The ratio of a-stimulated to pstimulated luminescence, the a/S ratio, has been studied in binary and ternary organic scintillation solutions. This ratio has been found to vary with the decay time of the solvent and/or the solute. To explain the low fluorescence yield under a-particle excitation, transient free radicals produced along the a-track are assumed to contribute to the dynamic quenching parameter.* work performed under the auspices of the U.S. Atomic Energy Commission.

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