无源效率刻度法在检测稀土产品中^(227)Ac的应用  

Application of Sourceless Efficiency Method in Measuring ^(227)Ac in Rare Earth Products

作　　者：陈勇飞[1] 马嫱[1] 蔡继杰[1] 纪元[2] 肖伟剑 林碧芬[1] 

机构地区：[1]厦门出入境检验检疫局,厦门361026 [2]包头出入境检验检疫局,包头014010

出　　处：《核电子学与探测技术》2014年第8期1024-1028,1036,共6页Nuclear Electronics & Detection Technology

基　　金：国家质检总局科技计划项目(2013IK020)资助

摘　　要：研究了稀土产品中227Ac比活度的测定方法。利用HpGe-γ谱仪,采用无源效率刻度法,通过适当的解谱方法,测定了不同流程的稀土产品中227Ac的比活度。结果表明:第一,在La2O3等镧产品中,一般伴随着227Ac,227Ac是造成氧化镧产品污染的重要核素;第二,当谱图中351 ke V处峰计数高,而609 ke V处峰计数低时,可以初步断言227Ac子体211Bi的存在;第三,在快速分析227Ac时,可以不考虑234Pa的影响。The paper studies the determination method of the specific activity of 227 Ac in rare earth products .By the application of sourceless efficiency method on HpGe -γray spectrometer ,we have measured the specific ac-tivity of 227 Ac in rare earth products of different processes through appropriate analysis of the spectrum .The re-sults show that：firstly, lanthanan products , such as lanthana , is generally accompanied by 227 Ac, which con-tributes greatly to the contamination of lanthana .Secondly, the existence of 211Bi,daughter of 227Ac ,could be affirmed when the net counts of the peak at the energy of 351 keV presents high , while thepeak at energy of 609 keV low in the spectrum!Thirdly, the influence of 234 Pa could be ignored in the rapid analysis of 227 Ac.

关 键 词：HpGe-γ谱仪 无源效率 稀土 ^227Ac 

分 类 号：TL817[核科学技术—核技术及应用]