基于PIPSBOX测量气态14C流出物装置的设计  

Design of a Device for Measuring Gaseous Radiocarbon Effluent Based on PIPSBOX

作　　者：张彦彪 汪传高[1] 郭庐阵[1] 肖思敏 骆志平[1] 邬蒙蒙[1] 庞洪超[1] 吴展华[1] 刘畅[1] ZHANG Yanbiao;WANG Chuangao;GUO Luzhen;XIAO Simin;LUO Zhiping;WU Mengmeng;PANG Hongchao;WU Zhanhua;LIU Chang(China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院,北京102413

出　　处：《核电子学与探测技术》2024年第5期824-831,共8页Nuclear Electronics & Detection Technology

摘　　要：14C作为环境影响评价中的重要核素,现有测量技术很难实现核设施气态14C流出物的在线测量。基于PIPSBOX测量技术研制了气态14C流出物在线测量装置的原理样机,模拟了PIPSBOX测量14C的探测效率,理论证明测量的可行性。通过将不同形式的14C气体转化为14CO_(2)形态,以便进行低温分离14CO_(2)提高14C浓度,最后实现PIPSBOX测量14C气体。最终在3 h内,该系统测量14C的最小可探测活度浓度达到0.99 Bq/m3,小于现在连续取样一周的探测下限10 Bq/m^(3),这项工作建立了14C测量新方法,实现了气态14C流出物的在线测量,也为大气中14C在线测量提供参考。As an important nuclide in environmental impact assessment,it is challenging to realize the on-line measurement of gaseous radiocarbon effluents from nuclear facilities.An on-line measuring prototype for gaseous radiocarbon effluents based on PIPSBOX measurement technology was developed.The detection efficiency of gaseous radiocarbon measured by PIPSBOX was simulated by Geant4.The results demonstrated that measurements using the PIPSBOX was feasible.An on-line sampling system of gaseous radiocarbon gas was developed with oxidizing diferent forms of radiocarbon gases into 14CO_(2),and separating out 14CO_(2) by means of low temperature separation.Then,the interface of the PIPSBOX was designed and a spectroscopy system was used for the analysis and detection of radiocarbon.Finally,within 3 hours,the minimum detectable activity concentration of radiocarbon measured by the system was 0.99 Bq/m^(3),which was lower than the minimum activity concentration of 10 Bq/m with continuous collecting radiocarbon for one week.This work establishes a new method for radiocarbon measurement,realizes the on-line measurement of gaseous radiocarbon effluents,and provides reference for the on-line measurement of radiocarbon in the atmosphere.

关 键 词：气态14C 在线测量 PIPSBOX 最小可探测活度浓度 

分 类 号：TL814[核科学技术—核技术及应用]