Efficiency of Energy Transfer in a Solution of PPO in Xylene

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Abstract
The nonradiative energy transfer of an organic scintillating solution as a function of the solute concentration has been determined by three independent methods: namely, direct measurements of the fluorescent lifetime, the light output of the solvent, and the light output of the solute. The efficiency of energy transfer ranges from 12% at 0.02 g/l, to 92% at 2 g/l of PPO in xylene. The results from the three methods agree within a few percent.