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3He/4He isotopic ratio measurements to below the 10^-12 level

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A miniature helium isotopic concentration cryostat is described. By means of this device, the 3He/4He ratio of a given sample of helium gas can be increased by a measurable factor of up to ca 400, thereby enhancing by the same factor the ultimate sensitivity of 3He/4He ratio determination by mass spectrometry.

Bibliographic note

Proceedings of the 17th International Conference on Low Temperature Physics, Karlsruhe, 15-22 August 1984.