Aluminum 26, ¹⁰Be, and ³⁶Cl depth profiles in the Canyon Diablo iron meteorite

Abstract

We have measured activities of the long‐lived cosmogenic radionuclides 26 Al, 10 Be, and 36 Cl in 12 fragments of the iron meteorite Canyon Diablo and have constructed production rate‐versus‐depth profiles of those radionuclides. Profiles determined using differential particle fluxes calculated with the LAHET code system are in good agreement with 26 Al, 10 Be, and 36 Cl experimental data, but the agreement for 36 Cl was obtained only after neutron‐induced cross sections were modified. Profiles calculated with lunar particle fluxes are much lower than experimental Canyon Diablo profiles. The cosmic ray exposure ages of most samples are near 540 m.y.