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Because of the high content of inactive molybdenum in neutron irradiated MoO 3 , large columns containing alumina or gel are needed to produce chromatographic  99 Mo→ 99m Tc generator. This results in large elution volumes containing relatively high  99 Mo breakthrough and low concentrations of  99m TcO 4  - . The decrease in specific volume of  99m Tc places a limitation on reconstitution of some kits for  99m Tc radiopharmaceuticals applied in diagnostic nuclear medicine. Hence concentration technique is mandatory for effective utilization of ( n ,γ) produced  99 Mo/ 99m Tc generators at the start of its life whereas in case of fission  99 Mo/ 99m Tc generator the technique may be quite useful at the end of first week of its life. We report post elution concentration of  99m Tc using in house prepared Pb column. The high bolus volumes (10–60 ml saline) can conveniently be concentrated in ∼1 ml of saline.

Lead (Pb) column for concentration of 99m Tc-pertechnetate