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High-purity chromatographic methods for separating five pairs of neighboring lanthanide elements (Tm/Er, Gd/Eu, Eu/Sm, Sm/Pm, and Pm/Nd) have been developed for the purpose of producing radioactive targets for neutron capture experiments. The methods employ high-performance liquid chromatography (HPLC) with CS-3 Dionex cation exchange columns that were optimized for each set of elements to obtain...
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