Quality control of gross α and gross β analysis in water / 中华放射医学与防护杂志

ABSTRACT

Objective:To improve the precision and accuracy of gross radioactivity detection in water, and to improve the radiological health and environmental monitoring level of each laboratory, it is necessary to carry out method verification and quality control.Methods:The thick source method for gross α and the thin source method for gross β analysis were used to analyze the actual samples. After multiple tests, the precision of the detection was calculated. Through the spike recovery test and the comparison sample analysis of the national radiological health in 2019, the accuracy analysis of the method was performed.Results:In the precision experiment, the relative standard deviations of the gross α and gross β results were 23% and 13%, respectively. The three spike recoveries were 103.1%, 103.5%, and 105.8%, respectively. The relative errors of gross α and gross β compared with the reference value were 0.92% and 9.4%, respectively. All the result reflected the high accuracy of the method .Conclusions:The relative standard deviations, recoveries, and relative errors in the method validation and quality control were below the limits of the criterion. This work systematically discussed the major factors that may cause errors in the detection, which could further improve the level of radiological health and environmental monitoring.