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本文对液闪法测氚探测限的影响因子进行了识别、筛选和定量分析,结合电解浓缩方法,提出了降低分析方法探测限的优化方案,并通过实验设计,对上述影响因子逐一进行了验证。实验结果表明,通过恰当选择测量道宽、本底水、闪烁瓶材质、闪烁液及其与样品配比可以在不增加工作量的前提下将探测限降低至0.87 Bq/L;增加电解浓缩的预处理步骤能够大幅降低分析方法的探测限,进一步将其优化至38.5 m Bq/L。
In this paper, the influencing factors of tritium detection limit by liquid-flash method were identified, screened and quantitatively analyzed, and the optimal solution to reduce the detection limit of the analytical method was proposed by combining with the electrolytic concentration method. The above factors were validated one by one by experimental design . The experimental results show that the detection limit can be reduced to 0.87 Bq / L without any additional workload through proper choice of measuring width, background water, scintillation vial material, scintillation fluid and the ratio of the sample to the sample; The pretreatment step drastically reduces the detection limit of the analytical method and further optimizes it to 38.5 mBq / L.