海水中^(137)Cs和^(90)Sr分析的实验室间比对

Inter-comparison results of^(137)Cs and^(90)Sr in seawater among analytical laboratories

为提高海洋环境放射性核素监测水平,开展了海水中^(137)Cs和^(90)Sr的实验室间测量比对活动。^(137)Cs测量结果与参考值的相对偏差为-2.99%~5.97%,测量结果的准确度、精密度和正确度均满足比对要求,比对评价结果均为“合格”;^(90)Sr测量结果与参考值的相对偏差为-41.58%~3.96%,其中12个实验室的比对评价结果为“合格”,1个实验室的比对评价结果为“不合格”。本次比对活动,各参比实验室的整体比对结果良好。

Inter-comparison results among analytical laboratories for the measurements of^(137)Cs and^(90)Sr in seawater in 2020 is described in this paper.The spiked seawater samples were distributed to 13 participating laboratories,and their analytical results were compared to the reference values.The relative deviation of^(137)Cs between measured values and reference value was-2.99%to 5.97%.The results had passed all criteria and were assigned“Accepted”status as a final score.In the case of^(90)Sr,one measured result did not pass the accuracy test and correctness test,so it was considered as“Not Accepted”.All other results were accepted.The analytical laboratories participating in this inter-comparison have good overall comparison results.