| 摘要 |
A 6Li doped glass scintillator sheet is provided with grooves that are cut at given spacings in both a horizontal and a vertical direction. Bundles of wavelength shifting fibers are placed in the vertical grooves and a fluorescence reflector Al2O3 is buried in the horizontal grooves to make a group of detection pixels as separated by the horizontal and vertical grooves. Neutron detecting mediums which are each a mixture of YAlO3:Ce in powder form with a neutron converter 6LiF are provided on the top surface of the scintillator. Bundles of wavelength shifting fibers are also arranged horizontally on the bottom surface of the scintillator. The fluorescence generated by stimulation with the neutrons entering the detection pixels and the fluorescence generated by stimulation with the neutrons incident on the neutron detecting mediums are detected by the bundles of wavelength shifting fibers placed in the vertical grooves and the bundles of wavelength shifting fibers arranged on the bottom surface of the scintillator. The detected fluorescence is converted to electric signals with a multi-channel photomultiplier tube. On the basis of these electric signals, pulse signals for simultaneous counting are generated from a retriggerable, constant time-duration pulse generator and recorded as time-series data by parallel interfaces. The recorded data are analyzed by the simultaneous counting method to produce a two-dimensional neutron image.
|
