液闪法测环境低水平氚的探测限影响因子研究

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 mBq/L。

Research on factors affecting detection limit of tritium with liquid scintillation counter

Factors that affect the detection limit of tritium measurement with liquid scintillation counter are identified, screened and analyzed quantitatively in this article. With adoption of electrolysis enrichment, an optimized solution to lowering detection limit is presented. Above influential factors are verified individually by well designed experiments. It shows that the detection limit could be reduced to 0.87 Bq/L by choosing counting channels, background water, material of vial, ratio of sample and cocktail adequately without increasing workload, and further to 38.5 mBq/L if electrolysis enrichment process is used.