摘要
该研究通过消解体系选择实验、磷钼酸铵吸附体系选择实验、硝酸-氯化铵洗涤剂替代实验、干扰消除实验等,参考国家环境保护标准HJ 816―2016中的仪器刻度和碘铋酸铯沉淀制源方法,结合低本底α/β测量仪进行样品测量,建立了一种适用于沉降物中^(137)Cs的β计数法。研究人员采用该方法与GB/T 16145―2022对沉降物样品进行比对分析,方法比对结果显示,两者无显著性差异。在方法验证实验中,该方法的精密度和正确度分别满足HJ 61―2021中对平行样相对偏差(≤30%)和加标回收率(80%~120%)的要求,典型条件下探测下限可达1.2×10^(−4) Bq·m^(−2)·d^(−1)。鉴于目前国内尚缺乏针对沉降物中^(137)Cs的β计数法分析方法标准,该研究可为相关标准体系建设提供技术参考。
[Background]There is no standard for the analysis method of beta(β)counting method for^(137)Cs in radioactive fallout in China.[Purpose]This study aims to establish a reliableβcounting method for^(137)Cs detection in fallout samples.[Methods]Firstly,a series of experiments,including digestion system selection experiment,ammonium phosphomolybdate adsorption system selection experiment,nitric acid-ammonium chloride detergent substitution experiment,and interference elimination experiment were conducted.Then,referring to the instrument scale and cesium iodobismuthate precipitation source preparation method in"State Environmental Protection Standars:HJ 816―2016",and combining with low-backgroundα/βmeasuring instruments for sample measurement,aβcounting method suitable for^(137)Cs in fallout was established.Finally,comparative analysis of this method with the GB/T 16145-2022 method was performed for verification.[Results]Comparative analysis results showed no significant differences in sedimentation sample detection.Validation experiments demonstrated that the method met precision(relative deviation of parallel samples≤30%)and accuracy(recovery rate of spiked samples ranges from 80%to 120%)requirements specified in HJ 61―2021,with lower detection limit of 1.2×10^(−4)Bq·m^(−2)·d^(−1)under typical conditions.[Conclusions]Experimental results demonstrate the viability of theβcounting method for^(137)Cs in fallout samples proposed in this study,providing technical references for the construction of relevant standard systems.
作者
甄丽颖
覃浩
朱深河
何高鹏
梁国帅
李美丽
李巧勤
王家玥
林淑倩
ZHEN Liying;QIN Hao;ZHU Shenhe;HE Gaopeng;LIANG Guoshuai;LI Meili;LI Qiaoqin;WANG Jiayue;LIN Shuqian(Guangdong Environmental Radiation Monitoring and Nuclear Emergency Response Technical Support Center,Guangzhou 510305,China)
出处
《核技术》
北大核心
2025年第11期64-73,共10页
Nuclear Techniques
