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Coincidence and time-of-flight measurement techniques are employed to tagfission neutrons emitted from a 252Cf source sealed on one side with a verythin layer of Au. The source is positioned within a gaseous 4He scintillatordetector. Together with alpha particles, both light and heavy fission fragmentspass through the thin layer of Au and are detected. The fragments enable thecorresponding fission neutrons, which are detected in a NE-213liquid-scintillator detector, to be tagged. The resulting continuouspolychromatic beam of tagged neutrons has an energy dependence that agreesqualitatively with expectations. We anticipate that this technique will providea cost-effective means for the characterization of neutron-detector efficiencyin the energy range 1 - 6 MeV.

Tagging fast neutrons from a 252Cf fission-fragment source