The results of observation of plutonium isotopes (238Pu and239,240Pu) vertical distribution dynamics (including mobile forms) in the profile of peaty-podzol-gley soil within 30 km limits from the Chernobyl Nuclear Power Station (ChNPS) are considered. Correlation of the plutonium distribution with some characteristics of the soil layers are discussed.
A method has been developed for the determination of microamounts of uranium in soils, which is based on application of the rapid and effective removing of luminescence quenchers from liquid preparations with subsequent uranium determination by laser-induced luminescence registration of its polysilicate complexes. To remove the luminescence quenchers, they were precipitated in strongly basic carbonate medium in the presence of activated charcoal (as a collector of the precipitate).
The paper considers the analytical procedure for determination of U and Th isotopes in environmental samples for those cases when coincentrations are on the background levells. The technique includes preconcentration operations with the use of ion-exchange and electrodeposition with the aim to obtain preparations for alpha-spectrometry. The preconcentration allows to use less complicated alpha-spectrometric installations.