The laboratory measurement of radioactivity purification for Pb212 in   liquid scintillator
  The liquid scintillator (LS) has been widely utilized in the past, running and future neutrino experiments, and requirement to the LS radio-purity is higher and higher. The water extraction is a powerful method to remove soluble radioactive nuclei, and a mini-extraction station has been constructed. To evaluate the extraction efficiency and optimize the operation parameters, a setup to load radioactivity to LS and a laboratory scale setup to measure radioactivity which use Bi^{212}-Po^{212}-Pb^{208} cascade decay are developed. Experiences from laboratory study will be useful to large scale water extraction plants design and the optimization of working in future. 
Wei Hu, Jian Fang, Boxiang Yu, Xuan Zhang, Li Zhou, Xiao Cai, Lijun   Sun, Wanjin Liu, Lan Wang and Junguang Lv
physics.ins-det hep-ex