硝酸体系中DGA树脂分离镅与锔

Separation of Americium From Curium in Nitric Acid on DGA Resin

三价镅(Am)与锔(Cm)的相互分离对于α能谱和质谱准确测量镅锔同位素具有重要意义,但它们的化学性质相近,相互分离非常困难。本工作研究了硝酸体系中DGA树脂对Am(Ⅲ)和Cm(Ⅲ)的静态吸附性能和柱分离行为,获得了不同酸度和温度条件下的容量因子(k′)及分离因子(SF)数据,以及不同柱高(L)、线速率(v)条件下的峰分辨率(R)、理论塔板高度(H)等参数。根据色谱理论指导柱分离条件的选择和优化,获得了较好的分离效果:Am与Cm回收率在90%以上时,相互间去污因子达1×102以上。

It’s very important of the mutual separation of americium and curium for the accurate measurement of their isotopes by alpha spectrometry and mass spectrometry.However,it is a great challenge to separate Am(Ⅲ)and Cm(Ⅲ)because of their similar chemical properties.This paper made a research on the static adsorption properties and column separation of americium and curium on DGA resin with nitric acid.First of all,the adsorption capacity factor(k′)and separation factor(SF)in different acidities and temperatures were obtained.Next,the parameters such as the peak resolution(R),the theoretical plate height(H)and so on with different column heights and linear flow rates were studied.Based on the chromatographic theories,good separation results that decontamination factors are over 1×102 for both americium and curium when the yields are above 90%have been achieved under the optimal column separation conditions.