A fast neutron scintillator adapted to end-window photomultipliers is described for neutron detection above ∼0.3-Mev energy. Light pulses are produced by the action of recoil protons from paraffine on zinc sulfide phosphor, the optimum weight ratio of the paraffine-zinc sulfide mixture being 3:2. Interfering gamma-ray pulses are suppressed by a 3 microsecond time-constant in the photomultiplier output circuit, and subsequent amplitude discrimination. A detection efficiency of 3.8 percent is attained for 4.1-Mev neutrons through the incorporation of ½-inch deep Lucite light guides.
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W. S. Emmerich (1954) studied this question.
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