Irradiation effects on thermal diffusivity and positron annihilation lifetime in ceramics induced by neutron and 30 MeV electron |
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| Authors: | Masafumi Akiyoshi Hidetsugu Tsuchida Ikuji Takagi Toshimasa Yoshiie Xu Qiu Koichi Sato |
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| Affiliation: | 1. Department of Nuclear Engineering, Kyoto University , Yoshida-Honmachi, Sakyo-ku , Kyoto , 606-8501 , Japan akiyoshi@nucleng.kyoto-u.ac.jp;3. Department of Nuclear Engineering, Kyoto University , Yoshida-Honmachi, Sakyo-ku , Kyoto , 606-8501 , Japan;4. Research Reactor Institute, Kyoto University , Kumatori-cho , Osaka 590-0494 , Japan |
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| Abstract: | Measurements of thermal diffusivity and positron annihilation lifetime were performed on neutron- and 30 MeV electron-irradiated ceramics. Thermal diffusivity of heavily neutron-irradiated ceramics decreased to a very low level and the difference between specimens was small. Positron annihilation lifetime of these specimens also showed a distinct change; however, the difference between specimens was also small. Accordingly, in this study, electron irradiation was performed to 0.01–0.02 dpa via the 30 MeV KURRI-Linac. The electron-irradiated specimens also showed obvious degradation in thermal diffusivity and an increment in positron annihilation lifetime, and it was clarified that positron annihilation lifetime showed some correlation with thermal diffusivity. |
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| Keywords: | ceramics neutron irradiation 30 MeV electron irradiation irradiation damage thermal diffusivity positron annihilation lifetime (PAL) |
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