A liquid scintillator fast neutron double-scatter imager

A liquid scintillator fast neutron imager based on double-scatter neutron detection is in development for the purpose of identifying and locating special nuclear materials. A prototype instrument is being tested consisting of two planes of four 1 m × 5 cm × 5 cm liquid scintillator detectors each viewed at either end by a photomultiplier tube. The instrument is capable of reconstructing energy and location of a source of fast neutrons via time-of-flight and neutron double-scatter techniques. Pulse shape discrimination is utilized to separate neutron signals from gamma-ray background.