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The threshold energy of the Mg(p, n) Al reaction has been measured to be 5209.46+0.12 keV, using a 1 V standard as reference, and taking account of efFects due to 6nite beam energy spread, nonuniform proton energy loss in the target, and ionization of the magnesium atoms. The Q value derived for the Al beta decay then becomes 4232.17+0.12 keV, which is in clear disagreement with the most precise of the existing measurements. A further measurement is proposed.PACS number(s): 21.10. Dr, 23.40.s, 27.30.+t, 24.80.Dc

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