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Radiation Protection Dosimetry 2004 110(1-4):619-622; doi:10.1093/rpd/nch136
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Radiation Protection Dosimetry Vol. 110 Nos. 1-4 © Oxford University Press 2004; all rights reserved

Development of a tiny neutron probe with an optical fibre for BNCT

Y. Ito1, G. Katano1, H. Harano1, T. Matsumoto1, A. Uritani1,*, K. Kudo1, K. Kobayashi2, T. Yoshimoto2, Y. Sakurai2, T. Kobayashi2 and C. Mori3

1 National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan
2 Research Reactor Institute, Kyoto University, Kumatori 590-0494, Japan
3 Faculty of Engineering, Aichi Institute of Technology, Toyota 470-0392, Japan

* Corresponding author: a-uritani{at}aist.go.jp

We have developed a tiny neutron probe detector as a monitor of a thermal neutron flux for boron neutron capture therapy. The detector consists of an optical fibre and a small neutron probe. We have used a film-like ZnS(Ag) scintillator and a 6LiF neutron converter for the neutron probe. In order to improve the gamma–neutron discrimination ability, vacuum evaporation of 6LiF onto the ZnS(Ag) film has been done. In order to improve the neutron detection efficiency, we made use of a wavelength-shifting fibre as the probe material. The characteristics of the above two types of fibre probe detector have been evaluated experimentally.


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