New Fluorescence Photometer

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Abstract
An instrument for microanalytical analysis by a fluorescence method which is sensitive, linear, and stable is described. Both an unknown and a reference sample of the same constitution are excited to fluorescence by ultraviolet light emitted in pulses by an ac powered mercury arc lamp. The resulting pulsed fluorescent light from each sample is incident on a separate vacuum phototube. The ratio of the fundamental ac components of the photoelectric currents flowing in the two phototubes is measured automatically by a servo‐mechanism. In such a system, the measurement is independent of the intensity of the exciting ultraviolet light, the thermionic currents of the two phototubes, and the temperature of the fluorescent samples. A simplified optical system provides good efficiency. Either solid or liquid samples may be rapidly measured. For uranium analysis the instrument may be calibrated to read full scale for 5·10−10, 5·10−9, 5·10−8, and 5·10−7 gram of uranium. Although it is designed primarily for uranium analysis, the filters may be changed to permit measurement of other materials which can be analyzed by fluorescence methods.

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