Amorphous Carbon Supported Nanoparticles Comprising Oxides of Lanthanides And Method For Preparing Them

The invention is directed to bodies comprising an amorphous carbon particle on which are supported nanoparticles of an oxide of lanthanide. These bodies find use as a pharmaceutical for use in a surgery or therapy and diagnostic methods. The bodies can be made by a process comprising impregnating a carbon source material by contacting it with a solution of a salt of said lanthanide; drying said impregnated carbon source material; and subjecting said dried impregnated material to pyrolysis under inert conditions.