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Science 21 June 1968:
Vol. 160. no. 3834, pp. 1348 - 1349
DOI: 10.1126/science.160.3834.1348
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Articles

Aluminum-26 and Beryllium-10 in Marine Sediment

S. Tanaka 1, K. Sakamoto 1, J. Takagi 1, and M. Tsuchimoto 1

1 Institute for Nuclear Study, University of Tokyo, Tanashi, Tokyo, Japan

Activities of aluminum-26 and beryllium-10 in marine sediment were measured at 0.01 ± 0.13 and 4.4 ± 0.9 disintegrations per minute, per kilogram dry weight, respectively. Only an upper limit of 0.03 could be determined for the ratio of aluminum-26 to beryllium-10 in the sediment. The ratio is probably explained by production by cosmic rays in the atmosphere.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Cosmic-Ray Record in Solar System Matter.
R. C. Reedy, R. C. Reedy, J. R. Arnold, and D. Lal (1983)
Science 219, 127-135
   Abstract »    PDF »
Aluminum-26 in Deep-Sea Sediment.
J. L. Reyss, J. L. REYSS, Y. YOKOYAMA, and S. TANAKA (1976)
Science 193, 1119-1121
   Abstract »    PDF »
Alpha Particles in Solar Cosmic Rays over the Last 80,000 Years.
L. J. Lanzerotti, R. C. Reedy, and J. R. Arnold (1973)
Science 179, 1232-1234
   Abstract »    PDF »


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