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HP-Xe to go: storage and transportation of hyperpolarized 129Xenon

Recently the spin-lattice relaxation time T1 of hyperpolarized (HP)-129Xe was significantly improved by using uncoated and Rb-free storage vessels of GE180 glass. For these cells, a simple procedure was established to obtain reproducible wall relaxation times of about 18h. Then the limiting relaxati...

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Bibliographic Details
Main Authors: Repetto, Maricel Teresa (Author) , Allmendinger, Fabian (Author) , Schmidt, Ulrich (Author)
Format: Article (Journal)
Language:English
Published: 22 February 2016
In: Journal of magnetic resonance
Year: 2016, Volume: 265, Pages: 197-199
ISSN:1096-0856
DOI:10.1016/j.jmr.2016.02.011
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.jmr.2016.02.011
Verlag, lizenzpflichtig, Volltext: http://www.sciencedirect.com/science/article/pii/S1090780716001142
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Author Notes:M. Repetto, S. Zimmer, F. Allmendinger, P. Blümler, M. Doll, J.O. Grasdijk, W. Heil, K. Jungmann, S. Karpuk, H.-J. Krause, A. Offenhäusser, U. Schmidt, Y. Sobolev, L. Willmann
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Summary:Recently the spin-lattice relaxation time T1 of hyperpolarized (HP)-129Xe was significantly improved by using uncoated and Rb-free storage vessels of GE180 glass. For these cells, a simple procedure was established to obtain reproducible wall relaxation times of about 18h. Then the limiting relaxation mechanism in pure Xe is due to the coupling between the nuclear spins and the angular momentum of the Xe-Xe van-der-Waals-molecules. This mechanism can be significantly reduced by using different buffer gases of which CO2 was discovered to be the most efficient so far. From these values, it was estimated that for a 1:1 mixture of HP-Xe with CO2 a longitudinal relaxation time of about 7h can be expected, sufficient to transport HP-Xe from a production to a remote application site. This prediction was verified for such a mixture at a total pressure of about 1bar in a 10cm glass cell showing a storage time of T1≈9h (for T1wall=(34±9)h) which was transported inside a magnetic box over a distance of about 200km by car.
Item Description:Die Zahl 129 ist im Titel hochgestellt
Gesehen am 22.10.2021
Physical Description:Online Resource
ISSN:1096-0856
DOI:10.1016/j.jmr.2016.02.011

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