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The following list covers measurements of bomb-produced C 14 in series of cereals and grasses collected on the northern hemisphere from 1956 through 1966. Samples were measured in order to determine the yearly addition of bomb produced C 14 at a single locality, and to detect possible geographic variations in the distribution and uptake of bomb-generated C 14 in terrestrial plant material during years with greatly varying additions of bomb C 14 . Measurements are given in the ∆ scale (Lamont VIII), i.e. per mil deviations from 0.95 times the activity of the NBS oxalic-acid standard (the natural C 14 level).
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Henrik Tauber (1967) studied this question.
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