The proportion of krypton and xenon in dry air has been measured by a method using distillation and low-temperature gas-chromatography for the isolation of krypton and xenon. The separation has been controlled by the use of radioactive 85Kr tracer. The krypton content of dry air is 1⋅139 ± 0⋅01 x 10-6 by volume. The xenon content of dry air is 0⋅086 ± 0⋅001 x 10-6 by volume.
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Glueckauf et al. (1956) studied this question.
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