1.用中子法研究蠕墨铸铁[保加利亚]E.W.Peneva 等用对钛、铝特别是稀土元素进行常规的化学分析来研究这些元素对蠕墨铸铁组织的影响,因精确度不高,在很大程度上难以奏效。这便促进了新方法的产生。这种方法的基础是放射性同位素的分析方法,即利用中子激活方法确定这些元素在铁中的精确含量。这种方法已经用于钛和铝分析以及 Ce、La、Nd、Pr 和 Sm 的可测量的分析和这些元素在铸铁的金属相和非金属相内 1. Study of vermicular graphite cast iron with neutron method [Bulgaria] EWPeneva et al. Used conventional chemical analyzes of titanium, aluminum and especially rare earth elements to study the effect of these elements on compacted graphite cast iron because of its low accuracy, To a large extent difficult to work. This has facilitated the emergence of new methods. The basis of this method is the method of radioisotope analysis, which uses neutron activation to determine the exact amount of these elements in iron. This method has been used for the analysis of titanium and aluminum as well as the measurable analysis of Ce, La, Nd, Pr and Sm and the fact that these elements are present in the metallic and non-metallic phases of cast iron