Die Fokussierungsspektren von 144Ce und 144Pr auf Fig. 5 140La, 144Pr are prepared with radiochemical purities of 99,992%, 99,95% and 98,6% respectively from their parent fission-products : 140Ba and 144Ce. The procedure of ion focusing for this purpose is described. The results are obtained with a separation time of 3 min for 9 O Y and laoLa, or 10 min for 144Pr, with radiochemical yields of over 99%. which offers a new possibility for the production of sources for ,!-therapy. 144Pr is obtained with less than 3 part 144Ce in 5000 parts 144Pr in 15 min.2. Double separation in 6 min leads to with less than 0,Ol pC 9oSr/Curie
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