The measurement of uranium and plutonium using isotope excited K-shell X-ray fluorescence

The technique of isotope excited X-ray fluorescence has been used to measure plutonium and uranium concentrations in mixed solutions. A wide range of U/Pu concentrations and ratios were studied to give information on mutual interactions. A multiple regression on the intensity data using the stepwise procedure (as far as the intensity squared terms) has given equations relating intensities to uranium and plutonium concentrations. Only statistically significant terms were retained in the model. The terms in the equations can be associated with self-absorption and enhancement effects. (author)