[en] As a result of the Kyshtym accident in 1957, about 2 million Ci of radioactive material was ejected into the atmosphere in the zone of an atomic-industry enterprise in the Southern Urals, and was subsequently dispersed and settled on the territory of Chelyabinsk, Sverdlovsk, and Tyumen Oblasts. With time, ⁹⁰Sr was left as the main contaminant, accounting for as much as 100% of the total content of radionuclides in the mixture of fission fragments already 8-10 years after the emission. The authors studied the level of contents of ⁹⁰Sr and ^134,137Cs in soils and woody plants within the bounds of the radioactive trace of the accident in 1957 in the Southern Urals. This article gives a quantitative evaluation of the contribution of various sources of the radionuclides' entry to contamination of the inspected territory's soils. 5 refs., 1 fig., 3 tabs