萃取色层法从加速器辐照的镉靶中提取^(111)In

Separation of ^(111)In From Cyclotron Irradiated Cd Target with Extraction Chromatographic Method

采用质子回旋加速器通过nat Cd(p,xn)111In核反应制备111In。为实现从加速器辐照的天然Cd靶中提取111In,建立使用二(2-乙基己基)磷酸萃淋树脂(CL-D2EHPA,75～120目)色层柱法从Cd靶溶解液中提取111In的工艺。根据In3+、Fe3+、Cu2+、Zn2+和Cd2+在盐酸或硝酸体系与50%的CL-D2EHPA之间的分配系数,确定了使用CL-D2EHPA色层柱从天然Cd靶和靶内含有杂质核素中提取111In的工艺:首先用7mol/L硝酸将Cd、Cu、Zn穿透,再用3mol/L盐酸解吸111In并收集。111In的放化回收率大于96%,用天然Cd靶制备的111In核纯度大于96%,化学杂质小于2mg/L。

111In was produced by the nuclear reaction of natCd（p,xn）111In.In order to separate 111In from Cyclotron irradiated natural Cd target,a radiochemical purification procedure of CL-D2EHPA extraction chromatography method was developed.Based on the distribution coefficients（Kd） of In3＋,Fe3＋,Cu2＋,Zn2＋ and Cd2＋ between Di-（2-ethylhexyl） phosphate resin and hydrochloric acid or nitric acid medium,the separation of 111In from natural Cd and other nuclides using CL-D2EHPA resin column and different concentrations of HNO3 and HCl as the eluants had been studied.The Cd、Cu、Zn fractions were eluted by 7 mol/L HNO3,111In fraction was washed out and collected in 3 mol/L HCl.The recovery yield of 111In 3＋ was over 96%.The radionuclidic purity of 111In produced by natural Cd was more than 96%,The total chemical impurity was less than 2 mg/L.