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A procedure has been developed for the determination of moisture in an organic material by the thermalization of neutrons. The method developed utilized commercially available equipment designed for depth moisture determinations of soils. The moisture content of three series (replications) of water in lactose U.S.P. was determined at various concentration levels by the neutron method and by two official methods (gravimetric and Karl Fischer titration). The number of thermal neutrons produced at the various moisture concentrations prepared were plotted against the corresponding moisture content indicated by each of the two official moisture determination methods. Regression curves were prepared using least squares calculations. With t tests it was shown that the means of the slopes of the three series were estimates of the true slope of the regression curves, and 0.95 confidence limits were also set on the slopes. The applicability of this new method of determining the moisture content of pharmaceutical systems is discussed.
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