A method of forming an injectable radioactive composition, the method comprising the steps of: (a) depositing a solid form of technetium onto a carbon crucible； (b) preheating the solid form of technetium to remove any carrier； (c) plasma ablating the technetium and portions of the carbon crucible； (d) allowing the carbon and technetium metal to co-condense from the gas phase to produce a nanoparticle composite aerosol in an inert gas； (e) dispersing the nanoparticle composite in water containing a low concentration of surfactant using an electrostatic precipitator； (f) size fractionating the nanoparticle dispersion by filtration with hydrophilic membranes of known pore size.
