A new technique for formation of 99mTc-labelled blood leucocytes and platelets.

99mTc -platelets and 99mTc -leucocytes have been formed at neutral pH in presence of gentistic acid using 99mTc pretreated with concentrated hydrochloric acid and vacuum evaporation. High radiochemical purities and specific radioactivities were obtained. The complexes between 99mTc and the blood cells were found remarkably stable, and further studies for nuclear medicine applications are recommended.