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  • 1 Komi Branch of the USSR Academy of Sciences Institute of Biology 167610 Syktyvkar (USSR)
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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.