Computer Science
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979e%26psl..42..379s&link_type=abstract
Earth and Planetary Science Letters, vol. 42, no. 3, Mar. 1979, p. 379-382.
Computer Science
Chemical Composition, Isotopes, Ocean Bottom, Sediments, Spherules, Calcium Isotopes, Cosmic Rays, Potassium Isotopes
Scientific paper
Isotopic compositions of potassium and calcium in individual magnetic spherules were determined. No significant anomaly was observed for potassium within twice the statistical error (2 sigmas), although for calcium isotopes enrichments of Ca-46, Ca-44, and Ca-42 were observed in one spherule. The relative excess of Ca-46, Ca-44, and Ca-42 in the spherule agrees with the relative yield of spallogenic calcium isotopes observed in iron meteorites. This fact indicates that the enrichment in the calcium isotopes was caused by cosmic-ray irradiation of the spherule in outer space.
Arai O.
Kobayashi Koji
Nogami Ken'ichi
Shimamura Tadashi
Tazawa Yuji
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