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A microemulsion comprised of water, Brij 78, pentanol and styrene into which PPO and bis-MSB had been dissolved was prepared. Polymerization of the styrene resulted in a suspension of fluor-containing polystyrene nanoparticles (<100nm). After a concentration step, the aqueous nanosuspension was able to detect 14 C with counting efficiencies over 50% of those of a commercially available...