中国散裂中子源的空气活化监测与评价

Monitoring and evaluation of air activation in China spallation neutron source

中国散裂中子源是我国正在运行的质子加速器大科学实验装置,保证其空气活化水平处于可监测、可控状态,对确保装置的正常运行和科研产出、确保工作人员和公众的辐射安全具有重要意义。国内外以往对加速器空气活化的认识基本都来自参考文献和理论计算;由于没有针对性研发,以往国内加速器的空气活化监测没有测量到空气活化核素及其浓度。2019年底,散裂中子源研发了在线空气活化监测系统,成功监测到了空气活化的主要放射性核素及其活度浓度。本文介绍了该系统的研发情况和监测结果,并提出了对加速器空气活化监测与评价的一些看法。

China Spallation Neutron Source(CSNS)is a large scientific experimental device of proton accelerator in operation in China.It is of great significance to ensure the normal operation and scientific research output of the equipment and the radiation safety of the staff and the public,and to ensure the air activation level at a monitored and controllable state.The previous understandings of accelerator air activation at home and abroad are almost coming from references and theoretical calculations.Due to lack of specific research and design,no air induced radionuclides and their concentrations have been measured in previous domestic accelerators’air activation monitoring.Late of 2019,an online air activation monitoring system was developed in CSNS,which successfully detected the major radionuclides and their activity concentrations in air activation.This paper introduces the research and development of the system and the monitoring results,and puts forward some views on the monitoring and evaluation of accelerator air activation.