A Facile and Novel Route to 99mTc-labeled Antimony Sulfide Nanocolloid

99mTc-labeled antimony sulfide nanocolloid was prepared by a new labeling method that involves room temperature reconstitution with Na99mTcO4. Transmission electron microscope showed that the mean particle size was estimated to be mostly 7–15 nm. The labeling yield of 99mTc-Sb2S3 was more than 99%. The stability of the labeled product was studied at room temperature and it was found to be excellent.