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Abstract <p>An electrochemical method has been proposed for concentrating the technetium <sup>99<i>m</i></sup>Tc ions formed during irradiation of a molybdenum target with neutrons and used for visualization of internal organs in radiopharmaceutical diagnostics. Technetium was isolated by the electrochemical method. An X-ray photoelectron spectroscopy study showed that technetium is released on the cathode in the form of TcO<sub>2</sub>⋅<i>x</i>H<sub>2</sub>O due to the electrochemical reduction of pertechnetate ions. As a result of the oxidation of the surface layers by atmospheric oxygen, a certain amount of Tc(VII) is formed in them: the ratio of the amounts of Tc(IV) : Tc(VII) is 3 : 7. Under the optimum process conditions, the efficiency of technetium extraction from a solution containing excess molybdate ions reached 90% within 0.5 h. Since the concentration of molybdenum compounds is low, the reduction of pertechnetate ions occurs with diffusion limitations. The diffusion coefficient of <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11504_2025_6207_Article_IEq1.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="43" /> </InlineMediaObject> <EquationSource Format="TEX">\({\text{TcO}}_{4}^{ - }\)</EquationSource> <!--PhysChA2570103Veselov-m1--> </InlineEquation> ions, determined by the rotating disk electrode method, was 2.14 × 10<sup>–5</sup> cm<sup>2</sup> s<sup>–1</sup>.</p>

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Establishing the Oxidation Degree of 99Tc Sorbed on Pt Using X-ray Photoelectron Spectroscopy

  • 期刊论文

  • 发表日期：

    2025年7月6日

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  • S. V. Veselov,
  • A. Yu. Teterin,
  • K. I. Maslakov,
  • Yu. A. Teterin,
  • V. V. Kuznetsov,
  • K. E. German

摘要

Abstract

An electrochemical method has been proposed for concentrating the technetium 99mTc ions formed during irradiation of a molybdenum target with neutrons and used for visualization of internal organs in radiopharmaceutical diagnostics. Technetium was isolated by the electrochemical method. An X-ray photoelectron spectroscopy study showed that technetium is released on the cathode in the form of TcO2⋅xH2O due to the electrochemical reduction of pertechnetate ions. As a result of the oxidation of the surface layers by atmospheric oxygen, a certain amount of Tc(VII) is formed in them: the ratio of the amounts of Tc(IV) : Tc(VII) is 3 : 7. Under the optimum process conditions, the efficiency of technetium extraction from a solution containing excess molybdate ions reached 90% within 0.5 h. Since the concentration of molybdenum compounds is low, the reduction of pertechnetate ions occurs with diffusion limitations. The diffusion coefficient of \({\text{TcO}}_{4}^{ - }\) ions, determined by the rotating disk electrode method, was 2.14 × 10–5 cm2 s–1.