It is calculated by subtracting dead space ventilations from total pulmonary ventilation quizlet11/15/2023 SEP-He (^4He/^3He = 4650 +-100) and SEP- Ar (^36 Ar/^38 Ar = 4.89+-0.05) are also observed (latter two numbers slightly revised compared to Wieler et al., 1992). The slope of this line indicates mass dependent fractionation between SW-Ne and SEP-Ne. The Ne data-points of later steps fall on a straight line and reach the SEP-Ne point (^20Ne/^22Ne = 11.3). The first two ratios are essentially identical to modern solar wind values (SWC Geiss, 1973), indicating an isotopically unfractionated SW noble gas reservoir in lunar ilmenite. He, Ne, Ar isotopes: We observe the familiar presence of two solar noble gas components: step 1 shows ^4He/^3He = 2250, ^20Ne/^22Ne = 13.8, and ^36 Ar/^38 Ar=5.46. We analyzed all five noble gases in an ilmenite sample from lunar soil 71501 by closed system stepped etching (CSSE), thus extending our CSSE studies of solar noble gases (Wieler et al., 1986 Benkert et al., 1988) to Kr and Xe. SEP- Kr and SEP- Xe in Lunar Ilmenite and the Ar/Kr/Xe Ratio in the Solar Wind
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