Patent ID: 8247538

Claim:
A method for preparing a radioisotope-labeled compound using a carbon nanotube, comprising (1) agitating a carbon nanotube with a radioisotope to prepare a carbon nanotube filled with a radioisotope containing an unreacted radioisotope; (2) washing the carbon nanotube filled with a radioisotope containing an unreacted radioisotope obtained from step (1) with water to prepare the carbon nanotube filled with a radioisotope; and (3) mixing the carbon nanotube filled with a radioisotope obtained from step (2) and a compound in the presence of a reducing agent to prepare a radioisotope-labeled compound, wherein the compound is a physiologically active material selected from the group consisting of 2,6-diisopropylacetanilidoiminodiacetic acid and iodobenzylguanidine.