Time-of-flight neutron radiography with a blanking-type image intensifier

The accelerator-based pulsed neutron radiography has an advantage to analyze the neutron energy dependent image by time-of-flight (TOF) technique. One of the novel imaging devices is the neutron image intensifier, and for the usage at the pulsed source the high speed camera is used for recording. Recently, the vacuum type image intensifier with a shutter function has been developed. It has the timing gate of converging lens, and the gate works on a suitable timing in the neutron single pulse. In this procedure the most part of the neutron pulse is wasted, but this combination of the blanking image intensifier and the normal speed camera is the primary stage for improving the system, because it can use full sensor ability. We applied the system to the Bragg edge radiography of Fe, and confirmed the function worked well at the Hokkaido University compact source.