| 摘要 |
PROBLEM TO BE SOLVED: To measure gas permeability, without being affected by the presence of gases which are abundant in the natural world. SOLUTION: A low-pressure chamber 135 of a transmission cell 110, separated by a test piece 100, is evacuated, and an isotope gas<SP>17</SP>O<SB>2</SB>, having a mass number different from measured oxygen<SP>16</SP>O<SB>2</SB>, and hardly existing in the natural world and having an identical chemical properties is introduced into a high-pressure chamber 140. The isotope gas<SP>17</SP>O<SB>2</SB>, passing through the test piece 100, is detected by a detector 160 comprising a mass spectrometer. The permeability of oxygen<SP>16</SP>O<SB>2</SB>to be measured is measured. There is no influence by the oxygen<SP>16</SP>O<SB>2</SB>remaining in the transmission cell 110 and adsorbed to the test piece 100. COPYRIGHT: (C)2004,JPO&NCIPI
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