Thorium oxide and thorium-uranium oxides are "being prepared by the Oak Ridge National Laboratory on a routine basis in 150-lb batches for experimental use. The thorium oxide is formed by the calcination of thorium oxalate precipitated under carefully controlled conditions. Material is produced with mean particle diameters of 1-5 u. Some of the thorium oxide has had uranium added to it by decomposing uranyl carbonate on the thorium oxide followed by calcination. Most of the oxides prepared have been calcined to 1G00°C or more and size classified to remove particles greater than 10 μ.
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