Simulation of Fast Neutron Radiography with a Time-of-Flight System

A novel fast neutron imaging method with Time-of-Flight was analyzed, which can provide a way to improve ratio of signal to noise for discrimination of scattered particles from the background, especially for bulky sample examination. For the same system spatial resolution, the length of each unit in scintillator detector array can be increased to improve detection efficiency, which is higher than for the traditional neutron image plate obviously. Key parameters such as detection efficiency and spatial resolution have been simulated by means of a Monte-Carlo method, and the ratio of signal to noise effect was estimated from MC and experimental results. Spatial resolution and contrast of compound sample have been calculated.