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Atmospheric Radiocarbon Activity in 1959


ATTENTION has already been directed to the appreciable rise in the atmospheric radiocarbon activity following the testing of nuclear weapons1–4. On the basis of data obtained up till 1958, Broecker and Walton1 estimated a rise in the atmospheric radiocarbon concentration in the northern hemisphere of 5 per cent per annum, though Münnich and Vogel2 had arrived at a rate of rise of 3.2 per cent per annum. Measurements made in the summer of 1959, however, indicate a general level of activity greatly in excess of what might have been expected from either of these estimations.

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  1. Broecker, W. S., and Walton, A., Science, 130, 309 (1959).

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  2. Münnich, K. O., and Vogel, J. C., Naturwiss., 14, 327 (1958).

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  3. de Vries, Hl., Science, 128, 250 (1958).

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  4. Rafter, T. A., and Ferguson, C. J., N.Z. J. Sci. and Tech., B, 38, 871 (1957).

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  5. Münnich, K. O., and Vogel, J. C., in Godwin, H., Nature, 184, 1365 (1959).

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WILLIS, E. Atmospheric Radiocarbon Activity in 1959. Nature 185, 552–553 (1960).

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