부산대학교 도서관

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 HPNMethods: 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 85μ339μ385μ385μ38539μ38539Kr concentration in the HPN purified by HP activated carbon is 6.84 85μ339μ385μ385μ38539μ38539Bq/m85μ339μ385μ385μ38539μ38539, and the 85μ339μ385μ385μ38539μ38539Ar concentration is 3.6 85μ339μ385μ385μ38539μ38539Bq/m85μ339μ385μ385μ38539μ38539 for overground HPN, while the 85μ339μ385μ385μ38539μ38539Kr concentration is 31.4 85μ339μ385μ385μ38539μ38539Bq/m85μ339μ385μ385μ38539μ38539 for underground HPN. The 85μ339μ385μ385μ38539μ38539Kr concentration in the nitrogen purified by coconut shell activated carbon is 0.46 85μ339μ385μ385μ38539μ38539Bq/m85μ339μ385μ385μ38539μ38539.Conclusions: After adsorption with activated carbon, the content of 85μ339μ385μ385μ38539μ38539Kr and 85μ339μ385μ385μ38539μ38539Ar in HPN is lower than the 50 85μ339μ385μ385μ38539μ38539Bq/m85μ339μ385μ385μ38539μ38539 required by JUNO. This work validates that the 85μ339μ385μ385μ38539μ38539Kr and 85μ339μ385μ385μ38539μ38539Ar concentrations in HPN is fit the JUNO requirement.