氡在聚合物膜中渗透系数的测定

摘要

To provide a reference for selection of polymer films in Jiangmen neutrino experiments ,a method for measuring the permeability of radon through polymer films has been developed .A device based on the measure-ment of liquid scintillationhas also been produced ,and various polymefoilsof the radon diffusion coefficient were tested .The results show that:the background and air impermeability of the device mainly accorded the prospec -tive desire;it takes at least 18 days for polymer films after establishing stationary radon diffusion through the sample;the permeability coefficient of PVC film is the lowest .%为向江门中微子实验用膜的选择提供参考，研究了一种测定氡在聚合物膜中渗透系数的方法，设计加工出可利用闪烁液进行采样的膜渗透采样装置，并测量了不同类型聚合物膜的渗透系数。实验结果表明：膜渗透采样装置的本底及密闭性符合实验要求；聚合物膜表面氡析出达到稳定状态至少需要18 d；PVC膜的氡渗透系数最低。