食品与机械2025，Vol.41Issue(5)：58-63,6.DOI:10.13652/j.spjx.1003.5788.2024.80923
低本底α/β测量仪测定食品中铯-137含量的不确定度评定
Uncertainty evaluation for Cs-137 in food by low-background α/β counter
摘要
Abstract
[Objective]To improve the measurement accuracy of cesium-137(Cs-137)content in food using low-background α/β measuring instruments.[Methods]An uncertainty analysis model for measuring Cs-137 in food was established based on the second method in GB 14883.10-2016.The uncertainty components affecting the detection process were analyzed,the sources of uncertainty were explored,and the uncertainty was evaluated.[Results]Through uncertainty analysis introduced by sample measurement,supervised source measurement,cesium recovery rate calibration,sample sampling,sample ash-to-fresh ratio,standard source calibration supervised source,and self-absorption coefficient calibration,the activity concentration of Cs-137 in food determined by the ammonium phosphomolybdate method was 1.44 Bq/kg,with an expanded uncertainty of 0.13 Bq/kg(k=2).[Conclusion]The main factor affecting the uncertainty of Cs-137 measurement in food by low-background α/β measuring instruments is the uncertainty introduced during the sample measurement process,followed by the uncertainty introduced by the standard source calibration supervision source.关键词
铯-137/低本底α/β测量仪/磷钼酸铵法/不确定度Key words
Cs-137/low-background α/β counter/ammonium phosphomolybdate method/uncertainty引用本文复制引用
孙功明,李冠超,黄玲玉,李巧勤,李美丽..低本底α/β测量仪测定食品中铯-137含量的不确定度评定[J].食品与机械,2025,41(5):58-63,6.基金项目
省级海洋资源管理与利用专项资金项目(编号:粤财资环[2023]20号) （编号:粤财资环[2023]20号）
