水中^(239+240)Pu分析的不确定度评定

Uncertainty Evaluation of ^(239+240)Pu Analysis in Water

以水中Pu的放化分析方法为基础,结合不确定度评定原理,通过建立水中^(239+240)Pu分析测量的不确定度数学模型,对不确定度各分量进行了分析和计算,得出:水中^(239+240)Pu浓度在10E-03Bq/L及以上时,Pu的全程放化回收率是水中^(239+240)Pu分析不确定度的主要来源;浓度在10E-04Bq/L及以下时,样品测量的不确定度是水中^(239+240)Pu分析不确定度的主要来源,可通过适当增加测量时间来减小样品的测量不确定度。

Based on the radiochemical analysis method of Plutonium in water,combined with the uncertainty evaluation principle,by establishing the uncertainty mathematical model of Plutonium analysis and measurement in water, the components of uncertainty are analyzed and calculated. It is concluded that when the concentration of^(239+240)Pu in water is 10E-03Bq/L or above,the full radiochemical recovery rate of Plutonium is the main source of analysis uncertainty of^(239+240)Pu in water. When the concentration of^(239+240)Pu in water is 10E-04Bq/L or below, the measurement uncertainty of sample is the main source of the analysis uncertainty of^(239+240)Pu in water, the measurement uncertainty of the sample can be reduced by appropriately increasing the measurement time.