""Nuclear Science Series'' of the National Research Council. Committee on Nuclear Science. The radiochemistry of technetium is discussed. The properties of metallic technetium, solution chemistry, volatilization methods, extraction into organic solvents, chromatographic behavior and electrochemical behavior of technetium are outlined. The dissolution of samples containing compounds of technetium is described. Counting techniques for use with isotopes of technetium are reviewed. A collection of 17 detailed radiochemical procedures for the determination and separation of technetium is given. (M.C,G.)