Abstract
A pulse-shape discriminator circuit was used for the measurement of the pulse heights of the slow components of light pulses from organic scintillators excited by different types of particles: electrons, protons, alpha particles, and fission fragments. Three types of organic scintillators were employed: a crystal (stilbene), a liquid (7 g PPO and 0.5 g M2-POPOP in 1 liter of toluene), and a plastic (NE-150). The relationship of the pulse heights of the slow components for excitation with electrons, protons, and alpha particles was similar for all three scintillators. However, fission fragments produced a slow component pulse height similar to protons in stilbene and the plastic but more like electrons in the liquid. The pulse-height distributions of total light pulses from the scintillators excited by the alpha and spontaneous fission emissions of Cf252 were measured. The alpha-particle and fission-event spectra were resolved only with the liquid scintillator giving a pulse-height spread of the fission distribution peak of 40%. From the maximum of the fission sepctra it was calculated that the most probable energy of fission produced the same pulse height as an electron with 1/75th that energy would produce. The alpha particles and the fission events were counted with 100% efficiency and a value of 31.0±0.5 was obtained for the alpha to fission disintegration ratio of Cf252.
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