| Abstract: | The activity of (26)A1 in a North Pacific core was found to be 0.081 +/- 0.046 disintegration per minute per kilogram of dry sediment, which corresponds to a (26)A1/(10)Be ratio of 0.018 +/- 0.011 (or 0.019 +/- 0.012 when this ratio is corrected for decay). This ratio is in good agreement with that measured in Greenland ice, 0.017 +/- 0.008. These ratios are also in agreement with the calculated values for the production of these isotopes by cosmic rays in the atmosphere: 0.013 +/- 0.006. The contribution of cosmic dust bearing (26)Al seems small in comparison with the production of this nuclide in the atmosphere. |
