The scintillation spectra, excited by 32P β radiation, and the photofluorescence spectra, excited by ultra-violet radiation, of solutions of TP, PPO, POPOP, DPA and pyrene in toluene and other aromatic solvents have been observed under similar conditions. All the spectra are found to be independent of the mode of excitation, within the experimental error. The influences of dissolved oxygen and of excimer formation on the observed spectra are considered.
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Birks et al. (1964) studied this question.
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