A digital approach to neutron–γneutron–γ imaging with a narrow tungsten collimator aperture and a fast organic liquid scintillator detector

A digital neutron–γneutron–γ imaging technique for mixed radiation field is described. The imaging system is based upon an organic liquid scintillator detector, a narrow tungsten collimator, fast digitiser and adjustable equatorial mount. Radioactive sources have been attached to a vertical plane and the digitiser has been used to digitise neutron and γγ events. The digitised events have been discriminated using pulse gradient analysis and images have been generated of the count distribution in the source plane.

► Describe a digital neutron-gamma imaging technique for mixed radiation fields. ► Examine the imaging quality using a narrower tungsten collimator. ► Pulse gradient analysis for discrimination of neutrons and gamma-rays.