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The production of non-commercially available  135 La by proton irradiation of an isotopically enriched [ 135 Ba]BaCO 3  target at a cyclotron is described. The purification of the radionuclide was performed by a La-selective resin.  135 La was separated in no-carrier-added (n.c.a) form in a nitric acid solution with a radiochemical yield of 83 ± 5% and a total activity per batch of 43 ± 3 MBq. The enriched [ 135 Ba]Ba was recycled to the carbonate form with a recovery of 90 ± 3%. On the basis of a detection limit of 1 Bq/mL, solutions of n.c.a.  135 La could be measured down to the 10  – 15  mol/L concentration range.

Production of no-carrier-added 135 La at an 18 MeV cyclotron and its purification for investigations at a concentration range down to 10 −15 mol/L

Production of no-carrier-added 135 La at an 18 MeV cyclotron and its purification for investigations at a concentration range down to 10 −15  mol/L