Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)
Geophysical measurement of radioactivity of rocks and nuclear fallout in the Broumov area
Abstract
Natural and nuclear fallout radiation has been measured by airborne and ground gamma-ray spectrometry in the area of Broumov, NE Bohemia, Czech Republic, in 2001. The area has been contaminated by the Chernobyl nuclear reactor accident in 1986, as was indicated by spot measurements. 2001 airborne mapping demarcated and 137Cs surface activity anomalous zone of NE-SW direction, amounting to 10-22 kBq . m-2 at the background of 2-5 kBq . m-2 of the area. (Fig. 1). Ground measurements showed local values in the range of up to 36 kBq . m -2. Ratio of 137Cs dose rate to the dose rate of the natural radionuclides in rocks in in range of 7-45 per cent with the maximum in the 137Cs anomalous zone.
