堆芯铝合金样品中^(63)Ni的液闪测定技术  

Determination of ^(63)Ni in Aluminum Alloy Samples From Nuclear Reactor Core by Liquid Scintillation Method

作　　者：王萍[1] 苏容波[1] 吴涛[1] 李烨[1] 但贵萍[1] 杜良[1] 孙宇[1] 

机构地区：[1]中国工程物理研究院,四川绵阳621900

出　　处：《核化学与放射化学》2012年第3期185-188,共4页Journal of Nuclear and Radiochemistry

摘　　要：为建立堆芯铝合金样品中63 Ni活度测量的方法,对63 Ni液闪测量的相关问题进行了研究。样品经前处理后用液闪进行测量,相应的前处理流程包括样品的溶解、阴离子交换分离、氢氧化物沉淀及萃取分离程序。通过条件实验对液闪测量过程的相关参数进行了比较研究,包括样品液酸度、样品液与闪烁液体积比及镍载体的加入量等。3110型液体闪烁能谱仪对不同活度63 Ni标准系列的测量效率均在70%以上,样品液酸度选择为0.3mol/L,样品液与闪烁液体积比选择为1∶2,镍载体加入量选择为5mg。通过空白实验得出计数的标准偏差为0.077/s,相对标准偏差为15.3%(n=12),方法检出限为1.38Bq/g。该方法适用于反应堆退役样品的分析测量。To establish a method of measuring the radioactivity of 63Ni in aluminum alloy samples from nuclear reactor core, various relevant problems were studied. Samples were pretreated before liquid scintillation counting （LSC） by dissolution, anion exchange separation, hydroxide precipitation, and solvent extraction procedures. LSC-related parameters, such as sample solution acidity, sample solution-to-cocktail volume ratio, and added nickel carrier amount, were investigated. The detection efficiency of Tri-Carb 3110 liquid scintillation spectrometer with respect to 63 Ni for a series of 63 Ni standards of different activities are all better than 70%. The recommended experimental conditions are listed below： sample acidity 0.3 mol/L, sample-to-cocktail volume ratio 1 ： 2, Ni carrier amount 5 mg. The standard deviation of 0. 077/s and the relative standard deviation of 15.3%（n=12） are found for blanks. The detection limit is 1.38 Bq/g. The present method is suitable to analyze samples for decommissioning of nuclear reactors.

关 键 词：铝合金 测量效率 标准偏差 检出限 

分 类 号：O657.4[理学—分析化学]