Abstract
Plutonium in uranium-plutonium -manganes e alloys is determined using an x-ray absorption edge method in which the intensities of the secondary x-rays of niobium and molybdenum transmitted through the sample solution are measured. These secondary x-rays are generated by irradiating a niobium-molybdenum metal target with x-rays from a tungstentarget x-ray tube and are transmitted through an absorption cell filled successively with water, suitable standards, and the sample solution. The L III absorption edge for plutonium at O. 686 A. occurs between the K(3 line for niobium and the I@ line for molybdenum at O. 666 and O.710 A.: respectively. Measured transmitted intensities of these lines are related to plutonium concentrations using accepted absorption principles. The method is applicable to the determination of plutonium concentrations in the range between 30 and 100% with relative standard deviations in the range between O.91 and O. 5570. Only radon, radium, neptunium, and americium have absorption edges between the x-ray lines used for analysis and cause interference.
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