Helium in old porcelain: The historical variation of the He isotopic composition in air
Helium in old porcelain: The historical variation of the He isotopic composition in air
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旧瓷器中的氦：空气中氦同位素组成的历史变化
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Akihisa Suzuki
中科院分区：
文献类型：
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作者：
J. Matsuda;Takuya Matsumoto;Akihisa Suzuki
在现代，大气中He-3/He-4比值是否由于化石燃料中含有的放射性He-4的人为释放而发生变化，这一问题仍存在争议。我们测量了古代中国和日本瓷器的He同位素比率，假设古代大气可能被保存在囊泡中。捕获的稀有气体是元素而不是同位素分馏的。一些古代中国瓷器的He-3/He-4比率明显高于现在的空气值。结果表明，近200年来大气氦-3/氦-4比值的变化率为- 0.034 +/- 0.018 %/年（2 sigma）。结果表明，在历史时期，瓷器可以作为古大气的时间胶囊
It is still debated whether there is a variation of the atmospheric He-3/He-4 ratio due to the anthropogenic release of radlogenic He-4 contained in fossil fuels, in modern era In this study, we measured the He isotopic ratios in old Chinese and Japanese porcelains assuming that the old atmosphere might have been preserved in vesicles The trapped noble gases are elementally but not isotopically fractionated The He-3/He-4 ratios in some old Chinese porcelain are significantly higher than the present air value, indicating that recent human industrial activity might have affected the helium isotopic ratio of the atmosphere Our result indicates that the rate of change in the atmospheric He-3/He-4 ratio was -0 034 +/- 0 018 %/year (2 sigma) in the last 200 years Results show that porcelain can be used as a time capsule of the paleoatmosphere during historical age