Vertical profile of Cs137 in soil fifteen years after Chernobyl nuclear accident

Abstract

The subject of research in this paper is the vertical distribution of the 137Cs in undisturbed soil. The presence of the 137Cs in the soil is largely a result of the Chernobyl’s accident, which occurred in 1986. Soil samples were taken in central Serbia, in the surroundings of the city of Kragujevac during year 2001. Specific activities of the 137Cs in soil samples were measured by gamma spectrometric method using coaxial germanium detector HPGe. Fifteen years after the Chernobyl accident the largest activity of the 137Cs is within 10 cm of the upper layer of the soil. The obtained result shows that the migration of Cs in soil is a very slow process.

Predmet istraživanja u ovom radu je vertikalna raspodela koncentracije 137Cs u tlu. Prisustvo 137Cs u tlu je u najvećoj meri posledica akcidenta u Černobilju, koji se dogodio 1986. godine. Uzorci zemlje su uzimani na teritoriji centralne Srbije, u okolini Kragujevca u toku 2011. godine. Specifična aktivnost 137Cs u uzorcima tla je merena gama-spektrometrijskom metodom pomoću poluprovodničkog germanijumskog detektora. Nađeno je da je najveća aktivnost 137Cs u površinskom sloju tla od 10 cm. Dobijeni rezultat pokazuje da je migracija 137Cs veoma spor proces