Abstract
THE determinations of the radioactivity of a series of ferro-manganese concretions of the seas and lakes of the U.S.S.R.1 (especially of the Kara Sea2 and lakes of Karelia3) have brought out certain facts (the surface layer is more active than the central part, the want or insignificant contents of Th X-MsTh) which make possible the determination of the age of the concretions by the content of radium in its different layers.
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References
L. M. Kurbatov, NATURE, 136, 871, Nov. 30, 1935.
L. M. Kurbatov, ” Radioactivity of Ferro-Manganese Formations of Kara Sea” (in preparation).
L. M. Kurbatov, ibid.
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KURBATOV, L. Age of Ferro-Manganese Concretions. Nature 137, 949–950 (1936). https://doi.org/10.1038/137949b0
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DOI: https://doi.org/10.1038/137949b0
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