Zheltonozhskaya M. Research of the radionuclides vertical migration in the ChNPP area using of unradiochemistry methods.

Thesis is devoted to the radioecological researches which include: development of new practical approaches to definition of transuranic radionuclides in soils; an estimation of the radionuclides content in soils using developed technique; an estimation of parameters of 90Sr, 137Cs, 154,155Eu, 241Am and isotopes Pu vertical migration in various soil types; an estimation of isotope ratio of investigated ra-dionuclides in soils. The unradiochemistry technique was developed for measure-ments of alpha-radiating nuclides from ChNPP 30-km zone. A new calibrating source 44Ti in ultralow area of energy of gamma-quantums (4 keV) was received for successful realization of the developed technique. The investigations of radionuclides migra-tion at the territories located inside ChNPP 30-km zone and the complex compara-tive analysis of behaviour of Pu, 241Am, 154,155Eu, 90Sr, 137Cs isotopes in soil of these territories were carried out. Parameters of vertical migration of radionuclides in soils were estimated. Data about the ecological periods of semidepuration of soil different types were obtained.