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The use of a quenching gas, isobutene, with a low vapor pressure was investigated to enhance the utility of hyperpolarized 129Xe (HP Xe) MRI. Xenon mixed with isobutene was hyperpolarized using a home‐built apparatus for continuously producing HP Xe. The isobutene was then readily liquefied and separated almost totally by continuous condensation at about 173 K, because the vapor pressure of isobutene...
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