六道管式炉氧化燃烧联合分离海产品中有机结合氚与^(14)C的影响因素研究与不确定度评定  

Influencing factors and uncertainty assessment for the simultaneous separation of organically bound tritium and^(14)C from marine products using a six-tube combustion device

作　　者：曹艺耀 任鸿 尹亮亮[1] 吉艳琴[1] Cao Yiyao;Ren Hong;Yin Liangliang;Ji Yanqin(Key Laboratory of Radiological Protection and Nuclear Emergency,China CDC,WHO Collaborating Centre for Radiation and Health,National Institute for Radiological Protection,Chinese Center for Disease Control and Prevention,Beijing 100088,China;Zhejiang Provincial Center for Disease Control and Prevention,Hangzhou 310051,China)

机构地区：[1]中国疾病预防控制中心辐射防护与核安全医学所,辐射防护与核应急中国疾病预防控制中心重点实验室,世界卫生组织辐射与健康合作中心,北京100088 [2]浙江省疾病预防控制中心,杭州310051

出　　处：《中华放射医学与防护杂志》2024年第4期305-311,共7页Chinese Journal of Radiological Medicine and Protection

基　　金：国家重点研发计划项目(2019YFC1604804)。

摘　　要：目的建立海产品中有机结合氚(OBT)与^(14)C的联合处理检测方法,分析测量过程中不确定度的来源并进行评定,实现海鱼、海虾、海蟹、海贝和海藻等不同种类海产品中的OBT和^(14)C的快速、准确测定。方法采用六道管式燃烧装置结合自制六通玻璃管,研究联合氧化燃烧与收集海产品中OBT和^(14)C的方法;分析评定元素分析、氧化燃烧、液体闪烁计数测量等过程中引入的不确定度。结果建立了5管合并收集OBT、单管收集^(14)C的联合分离方法,-110℃冷阱收集条件下氢的燃烧回收率得到有效提升,样品转移时的损耗更少,收集碳所需氢氧化钠、氯化铵和氯化钙等试剂的用量大大降低。联合分离5.0 g样品中氢和碳(包含所有氢和碳的同位素),葡萄糖中氢和碳的燃烧回收率分别为98.7%和93.1%,5种海产品中氢和碳的燃烧回收率分别为92.5%~97.3%和82.7%~96.3%,3次平行性实验相对标准偏差均<5%,表明该方法具有良好的准确性和精密度。样品计数是结果不确定度的主要来源,其次为元素含量分析和计数效率。结论本研究建立的海产品中OBT和^(14)C联合分离体系燃烧回收率高、处理时间短、分离效果好、获得量足,可有效减少样品使用量,能满足海产品放射性污染健康风险评估要求。Objective To develop a method for simultaneously processing and determining organically bound tritium(OBT)and^(14)C in marine products and to analyze and evaluate the causes of the uncertainty in the determination process,aiming to achieve the rapid and accurate determination of OBT and^(14)C in marine products such as sea fish,shrimp,crab,seashells and seaweed.Methods A six-tube combustion device equipped with a self-made six-way glass tube was utilized to develop a method for simultaneous complete combustion and collection of OBT and^(14)C in marine products.The uncertainty introduced in the processes such as elemental analysis,complete combustion,and liquid scintillation counting(LSC)was analyzed and evaluated.Results A simultaneous separation method,collecting OBT using five tubes and^(14)C using a single tube,was developed.Using this method,the combustion-based hydrogen(H)recovery was improved effectively using a-110℃cold trap,the loss of samples during transfer decreased,and the quantity of reagents,such as sodium hydroxide,ammonium chloride,and calcium chloride,required for carbon collection greatly decreased.The H and C,including all of their isotopes,were simultaneously separated from 5.0 g of samples using the method,yielding combustion-based H and C recovery of 98.7%and 93.1%,respectively for glucose and ranging from 92.5%to 97.3%and from 82.7%to 96.3%,respectively for five types of marine products.Three parallel experiments produced relative standard deviations(RSDs)of all less than 5%,indicating the high accuracy and precision of the method.The uncertainty primarily originated from sample counting,followed by the element content analysis and counting efficiency.Conclusions The method for the simultaneous separation of OBT and^(14)C from marine products developed in this study exhibits high combustion-based recovery,short processing time,ideal separation effects,and sufficient yield,thus effectively reducing the consumption of samples and meeting the requirements for the assessment of health risks c

关 键 词：海产品 有机结合氚 ^(14)C 不确定度 

分 类 号：R144[医药卫生—公共卫生与预防医学]