Abstract: Uniform microspheres substantially or completely free from internal cavities and voids are prepared by spraying an aqueous hydrated metal oxide solution onto the surface of a water-immiscible organic liquid containing from 0.04 to 2.0 percent by volume of a surface active agent, the viscosities of each of the organic and inorganic phases plus the amount of surface active agent within the above range being selected such that there is sufficient surface active agent present to prevent the globules from adhering to each other yet an insufficient amount to prevent deformation from the substantially spherical shape.

Abstract: The invention relates to a method for the preparation of aniondeficient actinide nitrate solutions. Anion deficient actinide nitrate solutions are used for the preparation of ceramic spherical ceramic nuclear fuel.According to the invention one or more actinide oxides selected from the group of PuO.sub.2, UO.sub.2, U.sub.3 O.sub.8, UO.sub.3 of oxides ranging between UO.sub.2 and UO.sub.3 are dissolved in one or more actinide nitrates which are molten in their water of crystallination. The obtained mixture is subsequently diluted with water.