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首页> 外文期刊>Applied Geochemistry: Journal of the International Association of Geochemistry and Cosmochemistry >New determination of the He-3 mixing ratio in the Earth's lower atmosphere from an international tritium intercomparison exercise
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New determination of the He-3 mixing ratio in the Earth's lower atmosphere from an international tritium intercomparison exercise

机译：新的国际氚离法练习中地球较低气氛中HE-3混合比的新测定

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摘要

The light isotope of helium, He-3, is essentially a primordial substance entrapped within the Earth's interior during the formation of the planet. It is released into the atmosphere by volcanic/magmatic activity, and eventually escapes to outer space. He-3 is also produced by the radioactive beta-decay of tritium. Hence, measurements of He-3 can be used to derive the concentration of tritium. The so-called "He-3 ingrowth" method uses a mass spectrometer to detect the amount of He-3 that accumulates in a sample during a given period of storage. The He-3 measurements are classically calibrated against an air standard. The method thus relies on the accurate knowledge of the atmospheric mixing ratio of He-3. This value is based on mass spectrometric measurements with gravimetrically or volumetrically prepared He-3 standard mixtures. Here, we apply the He-3 ingrowth method in reverse, using a solution of tritiated water prepared for an international comparison of tritium activity measurements to precisely determine the He-3 mixing ratio of our air standard. The measured atmospheric mixing ratio of He-3, based on a series of ten measurements, is [He-3] = 7.12 +/- 0.06 ppt. This value is between 1% and 2% lower than previous determinations reported in the literature. However, all results remain statistically consistent.
机译：He-3的氦的光同位素基本上是在地球形成过程中捕获地球内部内的原始物质。它通过火山/岩浆活动释放到大气中，并最终逃到外太空。 He-3也由氚的放射性β-腐烂产生。因此，HE-3的测量可用于导出氚的浓度。所谓的“He-3 Negrowth”方法使用质谱仪检测在给定的储存期间在样品中累积的HE-3的量。 HE-3测量率先校准空气标准。因此，该方法依赖于对He-3的大气混合比的准确了解。该值基于具有热分析或体积准备的HE-3标准混合物的质谱测量。在这里，我们使用制备的氚化水的溶液应用于氚化水分测量的国际比较来逆转，以精确地确定我们的空气标准的HE-3混合比。基于一系列10次测量的He-3的测量的大气混合比是[He-3] = 7.12 +/- 0.06 ppt。该值低于文献中报告的先前测定的1％和2％。但是，所有结果都保持统计学上一致。

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