Induced radioactivity of commercial isotropic graphites for high heat flux tiles

T. Shikama; H. Kayano; M. Fujitsuka; T. Tanabe

doi:10.1016/0022-3115(91)90063-D

Induced radioactivity of commercial isotropic graphites for high heat flux tiles

T. Shikama, H. Kayano, M. Fujitsuka, T. Tanabe

Institute for Materials Research (IMR)

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	209-213
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	179-181
Issue number	PART 1
DOIs	https://doi.org/10.1016/0022-3115(91)90063-D
Publication status	Published - 1991 Jan 1

ASJC Scopus subject areas

Nuclear and High Energy Physics
Materials Science(all)
Nuclear Energy and Engineering

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abstract = "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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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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Induced radioactivity of commercial isotropic graphites for high heat flux tiles

Abstract

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