Studies of Natural Soil Radioactivity in the Kirchhoff Hill (the Leningrad Region, the Russian Federation)

From the geoecological point of view, a special place in geological section Kirchhoff Hill is occupied by highly radioactive bodies – dictyonema oil shales. As result glacial tectonic dislocations and due to numerous local elevations depressions relief, shales can come into direct contact with soil over relatively large areas here. Based on results route survey gamma field soils zone anomalously high exposure dose rate, we laid pit. Seven samples were taken analyzed from depth 0 85 cm. The first two (0– 25 cm) correspond gray-humus dark-profile type. Here, average value specific effective activity (Aeff) makes 1,750 Bq/kg. Aeff next 5 (25–85 1,870 Such radioactivity values belong environmental hazard class IV impose significant restrictions building construction area studies.