Determination of radiological map of radionuclides distribution in soils ‎around of Shazand oil power plant

In this study, 34 soil samples were collected from the east of the Shazand power plant to the  Arak city, with a length of 25 km. The specific activities of radionuclides of 226Ra, 232Th, 40K, and 137Cs were determined using gamma-ray spectrometry method. Gamma-ray spectra registered to employ high purity germanium (HPGe) detector with 30% relative efficiency. Specific activities of corresponding radionuclides in the soil samples varied from 18.92±3.82 to 43.11±5.38, from 25.31±4.23 to 54.27±7.30, from 230.17±19.93 to 728.25±36.06 and from <1.49 to 35.77±1.76 in Bq/kg, respectively. Alpha and gamma indices were calculated. Gamma index with average value as 0.86 in samples varied from 0.61 to 1.16.  Alpha index obtained in a range of 0.09 to 0.22 with average as 0.13. Radiological map of radionuclides distributions using SURFUR15 software was derived.