Abstract For low-level tritium measurements using a liquid scintillation counter, scintillation vial selection is important. The applicability of polyethylene (PE) vials was studied. Three types of vials were tested: (1) 100-mL perfluoroalkoxy alkane (PFA) fluorine resin vials, (2) 100-mL PE vials, and (3) 145-mL PE vials. Ultima Gold LLT was the reference liquid scintillator in this study. The background counts for these vials were found to be 2.5 counts per minute. Tritiated water of 1.5 Bq‧mL−1 was employed as an internal standard to determine the counting efficiency. The counting efficiencies for the 100-mL PFA, 100-mL PE, and 145-mL PE vials were estimated to be 17%, 16%, and 13%, respectively. The lower limits of detection of these vials for a counting time of 100 min were 1.45 Bq‧L−1 for 100-mL PFA vials, 1.54 Bq‧L−1 for 100-mL PE vials, and 1.47 Bq‧L−1 for 145-mL PE vials. Thus, these vials demonstrate similar performances for tritium measurements.

中文翻译：

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使用低本底液体闪烁计数器测量低浓度氚的 100 mL 聚乙烯样品瓶的适用性

摘要 对于使用液体闪烁计数器的低水平氚测量，闪烁小瓶的选择很重要。研究了聚乙烯 (PE) 小瓶的适用性。测试了三种类型的样品瓶：(1) 100-mL 全氟烷氧基烷烃 (PFA) 氟树脂样品瓶，(2) 100-mL PE 样品瓶，和 (3) 145-mL PE 样品瓶。Ultima Gold LLT 是本研究中的参考液体闪烁体。发现这些小瓶的背景计数为每分钟 2.5 个计数。用1.5 Bq‧mL-1氚化水作为内标测定计数效率。100 毫升 PFA、100 毫升 PE 和 145 毫升 PE 小瓶的计数效率估计分别为 17%、16% 和 13%。对于 100 分钟的计数时间，这些小瓶的检测下限为 1.45 Bq·L-1（100-mL PFA 小瓶），1.54 Bq·L-1（100-mL PE 小瓶），和 1.47 Bq‧L−1（用于 145-mL PE 小瓶）。因此，这些样品瓶在氚测量方面表现出类似的性能。