@misc{oai:repo.qst.go.jp:00085494, author = {Sato, K. and Hirabaru, M. and Onoue, M. and Hatakeyama, M. and Xu, Q. and Watanabe, Y. and Nozawa, T. and Yoshiyuki, Watanabe and Takashi, Nozawa}, month = {Oct}, note = {In fusion reactor materials, a large amount of gas atoms are formed by the nuclear reaction. The hydrogen isotopes interact with the irradiation-induced defects, and remain in the materials. Retention of hydrogen isotopes leads to a decrease in mechanical properties of materials, e.g. hydrogen embrittlement. Therefore, to study the interaction between hydrogen and defects is especially important. Positron annihilation spectroscopy (PAS) is a non-destructive technique for detecting vacancy type defects. In this study, the possibility of quantitative evaluation of hydrogen atoms trapped at vacancy-type defects using the PAS was investigated in the tungsten hydrogen-charged under different conditions., 20th International Conference of Fusion Reactor Materials}, title = {Effect of Carbon on Quantitative Evaluation of Hydrogen Atoms Trapped at Vacancy-type Defects Using Positron Annihilation Spectroscopy in Tungsten}, year = {2021} }