Short-Lived Cosmogenic Radionuclide Production in Lunar Rocks; Improved Estimates for the Solar Proton Flux in Recent Solar Cycles

Details Short-Lived Cosmogenic Radionuclide Production in Lunar Rocks; Improved Estimates for the Solar Proton Flux in Recent Solar Cycles Short-Lived Cosmogenic Radionuclide Production in Lunar Rocks; Improved Estimates for the Solar Proton Flux in Recent Solar Cycles

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1207s&link_type=abstract

Lunar and Planetary Science, volume 27, page 1207

Computer Science

4

Cosmogenic Nuclides: Production Rates, Nuclides: Cosmogenic, Rays: Cosmic, Rays: Solar Cosmic

Scientific paper

Radionuclides are produced in lunar rocks by cosmic rays bombarding the Moon. Solar cosmic rays (SCR) can only penetrate the top 1-2 cm of the Moon's surface, while galactic cosmic rays (GCR) can penetrate several meters. The cosmogenic radionuclide archive can be analyzed to give information about the solar proton fluxes incident on the Moon over the past 2-10 million years. It is important to understand any variation in the Sun's activity over an extended time period so that the radiation hazards that might be met in space missions can be correctly assessed. Reedy, in 1977, analyzed the lunar rocks returned by the Apollo missions for the short-lived radionuclide production and compared the results with contemporary measurements of the solar proton flux. Now that there are (1) many more direct measurements of the solar proton flux available, (2) additional depth profiles measured in lunar rocks, and (3) considerable progress in measuring the reaction cross sections needed as input to the theoretical models, new estimates for solar proton fluxes over solar cycles 19 and 20 have been made.

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