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广东省环境辐射监测与核应急响应技术支持中心 广州 510305
甄丽颖,女,1984年出生,2011年于东北电力大学获硕士学位,研究领域为辐射环境监测,E-mail:293595230@qq.com
收稿:2025-07-04,
修回:2025-07-21,
纸质出版:2025-11-15
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甄丽颖,覃浩,朱深河等.沉降物137Cs β计数法的分析方法研究[J].核技术,2025,48(11):110301.
ZHEN Liying,QIN Hao,ZHU Shenhe,et al.Analytical method for beta counting of 137Cs in radioactive fallout[J].NUCLEAR TECHNIQUES,2025,48(11):110301.
甄丽颖,覃浩,朱深河等.沉降物137Cs β计数法的分析方法研究[J].核技术,2025,48(11):110301. DOI: 10.3724/j.0253-3219.2025.hjs.48.250274. CSTR: 32193.14.hjs.CN31-1342/TL.2025.48.250274.
ZHEN Liying,QIN Hao,ZHU Shenhe,et al.Analytical method for beta counting of 137Cs in radioactive fallout[J].NUCLEAR TECHNIQUES,2025,48(11):110301. DOI: 10.3724/j.0253-3219.2025.hjs.48.250274. CSTR: 32193.14.hjs.CN31-1342/TL.2025.48.250274.
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
2
There is no standard for the analysis method of beta (β) counting method for
137
Cs in radioactive fallout in China.
Purpose
2
This study aims to establish a reliable β counting method for
137
Cs detection in fallout samples.
Methods
2
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-background α/β measuring instruments for sample measurement
a β counting 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
2
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
2
Experimental results demonstrate the viability of the β counting method for
137
Cs in fallout samples proposed in this study
providing technical references for the construction of relevant standard systems.
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