辐照后基体中的缺陷不断产生、迁移和团聚，形成团簇、位错、位错环、空洞和析出相等更大尺度缺陷。空位的产生以及平衡浓度可以通过其形成能反映。计算了不同尺寸空位团簇形成能。

After irradiation, defects in the matrix continue to generate, migrate and agglomerate, forming clusters, dislocations, dislocation rings, voids and precipitates of the same larger scale defects. The formation of vacancies and the equilibrium concentration can be reflected by their formation. The formation energies of vacancy clusters with different sizes are calculated.