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Neutron target research and development for BNCT: direct observation of proton induced blistering using light-polarization and reflectivity changes

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Abstract

The blistering problem due to high power proton irradiation is a crucial issue for any neutron generation target. When a proton beam irradiates a metal, the protons stopped inside capture free electrons in the metal to form a hydrogen gas. Eventually, blisters and/or flakes appear on the surface as the pressure of the hydrogen gas rises enough to cause ruptures. An experimental setup for observation of the metal surface that would have high sensitivity and high spatial resolution was proposed, designed and implemented. The system observes light-polarization and reflectivity and has successfully detected blistering surface dynamics.

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Acknowledgments

The authors wish to thank A. Matsumura and other members of the Ibaraki BNCT group, University of Tsukuba, Hokkaido Univ., Japan Atomic Energy Agency, Mitsubishi Heavy Industries, ATOX, Nippon Advanced Technology and Ibaraki Prefectural Government. The authors thank A. Takagi for his support in operating the Cockcroft-Walton accelerator, Tsukuba, KEK. This work was supported by the JSPS Grant-in-Aid for Scientific Research (B) Grant Number 23340080.

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Authors and Affiliations

  1. Accelerator Laboratory, KEK, Oho, Tsukuba, 305-0801, Japan

    T. Kurihara, H. Kobayashi, H. Matsumoto & M. Yoshioka

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  1. T. Kurihara
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  2. H. Kobayashi
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  3. H. Matsumoto
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  4. M. Yoshioka
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Correspondence to T. Kurihara.

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Kurihara, T., Kobayashi, H., Matsumoto, H. et al. Neutron target research and development for BNCT: direct observation of proton induced blistering using light-polarization and reflectivity changes. J Radioanal Nucl Chem 305, 935–942 (2015). https://doi.org/10.1007/s10967-015-4056-y

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  • DOI: https://doi.org/10.1007/s10967-015-4056-y

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