Migration of plutonium isotopes in forest soil profiles in Lublin region (Eastern Poland)

The distribution of Pu isotopes in three profiles of forest soil in Lublin region was determined. The retention half-time and migration velocity of Pu -239,Pu-240 originated from global and Chernobyl fallouts was calculated. T he average rate of migration of the global fallout plutonium was 0.4 cm/yea r and that of the Chernobyl one 0.7 cm/year. Good correlation between Pu co ncentration and organic matter contents was found only in the case of podzo lic soil profile. In two profiles a good negative correlation between Pu ac tivity and exchangeable pH of the soil layer was determined.