Abstract
The liquid chromatographic determination of the fission monitor /sup 139/La has been examined for the determination of the number of fissions and burnup in UO/sub 2/ fuels. Lanthanum was separated from the fuel and other fission products on a reversed phase dynamically modified with 1-octanesulfonate, and eluted metal ions were detected after an on-line postcolumn reaction with Arsenazo III. The relative standard deviation for lanthanum determinations done over a 2-week period was 0.6%. The agreement between the chromatographic procedure and standard mass spectrometric procedures using /sup 145 +146/Nd as a fission monitor was within approx. 2%; the majority of this 2% difference was attributed to uncertainties in the accepted values for fission yields. The agreement between chromatographic and mass spectrometric procedures for the determination of La in fuel solutions was within approx. 1%. 15 references, 5 figures, 4 tables.
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