Authors: A. Dyer 1 and J. Dean 1
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  • 1 University of Salford Department of Chemistry and Applied Chemistry M5 4WT Salford (England)
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Emulsion counting, more correctly known as colloid counting, is the most widely practised technique for the radioassay of aqueous sample types by the liquid scintillation technique. The double ratio technique can be used to determine whether or not radioactivity is being counted with true solution efficiency, and was applied to a range of systems consisting of deionised water, Triton X-100 and toluene (containing3H-water,3H-toluene or14C-toluene). Some hypotheses were developed in an attempt to explain the double ratio values obtained for the various systems studied.