中文摘要：

本文介绍了一种同时测量混合^222Rn、^220Rn空气的单闪烁室方法，该方法利用一个闪烁室测量采样结束后两个不同时间段的计数，再联立一个二元方程组来求解。^222Rn、^220Rn浓度，因此也叫单闪烁室两段法，该方法无需任何延时即可快速准确测定混合环境下^222Rn、^220Rn浓度．

英文摘要：

A method has been developed for the simultaneous measurement of radon （222Rn） and thoron（220Rn） in a mixed environment using a scintillation cell in this paper. The method uses counts from two arbitrary counting intervals from zero time with respect to sampling, establishes two equations with two unknown variables to solve concentrations of radon and thoron, hence, called two-count method （TCM）. The method can be used to esti- mate the radon and thoron concentrations in a mixed environment accurately and quickly, as there is no need to delay the counting to achieve complete decay of thoron.