A Technetium-99m Labeled Colloid

Abstract

Six-hour Tc99m has been recently(1-3) proposed as a tracer for medical diagnosis. This isotope can easily be “milked” as Tc99mO4, by 0.1 N hydrochloric acid or isotonic sodium chloride solution, from an alumina column containing 67-hr Mo99. Moreover, its single low energy (0.140 MeV) y-ray makes it especially suitable for scintillation scanning.