Ca-41 in iron falls, Grant and Estherville - Production rates and related exposure age calculations

Details Ca-41 in iron falls, Grant and Estherville - Production rates and related exposure age calculations Ca-41 in iron falls, Grant and Estherville - Production rates and related exposure age calculations

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.107..115f&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 107, no. 1, Oct. 1991, p. 115-128. Research supported by NSF.

Computer Science

15

Calcium Isotopes, Iron Meteorites, Meteoritic Composition, Radioactive Age Determination, Mass Spectroscopy, Particle Accelerators, Spallation

Scientific paper

Results are presented of the first phase of a Ca-41 cosmogenic studies program aimed at establishing baseline concentrations and trends in selected meteorites and the use of Ca-41 in estimating exposure ages and preatmospheric meteorite radii. The average Ca-41 saturation activity recorded in four small iron falls is 24 +/-1 dpm/kg. This finding, together with measurements at the center and surface of the large iron Grant, indicates that production of Ca-41 from spallation on iron is weakly dependent on shielding to depths as large as 250 g/sq cm. The (K-41)-Ca-41 exposure age of Grant is estimated at 330 +/-50 My, and an upper limit to its terrestrial age of 43 +/-15 ky. A comparison of the Ca-41 contents of stony and metallic material separated from the mesosiderite Estherville identifies low-energy neutron capture on native Ca as a second important channel of production. It is found that the Ca-41 signal in the stone phase from three meteorites correlates with their size, and that the inferred low-energy neutron fluxes vary by a factor of at least 20.

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