Volcanic EruptionsIsotopesIsotope LabelingNitrogen IsotopesOxygen IsotopesCarbon IsotopesArgonZinc IsotopesSulfur IsotopesDeuteriumIron IsotopesAtmospheric PressureHigh Pressure Neurological SyndromeNoble GasesInert Gas NarcosisPlasma GasesStrontium IsotopesIndicator Dilution TechniquesAir PressureKryptonLung Volume MeasurementsRadioisotope Dilution TechniqueOxygenNitrogenPolyvinyl ChlorideGasesPneumoperitoneum, ArtificialNeonCarbon DioxideMass SpectrometryBiolisticsAirGas Chromatography-Mass Spectrometry