水产品中放射性核素-氚活度浓度测量不确定度评定  

Evaluation of uncertainty in measurement of radionuclide-tritium activity concentration in aquatic products

作　　者：褚莹倩 张晓林 郭萌 孙瑶 李雪花[2] 马雪萍 关庆涛 李林朋[4] CHU Yingqian;ZHANG Xiaolin;GUO Meng;SUN Yao;LI Xuehua;MA Xueping;GUAN Qingtao;LI Linpeng(Technology Center of Dalian Customs,Dalian 116001,China;Key Laboratory of Industrial Ecology and Environmental Engineering,School of Environmental Science and Technology,Dalian University of Technology,Dalian 116024,China;Ecological and Environment Monitoring Center of Liaoning Province,Dalian 116001,China;Modern Education Technology Center,Dalian Medical University,Dalian 116044,China)

机构地区：[1]大连海关技术中心,辽宁大连116001 [2]大连理工大学环境科学与工程学院,工业生态与环境工程教育部重点实验室,辽宁大连116024 [3]辽宁省生态环境监测中心,辽宁大连116001 [4]大连医科大学现代教育技术中心,辽宁大连116044

出　　处：《海洋环境科学》2024年第6期973-979,共7页Marine Environmental Science

基　　金：大连海关科研项目(2023DK10);辽宁省科技计划联合计划(应用基础研究项目)(2023JH2/101700338);海关总署科研项目(2024HK002)。

摘　　要：关于生物样品基质中氚活度浓度的测量不确定度评定的研究报道较少,为提高水产品中放射性核素测定结果的可靠性和准确性,本研究通过数学模型对水产品中氚活度浓度的不确定度进行评定,利用液体闪烁计数器测量水产品中氚活度浓度,分析测量过程中不确定度的来源,包括样品计数、探测效率、氧化燃烧装置回收率、样品称量、待测水样取样体积等因素。结果表明,对于测试的鳕鱼(Gadus)、三文鱼(Oncorhynchus)、帝王蟹(Paralithodes camtschaticus)样品,样品计数和仪器探测效率引入的不确定度为氚活度浓度测量不确定度的主要来源,本试验测得鳕鱼、三文鱼和帝王蟹样品中放射性核素氚的活度浓度分别为(10.6±0.95)Bq/kg、(6.0±0.72)Bq/kg和(10.4±1.01)Bq/kg,包含因子k=2。该评定可以为水产品中氚活度浓度的不确定度评定提供参考。There are few reports on the evaluation of uncertainty for the tritium activity concentration in biological sample.In order to improve the measurement reliability and accuracy of the results for radionuclide determination in aquatic products,in this study,a mathematical model was used to evaluate the uncertainty of the tritium activity concentration in aquatic products.The liquid scintillation counter was used to measure the concentration of tritium activity in aquatic products and an analysis was conducted on the uncertainties in the measurement process,including sample counting,detection efficiency,the recovery rate of oxidation combustion device,sample weighing,the volume of measured water sample and other factors.For measured codfish(Gadus),salmon(Oncorhynchus),and king crab(Paralithodes camtschaticus)samples,the results show that the uncertainties introduced by the sample counting and detection efficiency are the main factors.The activity concentration of the radionuclide tritium in the codfish,salmon,and king crab samples are(10.6±0.95)Bq/kg,(6.0±0.72)Bq/kg and(10.4±1.01)Bq/kg respectively,with the inclusion factor k=2.This evaluation can serve as a reference for the uncertainty evaluation of the tritium activity concentration in aquatic products.

关 键 词：水产品 氚 放射性核素 不确定度 

分 类 号：X55[环境科学与工程—环境工程]