## 3 Results and Discussion
### Results of Measurements of Radiation and Physical Parameters
\begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline  & \multicolumn{6}{c}{**Radiation and Physical Characteristics**} \\ \cline{2-11}  & \multicolumn{2}{c}{**A\({}_{\text{R225}}\)**} & \multicolumn{2}{c}{**K\({}_{\text{emanation}}\)**} & \multicolumn{2}{c}{**AV\({}_{\text{dens}}\)**} & \multicolumn{2}{c}{**TR\({}_{\text{dens}}\)**} & \multicolumn{2}{c}{**Porosity**} \\ \hline  & **Range** & **Mean** & **Range** & **Mean** & **Range** & **Mean** & **Range** & **Mean** & **Range** & **Mean** \\ \hline Overlapping Rocks & 15.88–30.21 & 22.19 & 11.09–24.91 & 17.41 & 1.83–2.03 & 1.93 & 2.38–2.94 & 2.54 & 18.47–32.65 & 23.77 \\ \hline Kimberlites & 12.42–31.46 & 17.59 & 1.76–10.67 & 7.14 & 1.74–2.35 & 2.06 & 1.83–2.37 & 2.11 & 0.46–4.92 & 2.39 \\ \hline Host Rocks & 16.05–63.32 & 35.52 & 6.19–29.13 & 13.94 & 1.47–2.19 & 1.89 & 2.06–2.7 & 2.42 & 4.72–40.96 & 21.11 \\ \hline Tuffaceous Sedimentary Rocks & 11.45–48.4 & 28.81 & 9.82–34.13 & 22.34 & 1.36–1.90 & 1.73 & 2.12–2.54 & 2.28 & 13.21–36.74 & 24.04 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Results of measurements of radiation and physical characteristics of samples. Figure 4: The nature of the distribution of the activity of \({}^{226}\)Ra in time after sealing. the emanation coefficient from 9.82 to 34.13% and porosity from 13.20 to 36.74%. However, a different picture was observed in the distribution of the studied parameters in the host Vendian and overlying Quaternary and Carboniferous rocks. Most of these rocks were characterized by significant porosity (up to 41%) which are in good agreement with the data given in [32] concerning the study of the host rocks of the Arkhangelsk diamondiferous province (from 8 to 40%). The host rocks are distinguished by a high level of specific activity of \({}^{226}\)Ra--up to 63.32 Bq\(\cdot\)kg\({}^{-1}\) and the overlying rocks have a high level of the emanation coefficient (up to 28%) (Figure 5). The rate of radon production was calculated for the different types of rocks (Table 3). This parameter is one of the most important for assessing radon in its free state. Figure 5: Histogram of radium activity (**a**), emanation coefficient (**b**) and porosity (**c**) for the studied types of rocks. \begin{table}
\begin{tabular}{c c c} \hline \hline  & **Radon Production Rate, Bq\(\cdot\)m\({}^{-3}\cdot\)h\({}^{-1}\)** & \\ \hline \hline  & **Range** & **Mean** \\ \hline Overlapping Rocks & 38.88–59.12 & 52.47 \\ \hline Kimberlites & 9.84–18.96 & 16.15 \\ \hline Host rocks & 37.19–132.03 & 63.88 \\ \hline Tuffaceous Sedimentary Rocks & 33.97–139.57 & 75.39 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Radon production rate for the studied types of rocks. The minimum level of radon production, from 9.84 to 18.96 Bq\(\cdot\)m\({}^{-3}\cdot\)h\({}^{-1}\) (Table 3) is characteristic of kimberlites of the vent facies. Considering the high values of the specific activity of radium, the emanation coefficient, the level of radon production and porosity, the enclosing rocks of the near-pipe space stand out among the other types. In the Vendian host rocks a number of mineralogical, structural and geochemical features were found. Postmagmatic endogenous bleaching associated with the influence of kimberlites was found in the host red rocks of the Vendian [21; 36; 37; 38; 39; 40; 41]. The zones of bleaching occurred at the contact with magmatic bodies and in tectonic faults were formed as a result of the action of reducing fluids [42]. These rocks with vein bleaching clarification are characterized by an increased content of uranium, thorium and potassium, and they are also characterized by geochemical anomalies, specific mineralogical associations and stable isotope anomalies [21; 22; 40]. These rocks with vein endogenous bleaching are characterized by high content of K, Fe, Rb, Zn, Sr, Ni and depleted (light) isotopic composition of calcite carbon (\(8^{13}\)C\(-4.9\) and \(-5.5\)%).