Abstract
The mass spectrometric technique has been applied to the determination of burnup of an irradiated fuel of JRR-1 (20% 235U, uranyl sulfate solution). Three different methods were used, based respectively on uranium isotopic ratio, and on the measurement of stable fission-product neodymium and molybdenum. The isotopic ratios were measured with a surface ionization type mass spectrometer.The uranium isotopic ratio method consists of the measurement of isotopic change of uranium before and after irradiation. in the neodymium and molybdenum methods, uranium and fission-products neodymium and molybdenum were determined by isotope dilution-mass spectrometry using natural uranium, 150Nd and 96Mo, respectively, as spikes. The burnup was calculated from the ratios of concentration reffered to uranium presented by neodymium and molybdenum. While chemical separation is essential prior to mass spectrometry, quantitative recovery of these three elements are not necessary. The results obtained by three methods are in good agreement, and the neodymium method was found to be best in sensitivity, precision and accuracy.
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