Radon measurement in liquid scintillator with nitrogen stripping method

Purpose Liquid scintillator is the target material of neutrino in Jiangmen Underground Neutrino Observatory (JUNO) detector. it is necessary to control the radon at a very low level.
Methods In this work, a device was set up to strip the radon from liquid scintillator with high-purity nitrogen bubbling, and the radon carrier nitrogen was collected into radon measurement chamber to measure radon concentration, then the stripping efficiency of radon in liquid scintillator can be measured.
Results Under normal temperature and 2 L/min gas flow rate, the stripping efficiency of radon in liquid scintillator is 3.85 \% .
Conclusions The preliminary radon stripping results show that the high-purity nitrogen stripping radon in the liquid scintillator has efficiency, and the device has the ability to measure radon concentration in the liquid scintillator, as well as the stripping device provides a basis for further low concentration radon measurement in the liquid scintillator.