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MoO4 2- ions were sorbed in calcined hydrotalcite contained in a column. It was found that 98% of 99mTc formed by 99Mo decay was eluted through the column in the form of pertechnetate. The content of radionuclides was determined by γ-spectrometry, and natural molybdenum was measured by neutron activation analysis. Solids were characterized by thermal analysis, X-ray diffraction, and infrared spectroscopy. Through batch experiments, the hydrotalcite capacity toward molybdate ions (1.12 × 10-3 M) was found to be 3.2 mequiv g-1. It was found that the high molybdate adsorbing capacity of calcined hydrotalcite could be utilized in designing a 99mTc generator made with low specific activity 99Mo-molybdate samples.

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Sodium zeolite X and sodium zeolite A have been exchanged with cesium solutions prepared from three cesium salts (chloride, nitrate, and acetate). Depending on the solution, the cesium cations were found to be located in different sites of the zeolite networks. If cesium acetate solution is used, then cesium reaches sites SII and SIII in the large cavity whereas if nitrate or chloride solutions are put in contact with zeolites, cesium is positioned only in sites SIII. This distribution determines the leaching behavior of the studied zeolites. When the samples were thermally treated to encapsulate partially the cesium cations, it was found that their behavior was different from the one observed in a previous work on cobalt exchanged X and A zeolites

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