Abstract
Fast neutron radiography (FNR) has been studied at the fast neutron source reactor of the University of Tokyo, whose average neutron energy is 1MeV. Four beam holes of YAYOI reactor are utilized at the FNR experiments, collimator ratios of which are 37, 74, 75 and 133 respectively. The fast neutron flux at these YAYOI-FNR positions is above 106n/cmcm2·s at the YAYOI maximum operating power of 2kW. In the present FNR experiments, a CR-39 nuclear track detector has been used successfully.Comparative studies between FNR and thermal neutron radiography (TNR) make it clear that the FNR technique is superior to the TNR technique in the applicability to imaging of bulky and thick material, 100mm thickness, which are made of plastic and steel. As an extensive application of the FNR technique, imaging results of natural and depleted uranium block sample have been successfully obtained.And in order to get the prompt imaging result, a fast neutron television system (FNR-TV) has been developed. The first testing of this FNR-TV can be successfully obtained.
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