溶剂萃取联合离子交换法分析气载流出物中铀同位素含量及比值

Analysis of Uranium Isotope Content and Ratio in Gaseous Effluents by Solvent Extraction Combined with Ion Exchange

为解决气载流出物分析存在的干扰元素去除问题,设计了一种铀同位素的分析流程:样品加入实时产额示踪剂232U后进行灰化,采用盐酸溶解灰分,进一步借助溶剂萃取法和离子交换法的联合应用实现对主要干扰元素铁的去污,铀的解吸溶液电镀制源并利用α谱仪进行测量,计算得到样品中铀同位素的结果。实际样品验证结果表明:该流程的放化回收率介于81. 7%~107%,235U/238U介于0. 78%~1. 13%,整体略高于正常环境水平,主要是受铀产品丰度的影响。该方法具有较高的准确度和精密度,能够满足气载流出物中铀同位素常规检测需求。

In order to solve the problem of removing interference elements in the analysis of airborne effluents,a flow chart of uranium isotopes analysis was designed:the sample was ashed after adding 232 U real-time yield tracer and then dissolved by hydrochloric acid.Main interfering element iron was decontaminated by the combined application of solvent extraction method and ion exchange method,the uranium desorption solution was electroplated and the a-spectrometer was used to detect.The results of uranium isotopes in the samples were calculated.Actual sample verification results showed that the radiochemical recovery were 81.7%〜107%,and ^(235)U/^(238)U were between 0.78%~1.13%which were slighdy higher than the normal environmental levels,mainly due to the influence of uranium product abundance.The method has high accuracy and precision,and could meet the needs of routine detection of uranium isotopes in airborne effluents.