气载流出物取样系统放射性单质碘损失率实验研究  

An Experimental Study of Radioactive Elemental Iodine Loss Ratio from Smapling System of Airborne Effluent

作　　者：张雪平[1] 杨康 陈泽翔 蔺健 林爽 陈建利[1] 梁飞[1] 任宏正 李世军[1] 李永国[1] 张伟 ZHANG Xueping;YANG Kang;CHEN Zexiang;LIN Jian;LIN Shuang;CHEN Jianli;LIANG Fei;REN Hongzheng;LI Shijun;LI Yongguo;ZHANG Wei(CNNC Key Laboratory of Radioactive Gas Purification Technology,China Institute for Radiation Protection,Taiyuan,030006,China;China Nuclear Power Engineering Co.,Ltd,Beijing,100840,China)

机构地区：[1]中国辐射防护研究院中核集团放射性气体净化技术重点实验室,山西太原030006 [2]中国核电工程有限公司,北京100840

出　　处：《核电子学与探测技术》2025年第3期429-434,共6页Nuclear Electronics & Detection Technology

摘　　要：放射性单质碘作为核电站烟囱气载流出物中放射性核素之一,由于其排放浓度较低,可能存在排放量比真实排放值偏低,因此在进行核电站烟囱气载流出物放射性碘排放时应充分考虑采样过程中的损失,对采集效率进行校正,应考察放射性碘在核电站烟囱取样系统中的碘沉积损失率。对放射性碘损失率研究国外一般采用放射性示踪剂进行测量,国内还未见到相关报道。通过研究单质碘在不同取样系统中的损失率、不同浓度单质碘在取样系统中的损失率、预暴露前后单质碘在取样系统中的损失率以及模拟单质碘在现场取样系统中的损失率,结果表明:相同浓度单质碘在不锈钢取样系统中的平均碘损失率为2.14%;单质碘源活度浓度不同,损失率也不同,不锈钢取样系统单质碘最大损失率为4.17%;特氟龙与不锈钢取样系统相比单质碘损失率更低;不锈钢管取样系统预暴露后,单质碘损失率会有所下降;估算现场取样系统两种连接方法单质碘损失率有所不同,分别为2.48%和1.73%。Radioactive elemental iodine is one of radioactive discharge nuclides,because of lower emission concentration it is possible that emissions of radioactive elemental iodine are lower than they really are.So loss ratio of radioactive substance from the nuclear power station chimney should be considered in the process of sampling,and the acquisition efficiency need be corrected.Regarding the study of radioactive elemental iodine loss ratio radioactive tracer measurement can be applied overseas,there were no domestic reports.An experimental study about loss ratio of radioactive elemental iodine is practiced from several facts,such as repeatability,concentration,different sampling system,iodine preexposure and field simulation.Results show that the average loss radio of radioactive elemental iodine in stainless steel sampling system is 2.14%,loss ratio can change with activity concentration of radioactive element iodine and maximum is 4.17%,loss radio of radioactive elemental iodine in teflon is lower than stainless steel,after preexposure of radioactive elemental iodine loss ratio shows a decline,and loss ratio is about 2.48%and 1.73%respectively by two connection methods in field simulation.

关 键 词：放射性单质碘 损失率 取样系统 气载流出物 

分 类 号：TL77[核科学技术—辐射防护及环境保护]