Patent ID: 8778300

Claim:
A method of forming an injectable radioactive composition, the method comprising the steps of: (a) depositing a solid form of a radioactive isotope and carrier onto a carbon crucible; (b) preheating the solid form of radioactive isotope and carrier to selectively remove the carrier without removal of the radioactive isotope; wherein said preheating is at a preheating temperature in the range of about 1200 to about 1800 degrees Celsius for about 5 to 25 seconds; and wherein said preheating has a rise time from ambient to said preheating temperature of about 0.1 to about 5 seconds; (c) plasma ablating the radioactive isotope and portions of the carbon crucible, thereby forming radioactive particles; (d) precipitating the ablated radioactive particles in a sonicating electrostatic precipitator; (e) maintaining the precipitated radioactive particles in an aqueous dispersion; and, (f) size fractionating the precipitated radioactive particles using filtration through hydrophilic membranes of a known pore size; thereby forming an injectable radioactive composition.