Radioactive elements and isotopes and compounds; alloys, dispersions incl. cermets, ceramic products and mixtures containing these elements, isotopes or compounds (excl. natural uranium, uranium enriched and depleted in U 235; plutonium, thorium, tritium, actinium-225, actinium-227, californium-253, curium-240, curium-241, curium-242, curium-243, curium-244, einsteinium-253, einsteinium-254, gadolinium-148, polonium-208, polonium-209, polonium-210, radium-223, uranium-230, uranium-232, uranium-233 and artificial isotopes, and their compounds, and alloys, dispersions, ceramic products and mixtures containing these elements or compounds)