Quenching of the Scintillation from a γ-Irradiated Cyclohexane Solution Containing p-Terphenyl by Electron Scavengers, Positive Ion Interceptors and Some Hydrocarbons

Abstract

The luminescence from a cyclohexane solution containing p-terphenyl irradiated with 60Co γ-rays has been quenched by various compounds. The quenching efficiencies were found to be in the following order; sulfur hexafluoride∼carbon tetrachloride>nitrous oxide>ethanol>ammonia>carbon dioxide. These compounds are known in radiation chemistry as electron scavengers or as positive-ion interceptors. Cyclopropane and ethylene have also shown an appreciable quenching ability, but n-butane has shown scarecely any. These results have been explained by assuming that ionic reactions are responsible for the luminescence from a cyclohexane-p-terphenyl scintillator.

Radiolysis transients in viscous liquids. Biphenyl in liquid paraffin

“…In what follows we attempt to give quantitative expression to this concept. 8. Semiempirical Treatment of Viscosity-Diffusion-Temperature Correlations.…”

“…There is an accumulation of evidence for formation of excited states, triplet as well as singlet, through ion recombination in other types of solvent. [7][8][9][10] McCollum and Nevitt4 find that pulse radiolysis and flash photolysis give similar ratios of singlet and triplet yields for aromatic solutes in liquid paraffin and conclude that processes unique to radioexcitation-notably ion recombination-produce little or no triplet excitation.…”