摘要
目的 探索LabSOCS无源效率刻度在级联辐射引起的符合相加修正上的应用.方法 利用LabSOCS无源效率刻度软件生成4个标准源的模拟效率曲线,使用实验室高纯锗γ能谱仪测量这4个标准源,在活度分析时计算符合相加修正因子,对测量结果进行符合相加修正,将修正后的放射性活度与证书活度进行比较,并使用GB/T 28043-2019/IS0 13528:2015中能力评定统计量En值评定.结果 测量结果活度值与证书活度值进行比较,符合相加修正后偏差绝对值范围在0.14％～3.87％,且统计量En值绝对值均＜1.结论 LabSOCS在级联辐射引起的符合相加修正上的应用效果较为理想,符合相加修正后的活度值与证书活度值偏差不大,其能力评定结果是合格的.
Abstract
Objective To explore the application of laboratory sourceless calibration software(LabSOCS)in coincidence summing correction for cascade radiation.Methods LabSOCS was employed to plot the simulated efficiency curves of four standard source samples.The radioactivity of these samples was measured using a high purity germanium(HPGe)gamma ray spectrometer at the laboratory.Then the coincidence summing correction factors were calculated during the analysis of their radioactivity,followed by the coincidence summing correction for the measured radioactivity.The corrected radioactivity was compared with the certificate activity values and was then assessed based on the statistical En scores for proficiency testing stipulated in GB/T 28043-2019/ISO 13528∶2015.Results The comparison between the measured radioactivity and the certificate activity values of the standard source samples revealed that the absolute deviation of the measured radioactivity after coincidence summing correction ranged from 0.14％to 3.87％and the absolute values of the statistical En scores were all＜1.Conclusions The application of LabSOCS to the coincidence summing correction caused by cascade radiation can yield ideal result,with the corrected radioactivity exhibiting little deviation from the certificate activity values,indicating qualified proficiency testing result.
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