Abstract
Magnesium-38% thorium alloy was irradiated with thermal neutrons to a total dose of 8 to 9 x 10/sup 15/ nvt and then charged into tantalum crucibles with uranium or U-5.2% Cr; the crucibles were sealed and heated in an oscillatiug furnace, then cooled. The resulting ingots were sectioned horizontally and the sections analyzed for the 90-kev gamma ray from Pa/sup 233/ formed by irradiated thorium as a precursor to U/sup 233/. The data showed little activity in the Mg-Th phase and high activity in the interface, ingot surface turnings, and the uranium or U- Cr phase, indicating that>99% of protactinium will follow the uranium-rich phase in the extraction of thorium from uranium with magnesium. (D.L.C.)
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