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fransiyum-223 beta bozunumu sonucunda radyum-223'e dönüşür (1149 kev bozunma enerjisi), küçük (0,006%) bir alfa bozunumu ile astatin-219'a dönüşür (5,4 mev bozunma enerjisi).
francium-223 then decays into radium-223 by beta decay (1149 kev decay energy), with a minor (0.006%) alpha decay path to astatine-219 (5.4 mev decay energy).