The beryllium-10 concentration in deep-sea sediments

Goel, P. S. ; Kharkar, D. P. ; Lal, D. ; Narsappaya, N. ; Peters, B. ; Yatirajam, V. (1957) The beryllium-10 concentration in deep-sea sediments Deep Sea Research (1953), 4 . pp. 202-210. ISSN 0146-6313

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The cosmic-ray-produced radioactive isotope, 10Be (half-life 2.7 million years) has been discovered in the upper and lower portions of a 15 m long core from the sediment of the Pacific Ocean. A comparatively simple chemical procedure for its extraction has been developed. If the investigated core represents sedimentation which has remained physically and chemically undisturbed for several million years, the following tentative conclusions can be drawn: The measured concentrations of 10Be in layers at various depth indicate a sedimentation rate of about 5 mm/1,000 years which is not far from current estimates. The concentration in the upper layers leads to a present-day deposition rate of 2.55 × 101010Be nuclei/cm2 year, in excellent agreement with estimates based on the 7Be contents of rainwater. The decrease of concentration with depth indicates an intensity of cosmic rays in the past which has changed not at all or very slowly during the last ca. 2.5 million years.

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Source:Copyright of this article belongs to Elsevier Science.
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