Preparation of Aqueous and Organic Scintillation Fluid

Dissolve 4.0 g PPO (2,5-diphenyloxazole) and either 0.050 g POPOP [p-bis(5-phenyloxazol-2-yl)benzene] or 0.080 g bis-MSB [p-bis(o-methylstyryl)benzene] in 1 liter of a solution composed of 667 ml toluene and 333 ml Triton X-100. Make certain that the contents are completely dissolved before the solution is used. This solution should be stored in a brown bottle in a cool dark space. 

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