Accurate measurement of individual short-lived radon progeny concentrations is very important for dose evaluation and related researches taking radon progeny as radioactive tracers. Different methods have been developed, but higher methodological sensitivity is needed for field measurement under the limitation of size, weight and power consumption of the instrument. For the purpose of developing new measurement method with higher sensitivity, an optimized method based on alpha spectrometry following the Wicke method (Wicke, 1979) is demonstrated, which shortens the measurement cycle to 60 min and make it more suitable for field measurement. For comparison, a series of verification experiments were carried out, and the methodological sensitivity and uncertainty were analyzed in detail in this paper. Results show that the optimized Wicke method can give accurate individual radon progeny concentrations and equilibrium equivalent concentration (EEC) in different environments. The deviation between EEC measured by the optimized Wicke method and the original Wicke method is less than ±2.9%, and the deviation between the optimized Wicke method and the Kerr method is less than ±3.9% in different environment. The methodological sensitivity of the optimized Wicke method is nearly the same as the original method with a much shorter measurement cycle, and 4.3 times higher than that of the Kerr method, which lowers the measurement uncertainty especially in the actual environment.

以dose子后代为放射性示踪剂，准确测定单个short子后代的浓度对于剂量评估和相关研究非常重要。已经开发出不同的方法，但是在仪器的尺寸，重量和功耗的限制下，现场测量需要更高的方法灵敏度。为了开发具有更高灵敏度的新测量方法，展示了一种基于Wicke方法（Wicke，1979年）的基于Alpha光谱法的优化方法，该方法将测量周期缩短至60分钟，使其更适合于现场测量。为了进行比较，进行了一系列验证实验，并对方法的敏感性和不确定性进行了详细分析。结果表明，优化的Wicke方法可以在不同环境中给出准确的individual浓度和平衡当量浓度（EEC）。通过优化的Wicke方法测得的EEC与原始Wicke方法之间的偏差小于±2.9％，并且在不同的环境中，优化的Wicke方法与Kerr方法之间的偏差小于±3.9％。优化的Wicke方法的方法敏感性与原始方法几乎相同，测量周期更短，并且比Kerr方法的灵敏度高4.3倍，从而降低了测量不确定性，尤其是在实际环境中。通过优化的Wicke方法测得的EEC与原始Wicke方法之间的偏差小于±2.9％，并且在不同的环境中，优化的Wicke方法与Kerr方法之间的偏差小于±3.9％。优化的Wicke方法的方法敏感性与原始方法几乎相同，测量周期更短，并且比Kerr方法的灵敏度高4.3倍，从而降低了测量不确定性，尤其是在实际环境中。通过优化的Wicke方法测得的EEC与原始Wicke方法之间的偏差小于±2.9％，并且在不同的环境中，优化的Wicke方法与Kerr方法之间的偏差小于±3.9％。优化的Wicke方法的方法敏感性与原始方法几乎相同，测量周期更短，并且比Kerr方法的灵敏度高4.3倍，从而降低了测量不确定性，尤其是在实际环境中。