Measurements of the concentrations of Al-26 in lunar rocks 15555 and 60025
Abbreviated Journal Title
Earth Planet. Sci. Lett.
Keywords
Al-26; lunar samples; cosmic rays; models; solar wind; supernovas; INTERSTELLAR-MEDIUM; GEMINGA; SYSTEM; BE-10; SOLAR; Geochemistry & Geophysics
Abstract
The authors have measured the concentrations of Al-26 in lunar rock samples 15555,859 and 60025,28 with a multidimensional gamma-ray spectrometer, obtaining concentrations of 167 +/- 14 and 255 +/- 10 dpm/kg for the two rocks, respectively. Computer modelings were carried out on both samples of the 26Al production rates from cosmic-ray bombardment using consistent values of cosmic-ray parameters and reasonable values of surface erosion to see if an inconsistency in values needed for a fit between measurement and modeling could be found which would suggest the presence of surface-implanted Al-26 in one or both samples. The final result was that both of the samples could be fitted by the computer models using omnidirectional SEP flux and rigidity shape values of 125 protons/cm(2)/s > 10 MeV and 125 MV/unit charge, respectively, and with the reasonable surface erosion rates of 0-0.24 mm/Myr for rock 15555,859, and 1.6 mm/Myr for 60025,28. (C) 2001 Elsevier Science B.V. All rights reserved.
Journal Title
Earth and Planetary Science Letters
Volume
187
Issue/Number
1-2
Publication Date
1-1-2001
Document Type
Article
Language
English
First Page
163
Last Page
171
WOS Identifier
ISSN
0012-821X
Recommended Citation
"Measurements of the concentrations of Al-26 in lunar rocks 15555 and 60025" (2001). Faculty Bibliography 2000s. 2552.
https://stars.library.ucf.edu/facultybib2000/2552