By Richard E. Wainerdi (Eds.)
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2. To search for samples of very old lunar rocks. 3. To obtain samples that give a record of cosmic-ray history. 4. To date the age of the Copernican event and its widespread effect on the lunar surface. COMPOSITION AND HISTORY OF THE SOLAR SYSTEM 31 5. To obtain samples showing the effects of recent erosion and mixing processes. 6. To obtain samples displaying shock metamorphic effects. 7. To verify the mineralogy and petrology of the central hills, including a possible dike. As a specific example of the need for such a tool (whether mass spec, or other) the working group cited the need for a means of measuring Rb/Sr ratios in samples collected for age determination analyses: It is quite important that instruments be developed which will permit the astronaut to select samples having a sufficiently high Rb/Sr ratio or Κ concentration to maximize the probability that at least some samples will be suitable for dating.
HERZOG Measurement of escape rates One compensation of having to perform the atmosphere analysis following a contamination event is that the dumping of a load of exhaust on the Moon can be made into an experiment to determine escape rates. The data obtained would be most useful when coordinated with analyses performed at later dates, during a period during which there had been no new contamination. Escape rates could be determined most unequivocally by contaminating the atmosphere with gases that are not present naturally.
FBy NASA Lunar Atmosphere Working Group, Santa Cruz. August 1967. escape lifetimes should be thought of as upper limits which may actually be too high by many orders of magnitude for heavy species. T. Gold states that the interplanetary magnetic field is sufficiently strong to eject any ions formed in the Moon's exosphere permanently, so that the residence time of any gas in the lunar atmosphere is just the time required for it to become ionized, which he estimates as less than one month (mean life) in all cases.