Abstract
Several radionuclides lighter than Ni, with half-life ≥ 2 weeks and rare gas isotopes of He, Ne, Ar, Kr (including 2 × 105 year 81Kr), and Xe have been measured in two samples from the amphoterite Saint-Severin. The concentration of low-energy products 26Al, 22Na, 21Ne, 53,54Mn, and 83Kr are lower than are normally encountered in stone meteorites of this size, whereas the high-energy products 10Be and 38Ar (in the troilite phase) occur in normal concentrations, suggesting that the samples analyzed (from stone D) were situated in a region where the secondary cosmic radiation is only slightly developed. A comparison with calculated production rates indicates that the samples were, on the average, located at about 3–4 cm from the preatmospheric surface of the meteorite. This conclusion is further supported by high 22Ne/21Ne and 78Kr/83Kr ratios as well as the high track density of heavy cosmic radiation (Z> 24) in hypersthene grains from these samples, and the small calculated neutron density. The cosmic-ray exposure age of this meteorite as calculated from the various pairs of nuclides is (11.2 ± 1.0) × 106 years. It is shown that the relative spallation mass yields of Kr depend on the energy spectrum of cosmic rays.
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Marti, K., Shedlovsky, J.P., Lindstrom, R.M., Arnold, J.R., Bhandari, N.G. (1969). Cosmic-Ray Produced Radionuclides and Rare Gases Near the Surface of Saint-Séverin Meteorite. In: Millman, P.M. (eds) Meteorite Research. Astrophysics and Space Science Library, vol 12. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-3411-1_22
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