大量铀中微量镎的快速自动化分离技术

Rapid Automatic Separation Technology of Trace Np With Presence of Large Quantity of Uranium

摘要: 进行了大量铀中微量镎的快速自动化分离技术研究。基于液闪测量的要求，建立了α-噻吩甲酰基三氟丙酮（TTA）萃取及阴离子交换树脂纯化的分离流程，并对流程进行了检验，镎的回收率在90%以上，对铀、钚及干扰的裂变产物的去污因子均在1.0×10⁴以上。基于该流程，设计了自动定量取样装置、自动萃取装置、自动柱分离装置，实现了全分离流程的自动化。全分离流程自动分离时间在1.9 h左右，对铀的去污因子在1.0×10⁴以上，对镎的回收率达到(71.7±2.8)%(n=5)。

Abstract: Rapid automatic separation of trace amount of neptunium with the presence of large quantity of uranium was studied. A chemical procedure using TTA extraction and anion-exchange was established. The decontamination factors are above 10⁴ for both uranium and plutonium with respect to neptunium. Simultaneously, the recovery of neptunium is above 90%. Based on the chemical separation procedure, an automatic separation device was developed with the functions of quantitative sampling, extraction and automatic chromatographic separation. The whole automatic separation takes 1.9 h and the recovery of neptunium is (71.7±2.8)%(n=5).