Complexity and radioactivity of feed solutions at the Idaho Chemical Processing Plant limit methods used for total uranium. Isotope dilution analysis was investigated as a means of greater reliability with minimum radiation hazard. Remote handling facilities enable purification of small samples to which surface ionization mass spectrometry is particularly adapted. The best ratio of sample to spike is approximately 1 for total uranium. This ratio should be greater than 0.1 for more accurate uranium isotope distribution results. An error component study shows that the error for a single determination at the 95% confidence limits is ±3.7% for total uranium and ±0.13% for the major isotope present. The method offers

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