Abstract
Cosmic-ray-produced 10Be ( t 1/2 = 1.6 × 10 6 years) and 36Cl ( t 1/2 = 3.0 × 10 5 years) have been measured in the Apollo 15 long core for study of galactic cosmic ray production profiles using tandem accelerator mass spectrometry. From these experiments, the half-attenuation length for 10Be production and 36Cl production were calculated to be 120 g/cm 2 and 132 g/cm 2 (150–400 g/cm 2 region). The measured half-attenuation length for 10Be is slightly longer than that predicted by the Reedy-Arnold theoretical model. The flatter and somewhat deeper maximum seen in the 36Cl profile compared to the 10Be, 26Al and 53Mn profiles can be explained by production from secondary thermal neutrons on 35Cl.
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