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中文摘要：
运用于反应堆的永久磁铁处于中子辐照的恶劣环境，而辐照将会影响永久磁铁的性能。为评估中子辐照对永磁铁性能的影响程度，利用欧洲活化计算系统EASY-2007对耐2a中子辐照的Sin（Co0.82，Fe0.1，Cu0.06，Zr0.02），7.2永磁铁进行辐照计算，通过分析元素成分的变化来推测磁性能的衰减情况。结果表明，辐照后的永磁铁中Fe元素含量变化不大，而Sm元素含量大幅降低，这使得矫顽力降低严重。
英文摘要：
The permanent magnet applied in reactor is in the adverse circumstances of neutron radiation-induced demagnetization, and the functions of permanent magnet will be influenced by irradiation. To investigate the performance of permanent magnetic materials under neutron radiation, the activation calculations of Sm （Co0.8z, Fe0.1, Cu0.06, Zr0.02）z.2 permanent magnet after 2 a neutron radiation were carried out with the European activation system EASY-2007. Then the magnetic attenuation can be predic- ted by analyzing the changes of elemental composition. The result shows that Fe content changes little after neutron radiation, but Sm content decreases significantly, which makes coercivity decrease seriously.
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