你能看到铀238有很高的能量8，有一个横截面在一些方式下，能够用于快速反应堆中。
And you can see a very high energy as uranium 238 does have a fission cross section which in some ways can be used in fast reactors.
在反应堆物理设计和分析时，经常要进行微扰计算，以快速分析堆芯中子截面扰动下反应性的变化量。
Perturbation calculation will be required to rapidly determine the changes of reactivity caused by core neutron cross sections perturbation in reactor physics design and analysis.
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