The study of sorption of Ra-223 by a thin-layer manganese dioxide sorbent

The work focuses on sorption of radium by a thin-layer MnO2−CTA sorbent. The maximal sorption of Ra (≈ 90%) was achieved after one day of sorption. For Ra, decrease of quality of alpha spectrum was observed during sorption that can be explained by its diffusion into MnO2 layer. The average thickness of the sorption layer was determined to be 4.56 μm, whereas the energy loss of 5 MeV α-particles in MnO2 is approximately 270 keV per μm. Optical microphotographs confirmed flat morphology of the sorbent's surface and no morphology changes as a result of sorption.