## 3 Results and Discussion
### Results of Measurements of Radiation and Physical Parameters  
As mentioned earlier, in the first stage, the activity of \({}^{226}\)Ra was measured daily for 21 days. Based on the results of these measurements, the following were determined: the activity of \({}^{226}\)Ra, without taking into account the accumulation of its decay products; the activity of \({}^{226}\)Ra, taking into account the accumulation of the daughter products of its decay; the percentage of radon accumulation (in the \"free\" state); and the period for which the daughter decay products of \({}^{226}\)Ra enter the state of radioactive equilibrium. After the experiment, the counting sample was depressurized, and after 1-2 days, the specific activity of \({}^{226}\)Ra was measured again. To establish the equilibrium of all members of the \({}^{226}\)Ra series in the samples of the studied rocks, a time interval from 5 to 10 days is sufficient (Figure 4). When carrying out further studies with rocks of other types, we consider it possible to reduce the measurement period to 15 days. The emanation coefficient was calculated using two methods: gamma-spectrometric and radiometric (emanation). The coefficient of variation between the results of both methods did not exceed 5-10%. So herein when the emanation coefficient is mentioned it refers to the one calculated only by the gamma spectrometric method. In general, the research results are presented in Table 2, in which the following designations are used: \(\mathrm{Ar_{Ra226}}\)--specific activity of \({}^{226}\)Ra under sealing conditions; \(\mathrm{K_{emanation}}\)--coefficient of emanation; \(\mathrm{AV_{dens}}\)--average density; \(\mathrm{TR_{dens}}\)--true density; Porosity--porosity. Additionally, these designations are used later in the text of the article. In expanded form the results of the study of radiation and physical parameters are shown in Table A1, Appendix A.  
Figure 3: Radon leakage parameter assessment results. We have identified a wide range in the \({}^{222}\)Rn emanation coefficient in the studied rock samples from 3 to 40%. The kimberlites of the vent facies, represented by autolithic breccias, are characterized by low values of the emanation coefficient, in the range from 1 to 8%. In only one case, the value of the emanation coefficient exceeded 10%. Kimberlites were also characterized by a low porosity from 0.46 to 4.91%, which agrees with previously obtained results for pipes of the Arkhangelsk diamondiferous province [32]. At the same time, kimberlite pipes in Yakutia have been characterized by a wider range of porosity variation from 3.6 to 12.9% and in rare cases exceeding 20% [33; 34]. Vent kimberlites are characterized by the lowest activity of \({}^{226}\)Ra among the studied types of rocks, varying from 12.42-15.89 Bq\(\cdot\)kg\({}^{-1}\) (including sealing), with the exception of one sample, in which the specific activity of \({}^{226}\)Ra was much higher 31.46 Bq\(\cdot\)kg\({}^{-1}\) (sample ID 37 CA-13). It is known that among the magmatic formations, kimberlites are characterized minimal content of radioactive elements [35]. In addition, the kimberlites of the pipes of the Zolotitsky field have been characterized by an extremely low average concentration of uranium, 0.67 mg\(\cdot\)kg\({}^{-1}\)[19], which, in terms of the activity of \({}^{226}\)Ra under conditions of radioactive equilibrium in the uranium-238 chain, does not exceed 10 Bq\(\cdot\)kg\({}^{-1}\). Tuffaceous-sedimentary rocks were distinguished by a wider range of radiation and physical parameters. The activity of \({}^{226}\)Ra in these rocks varies from 11.45 to 48.40 Bq\(\cdot\)kg\({}^{-1}\)