noted. Figure 2 shows marked deviation from linearity in the 5-60 ppm range. Uranium concentrations greater than 70 ppm produced decreasing fluorescence intensity readings. Instrument response was linear for uranium, concentrations less than 2.5 ppm. Values greater than 2.5 ppm showed deviations from linearity, indicating that 2.5 ppm uranium is an upper limit to linear response. Solutions with uranium concentrations in the upper ranges of this study would normally require dilution into a linear range to remain on-scale.Seven synthetic samples, ranging in concentration from 7.3
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