Abstract
Because for 252Cf the number of neutrons and gamma rays and the energy spectrum of particles from spontaneous fission are well characterized, it can be used as a timed source of fission neutrons and gamma rays. This paper describes a timed source of neutrons and gamma rays made by depositing 252Cf on one electrode of a parallel-plate ionization chamber that can then be used for determining detection-system characteristics. This well characterized source of neutrons can thus be used as a randomly pulsed source for a variety of applications. This paper illustrates the use of this type of source to determine the time resolution of detection systems, the efficiency for detection of neutrons between 0.5 and 5 MeV, the effectiveness of pulse-shape discrimination systems, and the overall efficiency for detection of prompt fission gamma rays.
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