International Journal of Academic Management Science Research (IJAMSR)   Year: 2020 | Volume: 4 | Issue: 9 | Page No.: 118-123 Migration Characteristics of Natural and Technogenic Radionuclides in Soils of Samarkand Region Eshburiev R.M., Umirzakov E.A., Khasanov Sh. Kh., Sayfinov R., Kakhorova A.N., Khoshimov K., Umarov E., Yunusova U.X. Abstract: In this study, the specific activity of natural radionuclides 226Ra, 232Th, 40K , and technogenic radionuclides 137Cs in soil layers using the gamma spectrometry method was studied. The results showed that natural radionuclides 226Ra and 232Th and technogenic radionuclides 137Cs mainly have a high specific activity on the surface of 1-2 cm of soil. The lower layer of 15-20 cm activity was 20-30% lower than that of these radionuclides, and radionuclides undergo horizontal migration. It was found that the specific activity of the 40K isotope reaches a maximum value of 10-15 cm in the soil layer, and this radionuclide is mainly redistributed in the soil as a result of vertical migration.