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UF_6为重要核材料,准确测定UF_6中痕量杂质元素对指导工艺生产,保证产品质量具有重要意义。由于铀在堆中子辐照过程中产生~(239)Np和一系列裂变产物,因此必须用前处理方法除去铀基体,使残余铀产生的~(239)Np和裂变产物不再影响铀基材料中痕量元素的中子活化分析。杂质元素含量越低,对这种分离要求就越高。 本文提出了化学组分离-中子活化分析法测定UF_6水解液中痕量元素分析流程。把UF_6水解液去F~-转化为5.5N HNO_3介质,使其两次通过80％TBP-KelF色层柱(φ7×140mm和φ3×60mm)预分离除去铀。痕
UF_6 is an important nuclear material. The accurate determination of trace impurity elements in UF_6 is of great significance to guide the production process and ensure the product quality. As uranium produces ~ (239) Np and a series of fission products during heap neutron irradiation, the uranium matrix must be removed by pretreatment so that ~ (239) Np and fission products produced by residual uranium will no longer affect uranium groups Neutron Activation Analysis of Trace Elements in Materials. The lower the impurity element content, the higher the requirement for such separation. In this paper, a chemical composition separation - neutron activation analysis method for the determination of trace elements in UF_6 hydrolyzate analytical procedures. UF_6 hydrolyzate to F ~ - converted to 5.5N HNO_3 medium, which twice through 80% TBP-KelF chromatography column (φ7 × 140mm and φ3 × 60mm) pre-separation of uranium. mark