[en] Anion-exchange chromatography of the rare earth (Sm, Nd, Pr, Ce) ions in methanol-nitric acid-water media is performed using high-pressure liquid chromatography. The separation method is especially designed for determination of ¹⁴⁸Nd in nuclear fuel cycle in order to find precise burn-up values. While commonly used for rare earth separation at low pressure and hence low flow rate, this separation system has not been described using HPLC. The samples injected on the column contain typically 10 nmole of the nitrates of Sm, Nd, Pr and Ce. Furthermore, some experiments with a large excess of uranyl nitrate were carried out in order to simulate the conditions in solutions of irradiated nuclear fuel. After equilibration of the column to the desired elution composition, 20-25xμl of sample was injected. The sample concentration was typically 4x10^-4 M for the ions of Sm, Pr, Nd and Ce. In the separations with added uranyl nitrate, the uranium concentrations were varied 1-125 times the concentrations of the individual rare earths. By adjusting the pressure between 300 and 600 psi, the flow rate was kept in the range 0.5-1.0 cm³/min. As no changes in the separation were observed as a result of this variation, 1.0 cm³/min was used throughout. The high-pressure liquid chromatography method presented here is very fast, gives high resolutions, and enables collection of selected fractions containing nmoles of rare earth by UV monitoring at 280 nm of the eluate. (T.G.)