Heavy Ion Irradiation Effects on Fuel Simulation Materials Doped with Impurities

为了模拟高能裂变碎片对掺可燃毒物的核燃料的影响，我们在CeO_2中掺入Gd_2O_3或Er_2O_3，并用高能重离子辐照。研究了辐照引起的晶格结构的变化。我们已经发现，GdO_3或Er_2O_3的掺杂增强了辐照效应。计算机模拟结果表明，辐照主要破坏了UO_2中氧原子的有序排列，且UO_2中氧原子的无序排列比CeO_2中稳定得多。

To simulate the effect of high energy fission fragments on nuclear fuels doped with burnable poisons, we doped CeO2 with Gd2O3or Er2O3 and irradiated them with high energy heavy ions. The change in lattice structures by the irradiation was studied. We have found that the doping of GdO3 or Er2O3 enhanced the irradiation effect. The result of the computer simulation showed that the irradiation mainly destroyed the oxygen atom arrangements and the disordering of oxygen atom arrangement in UO2 is much stable than in CeO2.