzgórza Niemczansko-Strzelinskie (South-WestPoland) and its dependence on uranium and thorium content in the underlying rock and indirect ground basement