Study of the concentrations of Kr and Ar in high-purity nitrogen of JUNO  

作　　者：Haodong Zhang HaiSheng Song Xin Ling Tao Hu Li Zhou Xiao Cai Jian Fang Lijun Sun Xilei Sun Yuguang Xie Junyu Shao Chengkai Yang Xinghua Li Shengjie Jin Wenbao Qu Shuaishuai Ren Boxiang Yu 

机构地区：[1]College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou,730070,Gansu,China [2]Institute of High Energy Physics,Chinese Academy of Sciences,Beijing,100049,China [3]State Key Laboratory of Nuclear Detection and Nuclear Electronics,Institute of High Energy Physics,Beijing,100049,China [4]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing,100049,China [5]College of Nuclear Science and Technology,University of South China,Hengyang,421001,Hunan,China

出　　处：《Radiation Detection Technology and Methods》2024年第3期1359-1365,共7页辐射探测技术与方法（英文）

基　　金：supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA10010500).

摘　　要：Purpose In the JUNO,the LS serves as the medium for detecting neutrinos.When purifying the LS using HPN,it is essential to ensure low background levels of radioactive krypton and argon in the HPN Methods Using the low-temperature physical adsorption properties of activated carbon to adsorb and separate radioactive gases such as radon,krypton,and argon from nitrogen in a liquid nitrogen environment.Results Our results indicated that the Kr concentration in the HPN purified by HP activated carbon is 6.84μBq/m,and the Ar concentration is 3.6μBq/m for overground HPN,while the Kr concentration is 31.4μBq/m for underground HPN.The^(85)Kr concentration in the nitrogen purified by coconut shell activated carbon is 0.46μBq/m.Conclusions After adsorption with activated carbon,the content of^(39)Kr and Ar in HPN is lower than the 50μBq/m required by JUNO.This work validates that the^(85)Kr and^(39)Ar concentrations in HPN is fit the JUNO requirement.

关 键 词：JUNO Liquid scintillator LOW-BACKGROUND HPN Low-temperature physical adsorption 

分 类 号：TL7[核科学技术—辐射防护及环境保护]