Beryllium-10 in australasian tektites: evidence for a sedimentary precursor.
Science
; 218(4574): 787-9, 1982 Nov 19.
Article
em En
| MEDLINE
| ID: mdl-17771035
ABSTRACT
Each of seven Australasian tektites contains about 1 x l0(8) atoms of beryllium-10 (half-life, 1.53 x 10(6) years) per gram. Cosmic-ray bombardment of the australites cannot have produced the measured amounts of beryllium-10 either at the earth's surface or in space. The beryllium-10 contents of these australites are consistent with a sedimentary precursor that adsorbed from precipitation beryllium-10 produced in the atmosphere. The sediments must have spent several thousand years at the earth's surface within a few million years of the tektite-producing event.
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Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
1982
Tipo de documento:
Article