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NMR polarization monitoring coils, hyperpolarizers with same, and methods for determining the polarization level of accumulated hyperpolarized noble gases during production

  • US 6,430,960 B1
  • Filed: 08/23/2001
  • Issued: 08/13/2002
  • Est. Priority Date: 06/30/1999
  • Status: Expired due to Fees
First Claim
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1. A method for releasing the post-thaw cryogenically accumulated hyperpolarized gas from a cold finger collection container operably associated with exit flow path plumbing, comprising the steps of:

  • cryogenically accumulating a quantity of hyperpolarized gas as a frozen sample in a cold finger;

    monitoring a pressure associated with the cryogenically collected hyperpolarized gas sample held in the cold finger;

    thawing at least a portion of the quantity of frozen hyperpolarized gas sample in the cold finger;

    increasing the pressure in the cold finger, thereby facilitating the phase transition of the hyperpolarized gas from a substantially frozen sample into a thawed fluid sample; and

    releasing the thawed fluid hyperpolarized sample as a gas from the cold finger responsive to when the hyperpolarized sample achieves a predetermined pressure based on the pressure determined during said monitoring step.

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