The data of uranium isotope abundance ratios measured by thermal ionization mass spectrometer MAT-261 were analyzed in the three aspects including distribution function, correlation and uncertainty. The measurement data were confirmed to be normal distribution. Uncertainty and correlation of the isotope abundance ratios measured by MAT-261 in the certified uranium sample were investigated. The conclusion obtained indicated that, the correlation only between abundance ratios R5/8 and R4/8 is strong, but the others is weak for the enriched uranium sample; For the natural uranium sample, the correlation among all abundance ratios is weak. On this base, the uncertainty of all abundance ratios measured by MAT-261 had been evaluated.
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