The natural radionuclide (238U, 226Ra, 232Th and 40K) contents in soil were determined for three different regions of Bulgaria using high-resolution gamma-ray spectrometric analysis. A comparison of the dynamics of their behavior throughout the years was performed. Bulgaria is a country with intensive uranium mining activities. That is why radiological monitoring of closed uranium mining facilities in different regions of the country are obligatory and of great interest. This work presents results from such investigations made in regions where remediation was necessary. The results have been evaluated according to Bulgarian radionuclide environment contamination legislation.
Financed by the National Centre for Research and Development under grant No. SP/I/1/77065/10 by the strategic scientific research and experimental development program:
SYNAT - “Interdisciplinary System for Interactive Scientific and Scientific-Technical Information”.