Fast Neutron Imaging Telescope Using Statistical Reconstruction in Nuclear Emulsion

Abstract

Novel fast neutron imaging concept with statistical reconstruction for analysis of recoiled proton tracks in nuclear emulsion is proposed. For each recoiled proton track event, incident neutron direction can be constrained on a cone with axis of a recoiled proton track and an opening angle derived from both an estimated neutron energy and a recoiled proton energy. As in the Compton imaging method, a position of fast neutron source can be identified by intersection of event cones if appropriate information of the incident neutron energy is given. In reconstructed image obtained by this method for a 252 Cf source, single peak was appeared with the estimated neutron energy of lower than 1.5 MeV.