The characteristics of various liquid scintillators have been determined under conditions such that their performance in \.e:y large counters can be predicted. Mixtures based on medicinal paraffin are found to be highly transparent with effective attenuation lenghts of nearly 2 metres. The addition of Shellsol A, acting as a secondary solvent. can give a scintillation efficiency about half of the best toluene based scin?illators, with greater stability and freedom from fire hazard.
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