INDUCED RADIOACTIVITY OF COMMERCIAL ISOTROPIC GRAPHITES FOR HIGH HEAT-FLUX TILES

被引：4

作者：

SHIKAMA, T ^{[1
]}

KAYANO, H ^{[1
]}

FUJITSUKA, M ^{[1
]}

TANABE, T ^{[1
]}

机构：

[1] NATL RES INST MET, TSUKUBA LABS, TSUKUBO, IBARAKI 305, JAPAN

来源：

JOURNAL OF NUCLEAR MATERIALS | 1991年 / 179卷

关键词：

D O I：

10.1016/0022-3115(91)90063-D

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

If 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 x 10(24) n/m2 fast (E > 0.1 MeV) and 1 x 10(25) n/m2 thermal (E < 0.683 eV) at about 450 K. Subsequent gamma-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.

引用

页码：209 / 213

页数：5

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