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Application of a liquid scintillation system with 100-ml counting vials for environmental tritium determination: Procedure optimization, performance test, and uncertainty analysis
Journal of Environmental Radioactivity ( IF 2.3 ) Pub Date : 2020-09-25 , DOI: 10.1016/j.jenvrad.2020.106427
Bin Feng , Bo Chen , Chao Zhao , Linfeng He , Fangdong Tang , Weihai Zhuo

For more efficient and accurate determination of airborne tritium in the environment, the procedure optimization, performance test and uncertainty analysis of a commercially available low-background liquid scintillation counting (LSC) system with 100-ml counting vials were studied in this work. The results showed that 50 ml water sample mixed with 50 ml scintillation cocktail (Ultima Gold uLLT, PE) could achieve the optimal counting condition after a dark adaption time longer than 1440 min. The minimum detectable activity (MDA) of the 100-ml vial system was estimated to be 0.18 Bq·L−1 in a continuous counting time of 3600 min, which was approximately 3.5 times lower than that of 20-ml vial system, and its determination uncertainty was also generally lower provided the collected samples was more than 15 ml. It indicates that the LSC system with 100-ml counting vials is preferable for environmental tritium determination. However, for more accurate determination, the electrolytic enrichment is still needed for the sample with the specific activity lower than 0.4 Bq·L−1. On the other hand, considering the cost and potential environmental impact of present available cocktails, the system with 20-ml vials is recommended for determining the sample with the specific activity higher than 2 Bq·L−1.



中文翻译:

带有100毫升计数瓶的液体闪烁系统在环境environmental测定中的应用:程序优化,性能测试和不确定性分析

为了更有效,更准确地确定环境中的空气中tri,本工作研究了带有100 ml计数瓶的市售低本底液体闪烁计数(LSC)系统的程序优化,性能测试和不确定性分析。结果表明,在暗适应时间超过1440分钟后,将50 ml水样品与50 ml闪烁鸡尾酒(Ultima Gold uLLT,PE)混合可以达到最佳计数条件。100 ml样品瓶系统的最小可检测活性(MDA)估计为0.18 Bq·L -1连续计数时间为3600分钟,比20毫升样品瓶系统的计数时间低约3.5倍,并且如果收集的样品超过15毫升,其测定不确定度通常也较低。这表明具有100 ml计数瓶的LSC系统更适合于环境preferable的测定。然而,为了更准确地确定,比活度低于0.4 Bq·L -1的样品仍需要电解富集。另一方面,考虑到现有鸡尾酒的成本和对环境的潜在影响,建议使用装有20 ml小瓶的系统确定比活度高于2 Bq·L -1的样品。

更新日期:2020-09-25
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