Improvement of a radiochemical separation for selenium 79: Applications to effluents and nuclear wastes.
Improvement of a radiochemical separation for selenium 79: Applications to effluents and nuclear wastes.
复制标题
DOI：
10.1016/j.talanta.2007.01.011
复制
发表时间：
2007-05
期刊：
影响因子：
6.1
通讯作者：
C. Fréchou;Sandrine Aguerre;J. Degros;G. Kerlau;T. Grangeon
中科院分区：
文献类型：
--
作者：
C. Fréchou;Sandrine Aguerre;J. Degros;G. Kerlau;T. Grangeon
硒79是由235U裂变产生的β放射性核素，是核废物处置中感兴趣的长半衰期放射性核素之一，因为其潜在的迁移能力到地表环境。由于79 Se在废物基质中的放射性很低（约10− 3 Bqg −1），因此测量79 Se特别困难。基于离子交换分离的放射化学方法已在先前的论文中描述。这项工作提出了不同的应用程序的放射化学分离废物样品和改进的这一程序，包括选择性提取的硒作为二乙基硒在有机溶剂中，然后在水介质中的再提取。这个额外的步骤允许去污因子增加，目的是通过液体闪烁计数来计数79 Se。
Selenium 79 is a beta emitter produced from235U fission and is one of the long half-life radionuclides of interest in nuclear waste disposal problematic because of its potential migration capacity to the surface environment. Measurement of79Se is particularly difficult due to its low activity in waste matrices (about 10−3Bqg−1). A radiochemical procedure based on ion exchange separations was already described in a previous paper. This work presents different applications of the radiochemical separation to waste samples and an improvement of this procedure, including a selective extraction of selenium as diethylselenium in an organic solvent followed by a re-extraction in aqueous medium. This additional step allows the decontamination factor to be increased with the aim of counting79Se by liquid scintillation counting.