Determination of Uranium in (NH₄)₃UO₂(CO₃)₃ and U₃O₈ by using of alpha-spectrometry and ICP-MS

A method is described for determination of uranium content and impurities in (NH₄) UO₂(CO₃)₃ (AUC) and produced after heating U₃O₈.The trace metals are determined after solvent extraction for removing the great amount of uranium and measured with quadrupole ICP-MS. The content of uranium in AUC is determined after dissolution, dilution and filtration and measured by using of alpha-spectrometry and parallel measurement by ICP-MS. The U₃O₈ was produced after 36 hours of heating at 750°C. After that it was dissolute in strong hot acid and diluted in ultra-pure water for ICP-MS measurement. It was measured standard raw material from natural uranium for confirmation of mass/activity connection. The samples was measured with alpha-spectrometer for determination of real activity of uranium isotope ²³⁸U and comparison between ICP-MS calculated activity and real measured activity with alpha spectrometry. Key words: AUC, ICP-MS, Uranium, α-spectrometry, U₃O₃