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High-Resolution Penumbral Imaging of 14-MeV Neutrons
Yen-Wei CHEN Noriaki MIYANAGA Minoru UNEMOTO Masanobu YAMANAKA Tatsuhiko YAMANAKA Sadao NAKAI Tetsuo IGUCHI Masaharu NAKAZAWA Toshiyuki IIDA Shinichi TAMURA
IEICE TRANSACTIONS on Electronics
Publication Date: 1995/12/25
Print ISSN: 0916-8516
Type of Manuscript: PAPER
penumbral imaging, neutron image, laser fusion, toroidal aperture, scintillator array, gated image intensifier,
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We have developed a neutron imaging system based on the penumbral imaging technique. The system consists of a penumbral aperture and a sensitive neutron detector. The aperture was made from a thick (6 cm) tungsten block with a toroidal taper. It can effectively block 14-MeV neutrons and provide a satisfactory sharp, isoplanatic (space-invariant) point spread function (PSF). A two-dimensional scintillator array, which is coupled with a gated two-stage image intensifier system and a CCD camera, was used as a sensitive neutron detector. It can record the neutron image with high sensitivity and high signal-to-noise ratio. The reconstruction was performed with a Wiener filter. The spatial resolution of the reconstructed neutron image was estimated to be 31 µm by computer simulation. Experimental demonstration has been achieved by imaging 14-MeV deuterium-tritium neutrons emitted from a laser-imploded target.