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An Expedient Method for the Separation of Fission Product Lanthanum

The separation of lanthanum is found to be easily performed by elution through a Dowex 50W-X8 cation exchange column using 0.45 M 2-methyl lactic acid as the eluting agent. The elution is preceded by the precipitation of lanthanum and contaminating rare earths aa fluorides and hydroxides. The separation requires about 2 hrs with decontamination factors of 10 calculated for the separation of lanthanum from mixed fission products. Chemical yields were found to range between 40-50%.