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Based on neutron activated  99 Mo, a procedure for preparation of  99 Mo/ 99m Tc radioisotope generator was developed. Batch equilibration method was used to investigate the sorption behavior of Mo (VI) (10 −4  M) in chloride and nitrate solutions on cerium (IV) molybdate gel matrix using  99 Mo radiotracer. The breakthrough sorption capacity of cerium molybdate gel matrix for  99 Mo (VI) (3×10 −2  M) were found to be 0.54 mmol/g of the sorbent [1 g column (0.6 cm i.d.)]. Elution performance of the generated  99m Tc from cerium molybdate- 99 Mo chromatographic column was investigated as a function of inside diameter of the column, amount of the bed matrix and flow rate of the eluent. Based on the obtained results,  99 Mo/ 99m Tc radioisotope generator was prepared based on adsorption of neutron activated  99 Mo (VI) of low specific activity onto chromatographic columns packed with 5 g cerium molybdate gel matrix. The radioactivity of  99m Tc is periodically eluted with 10 mL 0.9% NaCl solution at a flow rate of 1 mL/min. Elution yield of 78±5% was obtained with high chemical, radionuclidic ( 99 Mo breakthrough 1×10 −3 ±0.3×10 −3 %) and radiochemical purity (97±2%).

99 Mo/ 99m Tc radioisotope generator based on adsorption of 99 Mo (VI) on cerium (IV) molybdate column matrix