氙同位素丰度参考气制备方法研究  

Preparation of xenon isotope abundance reference gas

作　　者：杨天丽[1] 罗立力[1] 青颖 张苏敏[2] 周鑫[2] YANG Tianli;LUO Lili;QING Ying;ZHANG Sumin;ZHOU Xin(Chinese Academy of Engineering Physics Institute of Nuclear physics and Chemistry,Mianyang 621900,China;National Institute of Measurement and Testing Technology,Chengdu 610021,China)

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621900 [2]中国测试技术研究院,四川成都610021

出　　处：《中国测试》2024年第S01期94-99,共6页China Measurement & Test

摘　　要：氙同位素丰度比高精度质谱分析技术强烈依赖于氙同位素丰度参考气,参考气的准确制备是关键技术。研究分析了高纯^(128)Xe同位素气体原料中杂质同位素的丰度,采用重量法制备了丰度为80%、91%和92%的^(128)Xe同位素丰度参考气,评定了参考气制备过程引入的不确定度,并采用稀有气体同位素质谱仪对制备的参考气进行验证。结果表明,^(128)Xe同位素丰度参考气制备过程引入的扩展不确定度为0.7%(k=2),制备值与验证值的偏差小于0.2%,表明制备的^(128)Xe同位素丰度参考气量值准确可靠,该同位素丰度参考气能够满足实验室分析质量控制的要求。The high-precision mass spectrometric analysis technology for the abundance ratio of xenon isotopes heavily relies on the xenon isotope abundance reference gas,the accurate preparation of this reference gas is a key technique.This study analyzed the abundance of impurity isotopes in high-purity 128Xe isotope gas materials and prepared reference gases with 128Xe isotope abundances of 80%,91%,and 92%using the gravimetric method.It evaluated the uncertainty introduced during the preparation process of the reference gas and verified the prepared reference gas using a rare gas isotope mass spectrometer.The results showed that the expanded uncertainty introduced during the preparation process of the 128Xe isotope abundance reference gas was 0.7%(k=2),and the deviation between the preparation value and the verification value was less than 0.2%.This indicates that the prepared 128Xe isotope abundance reference gas has accurate and reliable values,meeting the requirements of laboratory analysis quality control.

关 键 词：氙同位素 重量法 同位素质谱法 

分 类 号：TL817[核科学技术—核技术及应用] O657.63[理学—分析化学]