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首页> 外文会议>International Cryogenic Materials Conference >The Effect of the Variability in the Isotopic Composition of Gases on Top-Accuracy Cryogenic Temperature Standards and Remedies
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The Effect of the Variability in the Isotopic Composition of Gases on Top-Accuracy Cryogenic Temperature Standards and Remedies

机译：气体同位素组成中变异性对顶级低温低温标准和补救措施的影响

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摘要

In the cryogenic range, temperature standards are based on the measurement of phase transitions of substances that are gaseous at room temperature. For total uncertainty budgets today approaching, for the most accurate realizations, 50 μK, the effect of different isotopic compositions in the samples measured can become so large as to be the leading component of the total uncertainty budget.The variability of the isotopic composition is a well-known issue and is regularly monitored and reviewed by bodies such as the IUPAC. However, these data cover the whole spectrum of the variability observed on the earth. The actual variability that can be observed when buying commercial substances could be smaller to such an extent to alleviate or eliminate the practical problem, or could instead remain relevant. Only recently attention has been paid to the latter problem and the results were partially unexpected. This paper briefly reviews the modern analytical and thermal techniques, the resulting present knowledge and problems, and some recent solutions.
机译：在低温范围内，温度标准基于在室温下为气态的物质的相变的测量。对于今天的总不确定性预算接近，对于最准确的实现，50μk，测量的样品中不同同位素组合物的效果可能变得如此大，因为是总不确定性预算的领先组成部分。同位素组成的可变性是a众所周知的问题，经常被Iupac等机构监督和审查和审查。然而，这些数据涵盖了地球上观察到的变异性的整个频谱。购买商业物质时可以观察到的实际变化可能更小，以减轻或消除实际问题，或者可以保持相关性。只有最近关注后者的问题，结果是部分意外的。本文简要介绍了现代的分析和热技术，由此产生了现有的知识和问题，以及最近的解决方案。

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