Calibration of tritium enrichment factor in solid-polymer electrolyte device based on correlation between deuterium and tritium

被引：0

作者：

Wang C. ^{[1
,2
]}

Xue X. ^{[1
]}

Liu J. ^{[3
]}

Zeng Y. ^{[1
]}

Deng K. ^{[1
]}

Zhang Q. ^{[1
]}

Zhu L. ^{[1
]}

Liu W. ^{[1
,2
]}

Ge L. ^{[4
]}

机构：

[1] Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai

[2] University of Chinese Academy of Sciences, Beijing

[3] Shanghai Institute of Measurement and Testing Technology, Shanghai

[4] Shanghai Radiation Environmental Safety Technology Center, Shanghai

来源：

He Jishu/Nuclear Techniques | 2024年 / 47卷 / 04期

关键词：

Deuterium; Separation factor; Solid-polymer electrolyte water electrolysis; Tritium; Tritium enrichment factor; Tritium recovery factor;

D O I：

10.11889/j.0253-3219.2024.hjs.47.040404

中图分类号：

学科分类号：

摘要：

[Background] Solid-polymer electrolyte (SPE) water electrolysis has been widely used to concentrate low-level environmental tritium for measurements. It has the advantages of electrolyte elimination, infinite reduction ratio, high current, safety, and environmental friendliness. However, the use of high-activity tritium samples for the calibration of its tritium enrichment factor Et causes a tritium memory effect in the system. [Purpose] This study aims to reduce the tritium contamination caused by high-activity tritium samples during calibration. [Methods] First, the deuterium method (DM) was used to calibrate the prepared SPE-based tritium enrichment system. The strong correlation between the tritium-to-protium (β) and deuterium-to-protium separation factors (α) during the electrolysis was determined to obtain the electrolytic cell constant, k = α(β − 1)/(β(α − 1)). Then, based on the deuterium enrichment factor Ed, the tritium enrichment factor (Ed)k of the SPE-based tritium enrichment system was determined. Finally, the influence factors of the k-value were analyzed, and the tritium enrichment factors derived via low-level tritium measurements using the DM and spike-proxy method (SPM) were compared. [Results] The value of k is approximately 1.088 9, with a slight variation of 0.89% among cells. The k-value depends on the electrode material, but it is almost independent of the initial volume of water. [Conclusions] The k-value can be used as a constant for calibration of the tritium enrichment factor for the same types of electrolyzer with high accuracy and precision. © 2024 Science Press. All rights reserved.

引用

共 22 条

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