Chavan Vivek, Agarwal Chhavi, Pandey A K
Radiochemistry Division, Bhabha Atomic Research Centre (BARC) , Trombay, Mumbai 400085, India.
Anal Chem. 2016 Apr 5;88(7):3796-803. doi: 10.1021/acs.analchem.5b04827. Epub 2016 Mar 11.
Pore-filled membranes with scintillating properties have been synthesized for sensing α-emitting radionuclides. The membranes have been prepared by in situ UV-initiator-induced polymerization of monomer bis[2-(methacryloxy)ethyl] phosphate in pores of the host membranes, poly(propylene) and poly(ethersulfone). The polymerization has been carried out in the presence of scintillating molecules, 2,5-diphenyloxazole. These scintillating molecules are physically trapped in the thus formed microgel in the membrane. Much higher α-scintillation efficiency has been obtained for the (241)Am-loaded poly(ethersulfone)-based grafted membrane compared to poly(propylene)-based membrane. This was attributed to the aromatic backbone of the poly(ethersulfone) membrane. The scintillation response of poly(ethersulfone)-based membranes has been found to be linear over the range of (241)Am activity studied. The pore-filled scintillating membranes have been found to be selective toward Pu(4+) ions at higher HNO3 concentration compared to Am(3+). The analytical performance of the pore-filled scintillating membranes has been evaluated. The membranes have been found to be stable and reusable. The scintillating membrane with optimized composition has been applied for quantification of Pu in a soil sample.
已合成出具有闪烁特性的填充孔膜，用于检测发射α粒子的放射性核素。这些膜是通过在主体膜（聚丙烯和聚醚砜）的孔中原位紫外引发剂引发磷酸双[2-(甲基丙烯酰氧基)乙基]酯单体聚合制备的。聚合反应在闪烁分子2,5-二苯基恶唑存在下进行。这些闪烁分子物理捕获在膜中由此形成的微凝胶中。与基于聚丙烯的膜相比，负载有（241）Am的基于聚醚砜的接枝膜获得了更高的α闪烁效率。这归因于聚醚砜膜的芳香主链。已发现基于聚醚砜的膜的闪烁响应在所研究的（241）Am活度范围内呈线性。已发现填充孔的闪烁膜在较高硝酸浓度下对Pu(4+)离子的选择性高于Am(3+)。已评估了填充孔的闪烁膜的分析性能。已发现这些膜稳定且可重复使用。具有优化组成的闪烁膜已应用于土壤样品中Pu的定量分析。
