地核中没有放射性,这是人们长期以来所持的观点。原因是地幔中的主要放射性元素(钾和铀)呈象硅酸盐及氧化物等的厌铁化合物存在,因此,人们认为放射性元素与金属核是不可混合的。然而,钢和二氧化铀二元体系的实验测定表明,在3120K以上,该体系为二元液相,其中一相富二氧化铀,另一相贫二氧化 There is no radioactivity in the core, which is what people have long held. The reason is that the major radioactive elements in the mantle (potassium and uranium) are present as anaerobic compounds such as silicates and oxides, and therefore radioactive elements are considered to be incompatible with the metal core. However, the experimental determination of binary systems of steel and uranium dioxide shows that the system is a binary liquid phase above 3120K, in which one phase is rich in uranium dioxide and the other is lean in dioxide