Determination of the Oxidation State of the 99Tc Technetium Isotope on Activated Carbon by X-Ray Photoelectron Spectroscopyстатья
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Аннотация:The oxidation state of 99Tc adsorbed on the surface of AG-3 (I) and KAU (II) activated carbon from an aqueous potassium pertechnetate (KTcO4) solution has been studied by X-ray photoelectron spectroscopy at binding energies Eb in the range from zero to 1250 eV. The measured Eb(Tc 3d5/2) in sample I is 260.0, 258.2, and 258.3 eV, indicating the presence of three states: Tc7+, Tc5+, and Tc3+. The Tc 3d electron spectrum of the surface of sample II shows only two spin doublets, corresponding to two oxidation states of technetium, Tc3+ and Tc5+, in the ratio 23 : 77.