Dislocation and dislocation tangles could be observed for specimen irradiated by Fe(superscript +) ions while very small black dot can be seen for specimen irradiated by He(superscript +) ions.

• 铁离子辐照后试样表层辐照缺陷主要由高密度位错和位错缠结构成，氦离子辐照后表层辐照缺陷主要由细小致密的黑斑构成。