Advanced neutron shielding material using zirconium borohydride and zirconium hydride

T. Hayashi; K. Tobita; Y. Nakamori; S. Orimo

doi:10.1016/j.jnucmat.2008.12.073

Advanced neutron shielding material using zirconium borohydride and zirconium hydride

T. Hayashi, K. Tobita, Y. Nakamori, S. Orimo

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

68 Citations (Scopus)

Abstract

Neutron transport calculations have been carried out to assess the capability of zirconium borohydride (Zr(BH₄)₄) and zirconium hydride (ZrH₂) as advanced shield materials, because excellent shields can be used to protect outer structural materials from serious activation. The neutron shielding capability of Zr(BH₄)₄ is lower than ZrH₂, even though the hydrogen density of Zr(BH₄)₄ is slightly higher than that of ZrH₂. High-Z atoms are effective in neutron shielding as well as hydrogen atoms. The combination of steel and Zr(BH₄)₄ can improve the neutron shielding capability. The combinations of (Zr(BH₄)₄ + F82H) and (ZrH₂ + F82H) can reduce the thickness of the shield by 6.5% and 19% compared to (water + F82H), respectively. The neutron flux for Zr(BH₄)₄ is drastically reduced in the range of neutron energy below 100 eV compared to other materials, due to the effect of boron, which can lead to a reduction of radwaste from fusion reactors.

Original language	English
Pages (from-to)	119-121
Number of pages	3
Journal	Journal of Nuclear Materials
Volume	386-388
Issue number	C
DOIs	https://doi.org/10.1016/j.jnucmat.2008.12.073
Publication status	Published - 2009 Apr 30

ASJC Scopus subject areas

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

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title = "Advanced neutron shielding material using zirconium borohydride and zirconium hydride",

abstract = "Neutron transport calculations have been carried out to assess the capability of zirconium borohydride (Zr(BH4)4) and zirconium hydride (ZrH2) as advanced shield materials, because excellent shields can be used to protect outer structural materials from serious activation. The neutron shielding capability of Zr(BH4)4 is lower than ZrH2, even though the hydrogen density of Zr(BH4)4 is slightly higher than that of ZrH2. High-Z atoms are effective in neutron shielding as well as hydrogen atoms. The combination of steel and Zr(BH4)4 can improve the neutron shielding capability. The combinations of (Zr(BH4)4 + F82H) and (ZrH2 + F82H) can reduce the thickness of the shield by 6.5% and 19% compared to (water + F82H), respectively. The neutron flux for Zr(BH4)4 is drastically reduced in the range of neutron energy below 100 eV compared to other materials, due to the effect of boron, which can lead to a reduction of radwaste from fusion reactors.",

author = "T. Hayashi and K. Tobita and Y. Nakamori and S. Orimo",

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doi = "10.1016/j.jnucmat.2008.12.073",

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T1 - Advanced neutron shielding material using zirconium borohydride and zirconium hydride

AU - Hayashi, T.

AU - Tobita, K.

AU - Nakamori, Y.

AU - Orimo, S.

PY - 2009/4/30

Y1 - 2009/4/30

N2 - Neutron transport calculations have been carried out to assess the capability of zirconium borohydride (Zr(BH4)4) and zirconium hydride (ZrH2) as advanced shield materials, because excellent shields can be used to protect outer structural materials from serious activation. The neutron shielding capability of Zr(BH4)4 is lower than ZrH2, even though the hydrogen density of Zr(BH4)4 is slightly higher than that of ZrH2. High-Z atoms are effective in neutron shielding as well as hydrogen atoms. The combination of steel and Zr(BH4)4 can improve the neutron shielding capability. The combinations of (Zr(BH4)4 + F82H) and (ZrH2 + F82H) can reduce the thickness of the shield by 6.5% and 19% compared to (water + F82H), respectively. The neutron flux for Zr(BH4)4 is drastically reduced in the range of neutron energy below 100 eV compared to other materials, due to the effect of boron, which can lead to a reduction of radwaste from fusion reactors.

AB - Neutron transport calculations have been carried out to assess the capability of zirconium borohydride (Zr(BH4)4) and zirconium hydride (ZrH2) as advanced shield materials, because excellent shields can be used to protect outer structural materials from serious activation. The neutron shielding capability of Zr(BH4)4 is lower than ZrH2, even though the hydrogen density of Zr(BH4)4 is slightly higher than that of ZrH2. High-Z atoms are effective in neutron shielding as well as hydrogen atoms. The combination of steel and Zr(BH4)4 can improve the neutron shielding capability. The combinations of (Zr(BH4)4 + F82H) and (ZrH2 + F82H) can reduce the thickness of the shield by 6.5% and 19% compared to (water + F82H), respectively. The neutron flux for Zr(BH4)4 is drastically reduced in the range of neutron energy below 100 eV compared to other materials, due to the effect of boron, which can lead to a reduction of radwaste from fusion reactors.

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