6533b85afe1ef96bd12ba057
RESEARCH PRODUCT
HP-Xe to go: Storage and Transportation of Hyperpolarized 129-Xe
M. RepettoKlaus-peter JungmannS. KarpukHans-joachim KrauseY. SobolevF. AllmendingerM. DollUlrich SchmidtWerner HeilPeter BlümlerLorenz WillmannAndreas OffenhäusserS. ZimmerJ.o. Grasdijksubject
CouplingNuclear and High Energy PhysicsAngular momentumSpinsCondensed matter physicsChemistryRelaxation (NMR)BiophysicsAnalytical chemistrychemistry.chemical_element010402 general chemistryCondensed Matter Physics01 natural sciencesBiochemistry0104 chemical sciencessymbols.namesakeXenon0103 physical sciencessymbolsvan der Waals forceTotal pressure010306 general physicsLongitudinal Relaxation Timedescription
Abstract Recently the spin–lattice relaxation time T 1 of hyperpolarized (HP)- 129 Xe 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 18 h. 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 CO 2 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 CO 2 a longitudinal relaxation time of about 7 h 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 1 bar in a 10 cm glass cell showing a storage time of T 1 ≈ 9 h (for T 1 wall = ( 34 ± 9 ) h) which was transported inside a magnetic box over a distance of about 200 km by car.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-02-22 |