Determination of the half-life of Ca-41 from measurements of Antarctic meteorites
Accelerator mass spectrometry is utilized to determine the half-life of Ca-41 from the decrease of its concentration with terrestrial age in five Antarctic meteorites and a recent fall. The meteorites were selected on the basis of their Cl-36 concentrations, which showed a span of terrestrial ages o...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19910055023 2023-05-15T13:53:23+02:00 Determination of the half-life of Ca-41 from measurements of Antarctic meteorites Klein, Jeffrey Fink, David Middleton, Roy Nishiizumi, Kunihiko Arnold, James Unclassified, Unlimited, Publicly available Apr 1, 1991 http://ntrs.nasa.gov/search.jsp?R=19910055023 unknown http://ntrs.nasa.gov/search.jsp?R=19910055023 Accession ID: 91A39646 Copyright Other Sources 91 Earth and Planetary Science Letters; 103; 1-4,; 79-83 1991 ftnasantrs 2012-02-15T19:02:21Z Accelerator mass spectrometry is utilized to determine the half-life of Ca-41 from the decrease of its concentration with terrestrial age in five Antarctic meteorites and a recent fall. The meteorites were selected on the basis of their Cl-36 concentrations, which showed a span of terrestrial ages of about 600 ka, and on the basis of other cosmogenic nuclide concentrations which indicated that the meteorites had small preatmospheric sizes, and sufficiently long irradiation times in space that the concentrations of Ca-41 and Cl-36 were in secular equilibrium prior to the meteorites' fall to earth. The half-life of Ca-41 is determined at 103 + or - 7 ka. Topics discussed include the effects of undersaturation (short exposure time in space), shielding (the samples are from the interior of a large meteorite), and weathering on the cosmogenic nuclide concentrations in meteorites. Other/Unknown Material Antarc* Antarctic NASA Technical Reports Server (NTRS) Antarctic |
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NASA Technical Reports Server (NTRS) |
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unknown |
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91 |
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91 Klein, Jeffrey Fink, David Middleton, Roy Nishiizumi, Kunihiko Arnold, James Determination of the half-life of Ca-41 from measurements of Antarctic meteorites |
topic_facet |
91 |
description |
Accelerator mass spectrometry is utilized to determine the half-life of Ca-41 from the decrease of its concentration with terrestrial age in five Antarctic meteorites and a recent fall. The meteorites were selected on the basis of their Cl-36 concentrations, which showed a span of terrestrial ages of about 600 ka, and on the basis of other cosmogenic nuclide concentrations which indicated that the meteorites had small preatmospheric sizes, and sufficiently long irradiation times in space that the concentrations of Ca-41 and Cl-36 were in secular equilibrium prior to the meteorites' fall to earth. The half-life of Ca-41 is determined at 103 + or - 7 ka. Topics discussed include the effects of undersaturation (short exposure time in space), shielding (the samples are from the interior of a large meteorite), and weathering on the cosmogenic nuclide concentrations in meteorites. |
format |
Other/Unknown Material |
author |
Klein, Jeffrey Fink, David Middleton, Roy Nishiizumi, Kunihiko Arnold, James |
author_facet |
Klein, Jeffrey Fink, David Middleton, Roy Nishiizumi, Kunihiko Arnold, James |
author_sort |
Klein, Jeffrey |
title |
Determination of the half-life of Ca-41 from measurements of Antarctic meteorites |
title_short |
Determination of the half-life of Ca-41 from measurements of Antarctic meteorites |
title_full |
Determination of the half-life of Ca-41 from measurements of Antarctic meteorites |
title_fullStr |
Determination of the half-life of Ca-41 from measurements of Antarctic meteorites |
title_full_unstemmed |
Determination of the half-life of Ca-41 from measurements of Antarctic meteorites |
title_sort |
determination of the half-life of ca-41 from measurements of antarctic meteorites |
publishDate |
1991 |
url |
http://ntrs.nasa.gov/search.jsp?R=19910055023 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19910055023 Accession ID: 91A39646 |
op_rights |
Copyright |
_version_ |
1766258433914306560 |