He Wei-Di, Zhang Pei-Yuan, Liu Xiang, Tian Xue-Fen, Fu Xin-Ge, Deng Ai-Hong. Defects in H/He neutral beam irradiated potassium doped tungsten alloy by positron annihilation techniqueJ. Acta Physica Sinica, 2021, 70(16): 167803. DOI: 10.7498/aps.70.20210438