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131Ba as a promising SPECT-diagnostic match for 223/224Radium

Reissig, F.; Bauer, D.; Ullrich, M.; Kreller, M.; Pietzsch, J.; Kopka, K.; Pietzsch, H.-J.; Walther, M.; Mamat, C.

We recognize 131Ba as a SPECT radionuclide, which provides a diagnostic match for the therapeutic alpha-emitting radionuclides 223Ra and 224Ra. The gamma-emitter barium-131 (t½ = 11.5 d) decays with an energy of 123.8 keV (30% intensity) of the first decay via cesium-131 (t½ = 9.7 d) to stable xenon-131, each by electron capture. Our aim was to develop of a straightforward resin-based radiochemical separation to yield 131Ba with high radionuclide purity. Furthermore, the radiolabeling of the complexing agent macropa with [131Ba]Ba2+ using mild labeling conditions was intended. For this purpose, different TLC systems as reaction control were utilized. The radiopharma-cological characterization of 131Ba-labeled macropa in comparison to uncomplexed [131Ba]Ba2+ was carried out in healthy mice, including biodistribution and small animal SPECT/CT experiments.

Keywords: alpha therapy; Barium-131; Radium-224; SPECT

  • Lecture (Conference) (Online presentation)
    eSRS 2021 Virtual Meeting, 17.-19.05.2021, Nantes, France
  • Abstract in refereed journal
    Nuclear Medicine and Biology 96-97/S1(2021), S107
    DOI: 10.1016/S0969-8051(21)00423-6

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  • Secondary publication expected from 17.05.2022

Permalink: https://www.hzdr.de/publications/Publ-32660
Publ.-Id: 32660