A STUDY ON THE DEVELOPMENT OF A FAST-NEUTRON TELEVISION CONVERTER

Experiments on fast neutron radiography (FNR) were carried out using t he fast neutron source reactor YAYOI of the University of Tokyo. For a real time imaging technique using FNR, for a fast neutron television system (FNR-TV), it is essential to develop a highly sensitive lumines cent converter in order to obtain good quality images. A new converter was recently developed and tested. It showed an about six times highe r sensitivity compared with the first prototype converter. In this pap er, the characteristics of the converter are discussed as well as the clearer images of a FNR-TV when using the converter. The FNR-TV images were obtained with 500 frames integrated. A small hole (1.0 mm in dia meter and 10 mm in depth) in an acrylic plate was well imaged through a 50 mm thick iron block. A 0.15 mm thick aluminum spacer in the calib rated fuel pin was also discernible.