能量色散X射线荧光谱仪在土壤中40K活度分析中的应用

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40K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40K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 r-test by SPSS program, which showed that there was no significant difference in the two sets of data, P>0. 05. It indicated that EDXRF could be a potential simple method for analyzing 40K radioactive in soil samples.