A Time-of-flight neutron imaging detector using ZnS/LiF scintillator and wavelength shifting fibers with high spatial resolution and with low gamma-ray sensitivity

Nakamura, Tatsuya  ; To, Kentaro  ; Kawasaki, Takuro   ; Honda, Katsunori; Birumachi, Atsushi; Ebine, Masumi ; Sakasai, Kaoru  ; Soyama, Kazuhiko  ; Katagiri, Masaki*

The ZnS scintillator-based two-dimensional detector was developed for a time-of-flight neutron imaging with a high spatial resolution and a low -ray sensitivity. The detector is comprised of a thin ZnS scintillator with crossed wavelength-shifting-fibers (WLS fibers) arrays equipped with the fiber optic taper (FOT). The developed detector based on a neutron counting method has a high spatial resolution of less than 100 um (in FWHM) with a moderate count rate capability of several tens of thousands of cps. Of particular interest is its low -ray sensitivity of 10. Imaging capabilities of the detector are demonstrated by using a high-intensity pulsed neutron beam at the Materials and Life Science Experimental Facility in the Japan Proton Accelerator Complex (J-PARC/MLF).