2023/08/14 by Mingxuan Li, Qianyun Li, Li, Qian-Yun +16
Environmental Science · Health Professions · Physics and Astronomy · #FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #Radiation Detection and Scintillator Technologies #Radioactive contamination and transfer #Radioactivity and Radon Measurements
paper · pdf · doi:10.48550/arxiv.2308.07160
openalex publication_date 2023/08/14 · openalex created_date 2023/08/16 · openalex updated_date 2026/07/28
We construct a high sensitivity radon pilot detector using liquid scintillator dissolved radon for the CDEX rare-event searches program. The CDEX-10 project employs a germanium detector array immersed in a massive liquid nitrogen tank. However, radon emanated from the surface of the tank can contribute background. As a result, radon contamination in the liquid nitrogen tank must be regulated and monitored, which necessitates the use of a low-level Rn measuring device. The radon-dissolved liquid scintillator (LS) detectors utilizes cascade decay selections, yielding a unique signature. All background events occurring in the LS, with regard to the system and co-efficiency of Rn absorption, have been studied. Background activity is measured to be 59.8±18.4 μBq per 300 mL LS. Meanwhile, it shows that radon concentration absorbed by LS will be saturated and is linearly related to radon concentration in nitrogen gas. Furthermore, the co-efficiency factor can be optimized by lowering temperature or raising pressure. Eventually the detection limit for 222Rn in nitrogen gas is observed to be 9.6 mBq/m3.