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The article reports the results of 235 U burn-up measurements using 137 Cs activity technique for 12 nuclear fuel assemblies of WWR-SM research reactor after 3-year cooling time.The discrepancy between the measured and the calculated burn-up values was about 3%. To increase the reliability of the data and for cross-check purposes, neutron measurement approach was also used. Average discrepancy between two methods was around 12%.

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