Setting the oxidation state of 99Tc adsorbed on Pt, by X-ray photoelectron spectroscopy

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An electrochemical method for the concentration of technetium 99mTc ions formed by neutron irradiation of a molybdenum target and required for visualization of internal organs in radiopharmaceutical diagnostics has been proposed. Technetium extraction was carried out by electrochemical method. It was found by X-ray photoelectron spectroscopy that the release of technetium at the cathode, due to electrochemical reduction of pertechnetate ions, occurs in the form of TcO2⋅xH2O. Due to oxidation of surface layers by air oxygen, some amount of Tc(VII) is formed in them: the ratio of Tc(IV): Tc(VII) amounts to 3:7. Under optimal conditions of the process, the efficiency of technetium extraction from the solution containing excess molybdate ions reached 90% during 0.5 h. Since the concentration of molybdenum compounds is small, the reduction of pertechnetate ions occurs with diffusion limitations. The diffusion coefficient of TcO4– ions determined by the rotating disk electrode method was 2.14×10–5 cm2 s–1.

作者简介

S. Veselov

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences; FGBOU VO “D. I. Mendeleev Russian University of Chemical Technology”

Moscow, Russia; Moscow, Russia

A. Teterin

SIC “Kurchatov Institute”

Email: antonxray@yandex.ru
Moscow, Russia

K. Maslakov

SIC “Kurchatov Institute”; Lomonosov Moscow State University

Moscow, Russia; Moscow, Russia

Yu. Teterin

SIC “Kurchatov Institute”; Lomonosov Moscow State University

Moscow, Russia; Moscow, Russia

V. Kuznetsov

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences; FGBOU VO “D. I. Mendeleev Russian University of Chemical Technology”

Moscow, Russia; Moscow, Russia

K. German

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences

Москва, Россия

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