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A Two-dimensional scintillation-based neutron detector with wavelength-shifting fibers and incorporating an interpolation method

Nakamura, Tatsuya  ; To, Kentaro  ; Kawasaki, Takuro   ; Ebine, Masumi ; Birumachi, Atsushi; Sakasai, Kaoru  ; Soyama, Kazuhiko  

A two-dimensional scintillation neutron detector incorporating an interpolation method readout by wavelength-shifting (WLS) fiber was developed to make an effective pixel size smaller than the physical pitch of the WLS fibre array. The detector that was made with the crossed arranged WLS fiber arrays where the fibers were placed in a regular pitch of 2.5 mm in $$x$$ and $$y$$ directions. The dedicated signal processing algorithms that calculated an incident position of neutron with a base length of the same, half and quarter of the physical WLS fiber pitch were developed for the detector operated in a photon-counting method. The paper demonstrated the feasibility of the developed interpolation method using a collimated neutron beam.

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