A method of measuring the tritium in seawater based on electrolytic enrichment and ultra-low background liquid scintillation counting techniques was established. The different factors influencing the detection limit were studied, including the counting time, the electrolytic volume of the seawater samples, the selection of background water, scintillation solution and their ratio. After optimizing the parameters and electrolyzing 350 mL volume of samples, the detection limit of the method was as low as 0.10 Bq/L. In order to test the optimization of system for this method, of the 84 seawater samples collected from the Arctic Ocean we measured, 92% were above the detection limit (the activity of this samples ranged from 0.10 Bq/L to 1.44 Bq/L with an average of (0.30±0.24) Bq/L). In future research, if we need to accurately measure the tritium activity in samples, the volume of the electrolytic samples will be increased to further reduce the minimum detectable activity.

建立了一种基于电解富集和超低背景液体闪烁计数技术的海水中measuring的测定方法。研究了影响检测限的不同因素，包括计数时间，海水样品的电解量，背景水的选择，闪烁溶液及其比例。优化参数并电解350 mL样品后，该方法的检出限低至0.10 Bq / L。为了测试该方法的系统优化，在我们测量的北冰洋采集的84个海水样品中，有92％高于检测限（该样品的活性范围为0.10 Bq / L至1.44 Bq / L，平均（0.30±0.24）Bq / L）。在以后的研究中，