The half‐life of 26 Al has been redetermined because of suggestions of an error in the accepted value based on its use in calculating 21 Ne production rates from cosmic rays in meteorites. Two solutions of 26 Al were analyzed for the specific radioactivity and mass spectrometric determination of the 26 Al concentration. The half‐life obtained for 26 Al was 7.05×10 5 years ±3.4%. This is identical to the accepted value of 7.16×10 5 years and indicates that problems with the 21 Ne production rate is not due to an erroneous half‐life.
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Norris et al. (1983) studied this question.
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