Patent ID: 6598463
Filing Date: 2003-07-29
Classification: G01N

Abstract:
A method or the simultaneous determination of permeation rate of a gas or vapor permeant through and desorption rate of said permeant from a polymeric specimen, the method comprisingsealingly separating a first volume from a second volume with a test specimen suffused with a first isotope of a gas or vapor; introducing in said first volume a second isotope of said gas or vapor, said second isotope being detectably distinguishable from said first isotope; in said second volume, adjusting the partial pressure of both said isotopes of said gas or vapor to a negligible value compared to that of said second isotope of said gas or vapor in said first volume; providing said second volume with a means for conveying said gas or vapor diffusing thereinto to a detection means capable of quantitatively distinguishing between said first and said second isotopes of said gas or vapor; and, distinguishably detecting the concentration of each of said diffusing ant in said second volume.