低本底条件下氡及其子体的抑制研究  

Study on the inhibition of radon and its daughters under low background conditions

作　　者：张乐[1] 刘书魁[2] 林兴德[2] 幸浩洋[2] 朱敬军[1] ZHANG Le;LIU Shu-Kui;LIN Xing-De;XING Hao-Yang;ZHU Jing-Jun(Key Laboratory of Radiation Physics and Technology of Ministry of Education,Institute of Nuclear Science and Technology,Sichuan University,Chengdu 610064,China;College of Physics,Sichuan University,Chengdu 610064,China)

机构地区：[1]四川大学原子核科学技术研究所辐射物理及技术教育部重点实验室,成都610064 [2]四川大学物理学院,成都610064

出　　处：《四川大学学报（自然科学版）》2020年第5期975-979,共5页Journal of Sichuan University(Natural Science Edition)

基　　金：国家重点研发计划“大科学装置前沿研究”重点专项“高纯锗阵列直接探测暗物质实验”课题三“高纯锗阵列液氮低温系统本底研究和控制”(2017YFA0402203)。

摘　　要：稀有事例的探测需要极低的本底,氡及其子体是主要的本底来源之一.文章根据地下实验室1725m^3液氮除氡需求,设计了一套液氮除氡系统,初步测试了KC-6系列活性炭在-10^-120℃下的除氡效果.实验结果表明,误差函数能很好地拟合活性炭在不同温度下的穿透曲线.拟合数据表明在-10和-30℃下活性炭对氡的动力学吸附系数分别为23.01±0.33和58.68±0.63L/g.有限的数据表明在-120℃下没有氡溢出,但是可以算出此时的动力学吸附系数已经大于432L/g.文章中所得到的数据将为低放射本底液氮中氡的去除研究奠定基础.The detection of rare cases requires a very low background,and radon and its daughters are one of the main background sources.In this paper,a set of liquid nitrogen radon removal system was designed according to the demand for radon removal of 1725 m^3 liquid nitrogen in the underground laboratory,and the radon removal effect of KC-6 series activated carbon was preliminarily tested at-10^-120℃.Experimental results show that the error function can well fit the penetration curve of activated carbon at different temperatures.The fitted data shows that the dynamic adsorption coefficients of radon on activated carbon at-10 and-30℃are 23.01±0.33 and 58.68±0.63 L/g,respectively.Limited data indicate that there is no radon overflow at-120℃.However,it can be calculated that the dynamic adsorption coefficient is already greater than 432 L/g.The data obtained in this paper could lay a foundation for the study of radon removal from low emission background liquid nitrogen.

关 键 词：氡 低本底 活性炭 液氮 

分 类 号：O571.32[理学—粒子物理与原子核物理]