MicroScint™-PS cocktail was specifically formulated for polystyrene compatibility. It is suitable for use with virtually any type of microplate and provides long term counting stability. MicroScint™-PS has almost identical sample handling capabilities to MicroScint™-20 cocktail with respect to sample concentration and loading. MicroScint™-PS cocktail provides high counting stability with minimal change in count rate within 24 hours. In addition, it has lower viscosity and is therefore easier and quicker to dispense. MicroScint™-PS cocktail has an absolute, unquenched Tritium efficiency of approximately 48% when measured in a 24-well white polystyrene OptiPlate microplate.