## 3 Results  
### Radiation Research  
Concentration values of natural and anthropogenic radionuclides in the soil for each site are presented in Table 2. In the case of cesium \({}^{137}\)Cs, its deposition was also determined. Moreover, average values and standard deviations have been calculated (Figure 2). Graphic interpretation of concentration of radionuclides in the soil is presented in Figure 1. The colors indicate, respectively: blue--radium \({}^{226}\)Ra, green--actinium \({}^{228}\)Ac, red--potassium \({}^{40}\)K, purple--cesium \({}^{137}\)Cs. Concentrations of radionuclides in the soil vary. The lowest mean value was obtained for actinium \({}^{228}\)Ac and the highest for potassium \({}^{40}\)K. The anthropogenic radionuclides concentration is higher than radium \({}^{226}\)Ra or actinium \({}^{228}\)Ac and lower than potassium \({}^{40}\)K concentrations. The values of particular radionuclide at each site differ. The highest variation is observed for the anthropogenic radionuclide. The coefficient of variation equals 69%. It means that values of anthropogenic radionuclides concentration in the soil are largely spread. The similar dependence is seen in the case of deposition of cesium \({}^{137}\)Cs. The coefficient of variation is 65%. The variations of natural radionuclides are not that large but are significant. The coefficient of variation ranges from 28 to 33%. A large region characterized by low values of natural radionuclides concentration is clearly visible (Figure 2). The place is located along the road no. 82. Moreover, there are some sites such as Ciek Zienkowski and Piwonica where the values are minor. One site shows where concentrations of the natural radionuclides are: very significant--Blizionki, and high--Zereminska. In detail, there are two regions characterized by a low concentration of the radionuclide (the area of Karczunek and Laka Pokrzywnik, the area of Blizionki and Piwonica). In two sites, a low concentration of the anthropogenic radionuclide was observed (Wielki Lan, Wolka Wytycka). The only regions of high concentration, are the areas of Zereminska, Urszulin Prehod and Ciek Zienkowski. In two sites, the concentration is high--Ostoja Poleska and Puszczyk Mszarny. In general, regarding anthropogenic  
\begin{table}
\begin{tabular}{l c c c c c} \hline \hline \multirow{2}{*}{**Site**} & \multicolumn{2}{c}{**Concentration in Bqkg\({}^{-1}\)**} & \multicolumn{3}{c}{**Deposition in kBqm\({}^{-2}\)**} \\ \cline{2-6}  & \({}^{226}\)Ra & \({}^{228}\)Ac & \({}^{40}\)K & \({}^{137}\)Cs & \({}^{137}\)Cs \\ \hline
1 & 6.6  
radionuclide, the southern regions are characterized by a lower concentration than the northern regions. The results of the research were used to estimate the absorbed dose for humans from each sampling site (Figures 3 and 4). The average value for the Poleski National Park is 47 nGyh\({}^{-1}\). The minimal and maximal values are, respectively 40 nGyh\({}^{-1}\) (Las Tafle) and 58 nGyh\({}^{-1}\) (Blizionki). The values for the Park were lower than the average worldwide value, which is 59 nGyh\({}^{-1}\) (SRS 19, 2001). Figure 2 shows the data for the absorbed dose values for each site and the red line shows the average worldwide value. The results of the research were also used to estimate the annual effective dose for all sites (Figure 4). The average value of annual effective dose for the Poleski National Park is 0.12 mSvy\({}^{-1}\). The minimal and maximal values are 0.06 mSvy\({}^{-1}\) (Las Tafle) and 0.22 mSvy\({}^{-1}\) (Blizionki), respectively. The values for the Park are mainly higher than the average worldwide value of 0.07 mSvy\({}^{-1}\). Additionally, the annual effective dose to which a person in the park is exposed in accordance with the principle of pessimism adopted in radiological protection was calculated. The annual effective dose was estimated at 0.22 mSvy\({}^{-1}\). It is over three times higher than the world average value.