能量色散X射线荧光谱仪在土壤中<sup>40</sup>K活度分析中的应用

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。

Abstract: 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, P＞0.05. It indicated that EDXRF could be a potential simple method for analyzing ⁴⁰K radioactive in soil samples.