Abstract
Soil gas 222Rn and 220Rn concentrations were measured at 18 locations in the Karkonosze–Izera Block area in southwestern Poland. Measurements were carried out in surface air and at sampling depths of 10, 40 and 80 cm. Surface air 222Rn concentrations ranged from 4 to 2160 Bq m −3 and 220Rn ranged from 4 to 228 Bq m −3. The concentrations for 10 and 40 cm varied from 142 Bq m −3 to 801 kBq m −3 and 102 Bq m −3 to 64 kBq m −3 for 222Rn and 220Rn, respectively. At 80 cm 222Rn concentrations ranged from 94 Bq m −3 to >1 MBq m −3. The 220Rn concentrations at 80 cm varied from 45 Bq m −3 to 48 kBq m −3. The concentration versus depth profiles for 222Rn differed for soils developed on fault zones, uranium deposits or both. Atmospheric air temperature and soil gas 222Rn and 220Rn were negatively correlated. At sampling sites with steep slopes, 220Rn concentrations decreased with depth.
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