Background: According to the national standard of “Analytical Determination of Radium-226 in Water (GB/T 11212-1989)”, emanation-scintillation is widely used to monitor the content of 226Ra in water. Purpose: This study aims to optimize the analysis and mensuration conditions of emanation-scintillation method recommended in GB/T 11212-1989. Methods: The related parameters for mensuration of 226Ra, such as recovery rate, measuring moment and measuring instrument were investigated to identify the optimal working state by a series of experimental tests. Results: If the percent recovery indicated pretreatment loss was introduced, the mensuration result would be more accurate. The optimal measuring moment was 3−4 h after the complete collection of the Radon from the samples. The traditional FD-125 radon-thorium analyzer can be replaced by the portable AB-5R radon monitor which will be more convenient and flexible while keep the same performance. Conclusion: The relevant recommendations provide alternative solution for field measurement of 226Ra in water, and a design reference for the developing and updating of the GB/T 11212-1989 standard in future.%从回收率、测量时刻和仪器选择等方面对《水中镭-226的分析测定》(GB/T 11214-1989)中规定的水中226Ra 分析方法的改进进行了探讨。结果表明，在实验中，采用一个能反映前处理中样品损失的回收率可以提高分析结果的准确度；最佳测量时刻为氡气进气完毕后的3−4 h；测量分析了用便携式 AB-5R 型测氡仪替代标准中要求的 FD-125型室内氡钍分析仪的多种样品测试指标，验证了替代的可行性，为现场快速检测和标准的后续更新提供一定的技术参考。
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