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为精确测量142 La的衰变数据,需制备出高活度、高丰度、无载体的142 La样品。为去除或降低混合裂片中放射性镧的其他同位素,依据母子体衰变关系和同一质量链上独立产额的差异,提出了“三步分离”的分离模式。以一次BaCl2·2H2O沉淀、两次HDEHP萃取色层分离为手段建立了快速分离142 La的化学流程,并研制了批式快速化学分离装置。流程耗时约20min,化学回收率约80%,对其他核素的去污因数大于103,产品中142 La与141 La活度比大于3.5。
In order to accurately measure the decay data of 142 La, a high activity, high abundance, carrier-free 142 La sample was prepared. In order to remove or reduce other isotopes of radioactive lanthanum in the hybrid slides, a separation pattern of “three-step separation” was proposed based on the decay relationship between mother and son and the independent yield on the same quality chain. The chemical process of rapid separation of 142 La was established by means of one precipitation of BaCl2 · 2H2O and the separation of two HDEHP layers by chromatography. A batch chemical fast separation device was developed. The process takes about 20 minutes, the chemical recovery rate is about 80%, the decontamination factor for other nuclides is greater than 103, and the activity ratio of 142 La and 141 La in the product is greater than 3.5.