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Preparation of a 100-kilogram Sample of Uranium Oxide for IAEA.

出版	1965
URL	http://books.google.com.hk/books?id=oID4jgEACAAJ&hl=&source=gbs_api

註釋A batch of uranyl nitrate was spiked and precipitated with ammonia gas to form an ammonium diuranate (ADU). The ADU was filtered off, washed, and dried. The ADU was fed into a reduction kiln and reduced to uranium dioxide in a hydrogen atmosphere. The uranium dioxide was stabilized in a carbon dioxide atmosphere, fed through a micropulverizer, and then blended in a double-cone blender for 1 hour. The product was analysed spectrographically and it was found to have a boron and cadmium content lower than that specified. A micropulverized batch containing some boron and cadmium was then intermixed with this product in the double-cone blender to increase the amount of each of these elements present. The blended product was then unloaded directly into plastic bottles, each of which holds about 10 kilograms. One random sample from each bottle was analysed spectrographically. It seems that the boron is still not present, but from the analysis of the two separate batches before intermixing, approximately 0.4 ppm can be expected. The cadmium figure based on the same two analyses should be about 0.2 ppm. The total weight of uranium oxide dispatched was 220 pounds.