Exposure history of the Torino meteorite

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Date
1996-03
Journal Title
Journal ISSN
Volume Title
Publisher
Wiley
Abstract
We determined He, Ne, Ar, 10Be, 26Al, 36Cl, and 14C concentrations, as well as cosmic-ray track densities and halogen concentrations in different specimens of the H6 chondrite Torino, in order to constrain its exposure history to cosmic radiation. The Torino meteoroid had a radius of ∼20 cm and travelled in interplanetary space for 2.5–10 Ma. Earlier, Torino was part of a larger body. The smallest possible precursor had a radius of 55 cm and a journey through space longer than ∼65 Ma. If the first-stage exposure took place in a body with a radius of >3 m or in the parent asteroid, then it lasted nearly 300 Ma. The example of Torino shows that it is easy to underestimate first-stage exposure ages when constructing two-stage histories. © 1999-2021 John Wiley & Sons, Inc.
Description
Keywords
Meteorites, Radiation doses, Halogens, Interplanetary space, Asteroids, Density
Citation
Wieler, R., Graf, T., Signer, P., Vogt, S., Herzog, G. F., Tuniz, C., Fink, D., Fifield, L. K., Klein, J., Middleton, R., Jull, A. J. T., Pellas, P., Masarik, J., & Dreibus, G. (1996). Exposure history of the Torino meteorite. Meteoritics & Planetary Science, 31(2), 265-272. doi:10.1111/j.1945-5100.1996.tb02022.x
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