At present, the continuous radon monitor based on the electrostatic collection method has been widely used. The collection efficiency of the positively charged radon progeny in the electrostatic field of the measurement cell related to the OH- ions concentration of water vapor molecules. Using the analytical expression of e-quilibrium ion content of water vapor in air from literature, we obtain the analytic expression of 218Po collection efficiency related the temperature and humidity from kinetic theory. Thus, multiple measurements can be used to improve the accuracy of four parameters C, g,λand σ. The accuracy of the collection efficiency related the temperature and humidity curves can be improve and the experimental workload will be reduced. At the same time, a novel method for measuring the recombination probability of a positively charged 218Po and the OH "ion.%当前,基于静电收集法的连续测氡仪得到了广泛应用.静电场对带正电的氡子体的收集效率与测量室内空气中水蒸气分子电离的OH-离子浓度有关.从分子运动论出发,利用相关文献给出的空气中水蒸气的OH-离子浓度的解析表达式,得到了218Po收集效率的温、湿度曲线的解析表达式.这样就可以利用多次测量提高C、g、λ、σ这四个常数的精度,从而提高收集效率的温、湿度曲线的准确性,并且可以减少实验测量工作量.同时得到了一种带正电218Po与OH-离子复合概率的测量方法.
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