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稀土元素外层电子排布的相似性,使依据电子结构变化来测定元素丰度的化学分析方法遇到了系统困难,但对依据核性质的中子活化分析,却不存在这种困难。尽管近年来,电感耦合等离子发射光谱(ICP)和同位素稀释质谱有了长足的进步,但中子活化分析仍是地质样品中稀土元素分析的重要方法之一。在某些情况下,甚至是唯一适用的方法。稀土元素(从La到
The similarity of the electronic arrangement of rare earth elements in outer layers has made it difficult for chemical analysis methods to determine elemental abundances based on changes in electronic structure, but there is no such difficulty with neutron activation analysis based on nuclear properties. Although ICP and isotope dilution mass spectrometry have made great strides in recent years, neutron activation analysis is still one of the important methods for the analysis of rare earth elements in geological samples. In some cases, it’s even the only one that works. Rare earth elements (from La to