Reillex-Reillex阴离子交换分离克量级铀中微量钚

Separation of Trace Plutonium From Bulk Uranium Using Reillex-Reillex Anion Exchange Chromatography

采用Reillex-Reillex串联阴离子交换色层柱,建立了高铀钚比样品中微量钚的高效分离方法。考察了树脂类型、淋洗条件、价态调节等对钚分离效果的影响,确定了分离流程的条件。当铀钚质量比为106时,经两级Reillex柱分离后,钚的平均回收率为99.35%,铀的去污因子大于107。最后使用该方法从克量级辐照铀靶中分离出了微克量级超纯239 Pu,(^(238)U+^(238)Pu)/^(239)Pu原子比为(3.60±1.15)×10^(-5)(n=6)。

A highly efficient separation method for trace plutonium from high uranium plutonium ratio samples was established by combining two Reillex anion exchange chromatographic columns.The effects of resin type,wash condition,valence state adjustment on plutonium separation were investigated,and the conditions of separation process were determined.When the mass ratio of uranium to plutonium in the feed liquid is 106,after two-stage Reillex column separation,the average yield of plutonium is 99.35%and the decontamination factor of uranium is greater than 107.Using this process,high purity trace ^(239) Pu is separated from irradiated uranium target,and the atomic ratio of(^(238) U+^(238) Pu)/^(239)Pu is(3.60±1.15)×10^(-5)(n=6).