AMS, 26Al, stones of interest (OREX-800055-11 and (OREX-803228-0) and ~14 mg aliquot (OREX-800117-103) of homogenized aggregate sample.
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Accelerator mass spectrometry analysis of 26Al concentrations in small splits of two stones of interest (OREX-800055-0) and (OREX-800088-0) and a ~14 mg split of a homogenized bulk aggregate sample (OREX-800117-0) from Bennu. Each sample was dissolved in HF/HNO3 and a small aliquot of the dissolved sample was taken for chemical analysis by ICP-OES. The 26Al concentrations in the two SOIs are ~18 dpm/kg, compared to a 26Al concentration of ~21 dpm/kg in the aggregate sample. Combined with the 10Be data, these results constrain the cosmic-ray exposure age of the samples to at least a few Myr near the sufrace of asteroid Bennu.
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Welten, K., 2025. AMS, 26Al, stones of interest (OREX-800055-11 and (OREX-803228-0) and ~14 mg aliquot (OREX-800117-103) of homogenized aggregate sample., Version 1.0. Astromaterials Data Archive. https://doi.org/10.60707/k14q-h872 Accessed 2025-12-05.
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This material is supported by NASA under contract NNM10AA11C issued through the New Frontiers program. This study is supported by NASA grant 80NSSC22K1693 through the OREX-PSP.
