从裂变产物中快速放化分离~(144)La的方法研究
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摘要
为测量短寿命核素~(144) La的衰变数据,需要制备出高丰度、高活度的~(144) La样品。本工作采用"两步延迟分离法"分离流程,以二(2-乙基己基)磷酸酯(HDEHP)萃取为手段,利用SISAK装置在10s内实现~(144 )Ba-~(144 )La的分离,放置20s后再采用P204萃取色层柱提取由~(144 )Ba新生长出来的~(144 )La。通过详细研究萃取时间、萃取剂浓度、介质条件等因素对萃取分配比的影响,确定了从新生裂变产物中快速放化分离~(144) La的流程。流程所需时间约50s,La的化学回收率约为75%。
In order to obtain the decay data of the short-lived nuclide ~(144)La,the ~(144)La samples with high abundance and high activity need to be prepared.In present paper,a separation method was established based on the twice delay separation method,in which the ~(144)Ba-~(144)La was separated in 15sby HDEHP extraction with SISAK separation system,and the newly grown ~(144)La was separated by P204extraction chromatographic column at 20s.The effects of extraction time,concentration of extraction agent and medium condition on the extraction ratio were studied in detail,and the process of rapid radiochemical separation of ~(144)La from the fission products was established.The process takes about 50s,and the chemical recovery rate of ~(144)La is about 75%.
In order to obtain the decay data of the short-lived nuclide ~(144)La,the ~(144)La samples with high abundance and high activity need to be prepared.In present paper,a separation method was established based on the twice delay separation method,in which the ~(144)Ba-~(144)La was separated in 15sby HDEHP extraction with SISAK separation system,and the newly grown ~(144)La was separated by P204extraction chromatographic column at 20s.The effects of extraction time,concentration of extraction agent and medium condition on the extraction ratio were studied in detail,and the process of rapid radiochemical separation of ~(144)La from the fission products was established.The process takes about 50s,and the chemical recovery rate of ~(144)La is about 75%.
引文
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[9]丁有钱,崔安智,杨志红,等.HDEHP萃取法从裂变产物中分离142 La[J].核化学与放射化学,2003,25(4):219-222.
[10]Healy T V.Rapid solvent extraction methods for fission product separation and analysis[J].Radiochim Acta,1963,2(2):52-57.
[2] Ohyoshi A,Ohyoshi E,Tamai T,et al.Short-lived isotopes of lanthanum,cerium,and praseodymium in neutron irradiated uranium[J].J Inorg Nucl Chem,1972,34(11):3293-3302.
[3] Aronsson P O,Skarnemark G,Kvle E,et al.Decay characteristics of some neutron-rich lanthanide nuclides obtained by SISAK technique[J].Inorg Nucl Chem Lett,1974,10(9):753-762.
[4] Skarnemark G,Aronsson P O,Bj9rnstad T,et al.Decay properties of 144-146 La[J].J Inorg Nucl Chem,1977,39(9):1487-1493.
[5] Ikeda Y,Yamamoto H,Kawade K,et al.Decay study of 144 La[J].Tokyo Sugaku Kaisya Zasshi,1979,47(47):1389-1394.
[6]核素图表编制组.核素常用数据表[M].北京:原子能出版社,1977.
[7] Vértes A,Nagy S,Klencsár Z,et al.Handbook of nuclear chemistry[M].US:Springer,2011.
[8]张丕禄.裂变化学[M].北京:原子能出版社,1996.
[9]丁有钱,崔安智,杨志红,等.HDEHP萃取法从裂变产物中分离142 La[J].核化学与放射化学,2003,25(4):219-222.
[10]Healy T V.Rapid solvent extraction methods for fission product separation and analysis[J].Radiochim Acta,1963,2(2):52-57.