Development of imaging techniques for fast neutron radiography in Japan

Abstract Neutron radiography with fast neutron beams (FNR) has been studied at the fast neutron source reactor “YAYOI” of the University of Tokyo since 1986. Imaging techniques for FNR have been developed for CR-39 track-etch detector, electronic imaging system (television method), direct film method, imaging plate and also fast and thermal neutron concurrent imaging method. The review of FNR imaging techniques and some applications are reported in this paper.