Preparation of radiochemically pure radionuclides145Sm,152+154Eu and169Yb

The separation of radioactive impurities from the original radioactive material allows to achieve a higher precision of nuclear characteristic measurements of radioactive standards. The different ability of lanthanoides to form amalgams has been used for the separation of¹⁴⁵Sm,^152+154Eu and¹⁶⁹Yb from radioactive impurities. The optimum conditions for electrolysis on mercury electrode followed by the sorption on cellulose powder used for the preparation of weightless standards have been described.