Adsorption behavior of molybdate on acidic alumina was studied at boiling water bath temperature (~100 °C). Various parameters
affecting the adsorption of molybdenum, such as pH, amount of molybdenum, incubation period, etc., were determined. A 99mTc generator was prepared by adsorbing low specific activity 99Mo (150 mg) on 1 g alumina. Elutions were carried out with saline. Performance of the generator such as 99Mo breakthrough, aluminum contents, pH, elution profile, radiochemical purity, and labeling efficiency of kits were checked.