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Al depth profile in Apollo 15 drill core |
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| Authors: | K. Nishiizumi J. Klein R. Middleton J.R. Arnold |
| Affiliation: | aDepartment of Chemistry, B-017, University of California at San Diego, La Jolla, CA 92093 U.S.A. bTandem Accelerator Laboratory, Department of Physics, University of Pennsylvania, Philadelphia, PA 19104 U.S.A. |
| Abstract: | Cosmic-ray-produced26Al (t1/2 = 7.05 × 105 years) has been measured in the Apollo 15 long core (surface to 390 g/cm2—218 cm) for study of galactic cosmic ray production profiles, using accelerator mass spectrometry. The results are in general accord with non-destructive counting data obtained earlier, but systematically lower, and significantly higher precision. From this experiment the half-attenuation length for26Al production can be calculated to be 122 g/cm2 (150–400 g/cm2 region) after normalizing the data to average chemical composition. The53Mn (t1/2 = 3.7 × 106 years) production profile in deep cores was also compiled to date. The half-attenuation length for53Mn production was calculated to be 123 g/cm2 (150–400 g/cm2 region). |
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