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Terbium-161 ( 161 Tb) is a potential radiolanthanide due to its favorable properties for treatment small size of cancer. Preliminary study on radiochemical separation of 161 Tb from Gd/Tb matrix using Ln resin column based on extraction chromatography method has been carried out. 161 Tb radionuclide was produced by irradiation of natural Gd 2 O 3 target through neutron thermal bombardment at G.A. Siwabessy Multipurpose Reactor. Fractions eluted from the column containing Gd/Tb matrix of irradiated natural Gd 2 O 3 target were identified and quantified using a γ-rays spectrometer with HP-Ge detector coupled to a multichannel analyzer. The results show that the optimum condition on 161 Tb separation from irradiated Gd 2 O 3 target with radionuclide purity 99.27 ± 0.30% was obtained using HNO 3 solution with concentration of 0.8 and 3 N to separate gadolinium and terbium isotope, respectively. The yield of 161 Tb obtained from the separation was 61.21 ± 2.05% and Gd recovered was 97.15 ± 2.23%. Based on this experiment, 161 Tb has been separated from irradiated natural gadolinium oxide target with high radionuclide purity.

Radiochemical Separation of <sup>161</sup>Tb from Gd/Tb Matrix Using Ln Resin Column