裂变产物中~(90)Rb的快速放化分离方法研究
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摘要
为精确测量~(90)Rb的衰变数据,需制备出放化纯的~(90)Rb样品。本文利用"两步延迟分离法",建立了一套从新生成的裂变产物中快速分离高丰度~(90)Rb的放化流程。该流程先采用抽气法从辐照靶内提取出气体裂变产物90 Kr,再利用水洗法提取出90 Kr衰变生成的子体~(90)Rb。研制了一套90 Kr快速提取装置,最终得到了无载体、高比活度的~(90)Rb样品。整个分离流程收率约为20%,对主要杂质核素的去污因子达到了103,操作时间在2.5min内。
In order to get the decay data of ~(90)Rb measured more accurately,a sample of~(90)Rb of radiochemical purity has to be prepared.A separation method was established based on twice delay separation method,in which the high isotope abundance can be extracted from new produced fission product.First of all,the gaseous fission product90 Kr was extracted from the irradiated target by a deflation procedure,and then through a washing procedure,the ~(90)Rb generated by 90 Kr decay was collected.A system for rapid extracting 90 Kr was also developed.Finally,a carrier-free ~(90)Rb product of high specific activity was obtained.The total recovery of ~(90)Rb is about 20%.The decontamination factor of the main impurities is about 103.The whole procedure costs in 2.5min.
In order to get the decay data of ~(90)Rb measured more accurately,a sample of~(90)Rb of radiochemical purity has to be prepared.A separation method was established based on twice delay separation method,in which the high isotope abundance can be extracted from new produced fission product.First of all,the gaseous fission product90 Kr was extracted from the irradiated target by a deflation procedure,and then through a washing procedure,the ~(90)Rb generated by 90 Kr decay was collected.A system for rapid extracting 90 Kr was also developed.Finally,a carrier-free ~(90)Rb product of high specific activity was obtained.The total recovery of ~(90)Rb is about 20%.The decontamination factor of the main impurities is about 103.The whole procedure costs in 2.5min.
引文
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[2]AMAREL I,BERNAS R,FOUCHER R,et al.Half life determination of some short-lived isotopes of Rb,Sr,Cs,Ba,La and identification of93,94,95,96 Rb as delayed neutron precursors by online mass-spectrometry[J].Physics Letters B,1967,24(8):402-404.
[3]HUANG H,PATHAK B P,IAFIGLIOLA R,et al.Decay of 90m,gRb[J].Zeitschrift Für Physik A:Atoms and Nuclei,1977,282(3):285-292.
[4]CARLSON G C,SCHICK W C,TALBERT W L,et al.Half-lives of some short-lived mass-separated gaseous fission products and their daughters[J].Nuclear Physics A,1969,125(2):305-311.
[5]KOFOED-HANSEN O,NIELSEN K O.Shortlived krypton isotopes and their daughter substances[J].Physical Review,1951,82(1):96-97.
[6]EHRENBERG B,AMIEL S.Independent yields of krypton and xenon isotopes in thermal-neutron fission of 235 U:Observation of an odd-even effect in the element yield distribution[J].Physical Review C,1972,6(2):618-628.
[7]JOHNSON N R,O′KELLEY G D,EICHLER E.Decay of 90 Rb[J].Physical Review,1964,135(1B):36-43.
[8]MASON J F,JOHNS M W.Decay of 90 Kr and90 Rb[J].Canadian Journal of Physics,1970,48(17):2 056-2 082.
[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.DING Youqian,CUI Anzhi,YANG Zhihong,et al.Separation of 142 La from fission products by HDEHP[J].Journal of Nuclear and Radiochemistry,2003,25(4):219-222(in Chinese).
[10]核素图表编制组.核素常用数据表[M].北京:原子能出版社,1977.
[11]丁有钱,杨志红,崔安智,等.裂变产物中138 Cs的分离[J].核化学与放射化学,2005,27(3):164-168.DING Youqian,YANG Zhihong,CUI Anzhi,et al.Separation of 138 Cs from fission products[J].Journal of Nuclear and Radiochemistry,2005,27(3):164-168(in Chinese).