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ESTIMATE OF RADIOGENIC He4 AND Ar40 CONCENTRATION IN THE CYTHEREAN ATMOSPHERE,
LOCKHEED MISSILES AND SPACE CO PALO ALTO CALIF LOCKHEED RESEARCH LAB
Pagination or Media Count:
Mixing ratios for He4 and Ar40 in a 100 Co2 Mariner 5 model of the Cytherean lower atmosphere are derived by assuming that the He4 and Ar40 are secondary in origin and result entirely from radioactive disintegration with subsequent outgassing from the planet. Production rates on Venus are assumed equal to those for the earth. Thermal escape of He4 is shown to be negligible, and other loss mechanisms are assumed unimportant. Concentration of these gases in the upper atmosphere of Venus are calculated from the mixing ratios and a turbopause at 6180 km radius. Author
APPROVED FOR PUBLIC RELEASE