Natural Radioactivity level and the measurement of soil gas Radon ,Thoron concentrations in Hilla city

Examine the level of natural radioactivity of radon concentration and thoron in the soil for ten important sites in the city of Hilla, by spectrometer gamma Na (Tl) system, and a focus for radon and thoron in the soil was defined using the detector solid state (RAD7), this study aims to identify the difference in the concentration of radon and thoron as well as assess the health risks associated with radioactivity natural, if any, and by the results found that the concentration of radon gas soil in the study area ranged between 34-15200 Bq/m3, it was observed that the highest concentration of radon is in the depth and the lowest concentration measured in surface.The average concentration activity of uranium, thorium, and potassium found 14.079 ± 0.46, 12.326 ± 0.43 and 416.655 ± 2.86 Bq/m3 respectively. Thus, the annual affecting radionuclide dose identified and analyzed, and found the calculated dose values is not too high and not exceeding the proposed radio-protection standards by international agencies