Examples of anthropogenic changes of gamma dose in the environs of the uranium mining area in Sudetes (SW Poland)

Radiometric mapping of the centre of uranium mining and treatment in Poland in the Jedlica valley and its around territory was carried out.. The space changes of doses of the gamma radiation are simultaneously compared with nature background of this region. On the base of analysis of content of the uranium, thorium, and potassium the dose rate generated across of the granite of Karkonos was calculated. In the region of sediments the anomaly high dose rate of the gamma radiation (up to 2600 nGy/h) were obtained. They are in sharp contrast with the regional background 70-90 nGy/h in Jedlica valley, on the background of granite in Karkonos 156 nGy/h, and in Poland 17.7 to 97 nGy/h. The effort to clear up the origin and character of these revealed anomaly was expended. (authors)