[en] In the world the most widespread method of soil decontamination consists of removing the contaminated upper layer and sending it for long-term controlled storage. However, implementation of this soil cleanup method for remediation of large contaminated areas would involve high material and financial expenditures, because it produces large amounts of radioactive waste demanding removal to special storage sites. Contaminated soil extraction and cleanup performed right on the spot of remediation activities represents a more advanced and economically acceptable method. Radiological separation of the radioactive soil allows reducing of amount of radwaste. Studies performed during the liquidation of the Chernobyl accident consequences revealed that a considerable fraction of radioactivity is accumulated in minute soil grains. So, the separation of contaminated soil by size fractions makes it possible to extract and concentrate the major share of radioactivity in the fine fraction. Based on these researches water gravity separation technology was proposed by Bochvar Institute. The method extracts the fine fraction from contaminated soil. Studies carried out by Bochvar Institute experts showed that, together with the fine fraction (amounting to 10-20% of the initial soil), this technology can remove up to 85-90% of contaminating radionuclides. The resulting 'dirty' soil fraction could be packaged into containers and removed as radwaste, and decontaminated fractions returned back to their extraction site. Use of radiological and water gravity separations consequently increases the productivity of decontamination facility. Efficiency of this technology applied for contaminated soil cleanup was confirmed in the course of remediation of the contaminated territories near decommissioning research reactor in the Kurchatov Institute. For soil cleaning purposes, a special facility implementing the technology of water gravity separation and radiometric monitoring of soil decontamination products has been built and used on the site. This facility has processed over 10000 m³ of contaminated soil, including 1800 m³ sent for long-term storage as radwaste. In the remediation process, dedicated spectrometry and radiometry devices -in particular, the gamma locator and the 'RCG-09N' radiometer -were widely used, along with traditional dosimetric means, for characterizing the soil contamination and monitoring its distribution. Use of this spectrometric and radiometric equipment made it possible not only to successfully detect the contaminated soil spots and assess their surface contamination, but also to minimize the amount of extracted soil to be sent to soil cleanup facility. In addition, their use allowed remediation works to be monitored online on the spot, thus assuring exposure control and preventing unnecessary irradiation of personnel. (authors)