نبذة مختصرة : Thin natEr2O3 targets were irradiated on cyclotron by 60 MeV alpha particles. Thulium and ytterbium radioisotopes, formed during irradiation, were separated from the target material and the one from another by extraction chromatography using Ln Resin in nitric solution. 165Er, formed mainly by the decay chain 165Yb → 165Tm → 165Er, was isolated after ingrowth in the thulium fraction by an additional extraction chromatography step using the same sorbent. Recovery of thulium and ytterbium radioisotopes was > 90%.
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