摘要
一、引言^(231)Pa是AcU(^(235)U)天然放射系的一个重要成员。在海洋地球化学和地质年代学研究中,它是一个非常重要的核素。但可作为^(231)Pa分离用的产额示踪剂的核素只有^(233)Pa,它是β-γ发射体,半衰期短(27.0 d)。因此如果能够简便地制得示踪剂^(233)Pa,对^(231)Pa年代学的研究和应用以及对镤化学和放射化学的研究无疑是个促进。
A new method is presented for high purity ^(233)Pa separation from ^(237)Np usingTTA (2-thenoyltrifluoroacetone) as extractant. ^(233)Pa is extracted with an equalvolume of TTA in benzene from 8 mol/1 HNO_3 solution containing ^(237)Np, thenwashed the organic phase with 8 mol/1 HNO_3 three times. Subsequently, ^(233)Pa isreexacted into an equal volume of 1 mol/1 HNO_3-0.1 mol/1 HF from organicphase. The aqueous phase is washed by 0.5 mol/1 TTA in benzene. After all HFis removed by evaparation, and the residue was dissloved in 8 mol/1 HNO_3, theabove procedure is repeated once again. The purity of ^(233)Pa obtained by this method is high enough for study in geochronology of uranium series isotopes.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
1990年第3期69-72,共4页
Atomic Energy Science and Technology
