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核素~(228)Th是~(232)U的衰变产物,也是~(232)Th衰变的第三代子体。~(232)U存在于经反应堆辐照过的核燃料里,从这种核燃料里分离~(228)Th较为困难。由天然钍中直接分离出~(228)Th也是困难的。为此,我们采用间接的方法。据~(232)Th的衰变链:
~ (228) Th is a decay product of ~ (232) U and a third daughter of ~ (232) Th decay. ~ (232) U is present in reactor-irradiated nuclear fuel and it is difficult to separate 228 Th from such nuclear fuel. The direct separation of ~ (228) Th from natural thorium is also difficult. To this end, we use indirect methods. According to ~ (232) Th decay chain: