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萃取色层法从加速器辐照的镉靶中提取111In

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

    摘要
  • 摘要: 采用质子回旋加速器通过natCd(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 7 mol/L 硝酸将Cd、Cu、Zn穿透，再用3 mol/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2 mg/L。

     

    Abstract: 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 111In3+ 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.

     

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