TY - JOUR
T1 - Induced radioactivity of commercial isotropic graphites for high heat flux tiles
AU - Shikama, T.
AU - Kayano, H.
AU - Fujitsuka, M.
AU - Tanabe, T.
N1 - Funding Information:
The authors express their thanks to Prof. S. Mitsu-gashira and Mr. Y. Suzuki at Tohoku University for their collaboration in the present y-ray spectroscopy. This work was partly supported by a Grant-in-Aid for Fusion Research from the Ministry of Education, Science and Culture in Japan.
PY - 1991
Y1 - 1991
N2 - It used as the plasma-facing material in the next-generation fusion devices, graphite will induce radioactivity in impurities in the graphite. This study was carried out to evaluate the amount of radiologically significant impurities in commercial isotropic graphite tiles. Special attention is given to the benefits of purification by halogen treatment. Graphite tiles from seven Japanese companies were irradiated in JMTR to neutron fluences up to 7.7 × 1024 n/m2 fast (E > 0.1 MeV) and 1 × 1025 n/m2 thermal (E < 0.683 eV) at about 450 K. Subsequent γ-ray spectroscopy revealed that major impurities contributing to the induced radioactivity are the IIId, IVa, Va elements and rare earth elements. The origins of these impurities are suggested and the effects of halogen treatment on the reduction of these impurities are analyzed.
AB - It used as the plasma-facing material in the next-generation fusion devices, graphite will induce radioactivity in impurities in the graphite. This study was carried out to evaluate the amount of radiologically significant impurities in commercial isotropic graphite tiles. Special attention is given to the benefits of purification by halogen treatment. Graphite tiles from seven Japanese companies were irradiated in JMTR to neutron fluences up to 7.7 × 1024 n/m2 fast (E > 0.1 MeV) and 1 × 1025 n/m2 thermal (E < 0.683 eV) at about 450 K. Subsequent γ-ray spectroscopy revealed that major impurities contributing to the induced radioactivity are the IIId, IVa, Va elements and rare earth elements. The origins of these impurities are suggested and the effects of halogen treatment on the reduction of these impurities are analyzed.
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U2 - 10.1016/0022-3115(91)90063-D
DO - 10.1016/0022-3115(91)90063-D
M3 - Article
AN - SCOPUS:44949277596
VL - 179-181
SP - 209
EP - 213
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
SN - 0022-3115
IS - PART 1
ER -