Abstract
The non-destructive determination of uranium, by measurement of the 184-KeV gamma ray activity arising from the decay of uranium-235, has been extended to the continuous monitoring of impure plant solutions. Interference in the gamma spectrometric measurement at 184 KeV by the radioactive decay products of uranium is eliminated by means of an error signal. Measurement of the decay product gamma activity at higher energies is used to produce a signal which is injected, suitably proportioned and phased, into the measurement channel. An instrument is described which is suitable for the monitoring of uranium streams containing 5–30 % w/v of natural uranium. Gross changes in the acidity and in the impurity content of the uranium stream have no appreciable effect on the indicated uranium concentration.
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