能量色散荧光谱仪分析环境土壤中^(232)Th的放射性浓度

Analysis of Thorium-232 Radioactive Concentration in Soil by Energy Dispersive Fluorescence Spectrometer

为了建立快速简便地测量环境土壤中232 Th放射性浓度的方法,使用粉末压片法制样,能量色散荧光谱仪测量环境土壤中钍的质量含量,换算成232 Th的放射性浓度,经与高纯锗γ谱仪测量计算得到的232 Th的放射性浓度比较,相对偏差为6.12%～29.46%,配对t检验表明两组数据结果一致。同时考察了该方法的精密度和准确度均较好。证明可采用荧光谱仪这种简便快速的方法分析环境土壤中232 Th的放射性浓度。

In order to establish a quick and easy method to measure thorium-232 radioactivity concentration in the environmental soil,the powdered tablet sample preparation was used.The thorium quality content in environmental soil measured by energy dispersive fluorescence spectrometer,and converted into thorium-232 radioactive concentration,was compared with calculated radioactive concentration of thorium-232 measured by the high purity germanium gamma spectrometer.The relative deviation is between 6.12% and 29.46%.Paired t-test shows that the two sets of data are consistent.The precision and accuracy of the method are good.It demonstrates that the quick and easy method of fluorescence spectrometer can be used to analyze thorium-232 radioactive concentration in the soil.