能量色散X射线荧光谱仪在土壤中^(40)K活度分析中的应用  

Determination of ^(40)K Radioactivity in the Soil Using Energy Dispersive X Ray Fluorescence Spectrometer

作　　者：陆巍巍[1] 宋福祥[2] 曾丽萍[2] 吕红宁[2] 

机构地区：[1]环境保护部核与辐射安全中心,北京100082 [2]北京市辐射安全技术中心,北京100089

出　　处：《同位素》2012年第4期239-242,共4页Journal of Isotopes

摘　　要：对粉末样品进行压片制样,建立了能量色散X射线荧光(EDXRF)谱仪测定环境土壤样品中40 K放射性活度的方法。方法标准曲线的相关系数为0.991 0,测量的精密度为2.98%,测量标准样品的最大相对偏差为6.40%。采用本方法和γ谱仪同时测量7个土壤样品,并对这两种分析方法的测量结果采用配对t检验SPSS程序计算。结果表明,两种方法所得数据无显著性差异(P>0.05),可使用X射线荧光谱仪法分析土壤中40 K的放射性活度。这种方法操作简便,精密度和准确度较好,具有广泛的实用性。The 40K radioactive of the pressed powder sample was determined by Epsilon 5 high-energy polarized energy dispersive X ray fluorescence（EDXRF） spectrometer.The correlation coefficient of the standard curve method was 0.991 0,the precision was 2.98% and the relative deviation of the measurement standard samples was up to 6.40%,which showed that the precision and accuracy of the method were also good.Simultaneous measurement of seven soil samples using this method and γ-spectrometer were carried,the resluts of two analytical methods were compared using a paired t-test by SPSS program,which showed that there was no significant difference in the two sets of data,P0.05.It indicated that EDXRF could be a potential simple method for analyzing 40K radioactive in soil samples.

关 键 词：X射线荧光谱仪 40K 放射性活度 

分 类 号：O657.34[理学—分析化学]