Super resolution for resonance absorption imaging by reconstruction with sub-pixel shifting

The neutron resonance absorption imaging [1] is very competent technique to analyze the concentration of specific fissile nuclides in nuclear fuel pellets. To take transmitted image of neutrons with the relatively high energy of tens of eV and with the time resolution of 100 ns, a neutron GEM detector was used. However, the spatial resolution of this imaging detector is insufficient for conformity inspection. To solve this problem super-resolution method with sub-pixel shifting and calculation had been experimentally tried using a thick-GEM with the pixel resolution of 0.8 mm. From the reconstruction of 16 images taken by sub-pixel shift 1.0 mm Cd line pair was clearly recognized.