D2气体与重水中氚含量的测定
Determination of Tritium Content in D2 Gas and Heavy Water
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中文总结 AI 辅助
本研究建立了一种基于钯/铂催化剂反应与Revvity Quantulus GCT 6220分析的飞摩尔级氚含量测定方法，可检测D2气体和重水中的氚，证实常见D2样品含超天然丰度的氚，强调基线氚测量对核聚变实验结果有效性的重要性。
中文摘要 AI 辅助
本文描述了一种用于测定天然氢气和氘气中氚浓度的简单实验方法，该方法可检测低至飞摩尔级别的氚。研究使用钯（Pd）和铂（Pt）催化剂使氢气与氧气反应生成水，随后采用Revvity Quantulus GCT 6220对生成的水进行分析，该分析方法对氢气或重水中的氚可达到亚飞摩尔级别的检测限。对所分析的D2气体样品，测得其氚污染水平约为1飞摩尔/标准升（SL）；对所分析的标准氢气样品，测得其氚污染水平约为0.025飞摩尔/SL，该值低于Quantulus的噪声水平。钯或铂催化剂的选择对最终氚测量结果无显著影响。通过证实常见D2样品可被微量氚污染，且其含量比天然丰度高出数个数量级，该测试表明，对氘样品进行基线氚测量对于确定核聚变产额实验结果的有效性极为重要。
英文摘要
A simple experimental method for the determination of tritium concentration in natural hydrogen and deuterium gas down to the femtomole level is described. Palladium and platinum catalysts were used to react hydrogen and oxygen, creating water that could be analyzed in a Revvity Quantulus GCT 6220. This analysis produced sub-femtomole detection limits of tritium present in hydrogen gas or heavy water. A contamination level of $\sim 1\text{ femtomole/SL}$ was found in the $\text{D}_2$ gas sample that was analyzed. A contamination level of $\sim 0.025\text{ femtomole/SL}$, which is below the noise level of the Quantulus, was found in the standard hydrogen gas sample that was analyzed. The choice of palladium or platinum catalyst did not significantly affect the resulting tritium measurement. By showing that common $\text{D}_2$ samples can be contaminated with trace amounts of tritium orders of magnitude above natural abundance, this test demonstrates that a baseline tritium measurement for deuterium samples is highly important for determining the validity of results in nuclear fusion yield experiments.
