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The possibility of Tc precipitation with organic complexes of Fe(II) from nitric acid solutions was studied. Ferroin nitrate (o-phenantroline complex of iron(II)) was chosen as the optimal precipitant for the TcO 4 -immobilization. The conditions for maximum Tc yield (93 ± 5 %) were determined and the composition of formed sediments was studied. Fe-Tc matrix can be obtained by thermal treatment of the formed sediments in the reductive atmosphere. The process of thermal treatment of the precipitates was studied. The obtained Fe-Tc matrix was tested for Tc leaching and showed a high resistance to the environment.

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