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Science 21 July 1972:
Vol. 177. no. 4045, pp. 270 - 272
DOI: 10.1126/science.177.4045.270
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Articles

Coral Chronometers: Seasonal Growth Bands in Reef Corals

David W. Knutson 1, Robert W. Buddemeier 1, and Stephen V. Smith 2

1 Department of Chemistry and Hawaii Institute of Geophysics, University of Hawaii, Honolulu 96822
2 Department of Oceanography and Hawaii Institute of Geophysics, University of Hawaii

Autoradiagraphs and x-radiographs have been made of vertical sections through the centers of reef corals from Eniwetok. Radioactivity bands in the coral structure are caused by strontium-90 and are related to specific series of nuclear tests, thus making possible calculation of long-term growth rates. These data indicate that the cyclic variations in radial density revealed by x-radiography are annual.


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