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Abstract #2153

Continuous Cryogen-Free Up-Concentration of Hyperpolarized $$$^{129}$$$Xe Gas

Wolfgang Kilian1, Lorenz Mitschang1, Sergey Korchak1, and Jan Wind2

1Physikalisch-Technische Bundesanstalt (PTB), Berlin, Germany, 2Helmholtz-Zentrum Geesthacht, Geesthacht, Germany

A semipermeable membrane was utilized to separate the process gas helium from a continuous gas stream containing hyperpolarized $$$^{129}$$$Xe. By this the xenon partial pressure was increased by a factor of ten and the gross amount of helium was removed from the gas stream which was fed from the polarizer to a liquid probe within an NMR spectrometer. Using a sample of dissolved cryptophane-A cage allowed to separate the effects of up-concentration and polarization loss. The increase in xenon partial pressure was still a twofold higher than the polarization loss we have seen and improvements are obvious from the analysis.

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