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The radioactive concentrations of  99m Tc/ 188 Re from their generators are dependent upon the specific activity of  99 Mo/ 188 W, which dictates the bed size of the alumina/gel column and the volume of physiological saline needed as eluent. Because of the high content of inactive molybdenum/tungsten in neutron irradiated MoO 3 /WO 3 , large columns containing alumina/gel are needed to produce chromatographic  99 Mo →  99m Tc/ 188 W →  188 Re generators. This results in large elution volumes containing relatively high  99 Mo/ 188 W contents and low concentrations of  99m Tc/ 188 Re. The decrease in radioactive concentration, or specific volume, places a limitation on some of the clinical procedures. We report post elution concentration of  99m Tc/ 188 Re using in house prepared silver cation exchange and alumina column. The high bolus volumes (10 − 60 ml saline) can conveniently be concentrated in 1 ml of saline. This approach also works very effectively to yield high specific volume solutions of  99m Tc-pertechnetate from a fission  99 Mo loaded alumina generator towards the end of its normal working life.

Concentration of 99m Tc-pertechnetate and 188 Re-perrhenate