Determination of Gd concentration profile in UO2-Gd2O3 fuel pellets

作者：Tobia D^*; Winkler E L; Milano J; Butera A; Kempf R; Bianchi L; Kaufmann F

来源：Journal of Nuclear Materials, 2014, 451(1-3): 207-210.

DOI：10.1016/j.jnucmat.2014.03.054

A transversal mapping of the Gd concentration was measured in UO2-Gd2O3 nuclear fuel pellets by electron paramagnetic resonance spectroscopy (EPR). The quantification was made from the comparison with a Gd2O3 reference sample. The nominal concentration in the pellets is UO2: 7.5% Gd2O3. A concentration gradient was found, which indicates that the Gd2O3 amount diminishes towards the edges of the pellets. The concentration varies from (9.3 +/- 0.5)% in the center to (5.8 +/- 0.3)% in one of the edges. The method was found to be particularly suitable for the precise mapping of the distribution of Gd3+ ions in the UO2 matrix.

• 出版日期2014-8