A nitrogen purification pilot plant has been developed to meet the requirements of high purity nitrogen used in the Jiangmen Underground Neutrino Observatory (JUNO).
The radon content in nitrogen dropped from (20.5 ± 0.9) mBq/Nm3 (statistical error) to (25.2 ± 4.5) μBq/Nm3 (stat.) after purification. The Rn reduction factor of the nitrogen purification pilot plant was estimated to be 813 under the condition of 20 mBq/Nm3 of radon activity. Another experimental result showed that the radon activity dropped from (61.6 ± 7.5) μBq/Nm3 (stat.) to (19.2 ± 2.1) μBq/Nm3 (stat.) after nitrogen flew out from the nitrogen purification pilot plant. It shows that the radon activity of nitrogen after purified by the nitrogen purification pilot plant meets the cleanliness requirement of JUNO and the Rn reduction factor of the nitrogen purification pilot plant would decline when the radon activity of raw nitrogen declines to dozens of μBq/Nm3.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.