13-18 May 2018
Casino Conference Centre
Europe/Prague timezone

Radioactivity of chondrites and meteorites from Mars and the Moon: Measurements and Monte Carlo simulations

14 May 2018, 17:15
1h 30m
Gallery (Casino Conference Centre)

Gallery

Casino Conference Centre

Poster Nuclear Analytical Methods Poster NAM

Speaker

Prof. Pavel P. Povinec (Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovakia)

Description

Low-level concentrations of primordial and cosmogenic radionuclides were determined in recently fallen chondrites and in meteorites from Mars and the Moon. The radionuclide measurements showed a wide range of concentrations of $^{22}Na$, $^{26}Al$, $^{46}Sc$, $^{54}Mn$ and $^{57}Co$. The absence of the neutron product ($^{60}Co$) in some of the meteorites indicates that their pre-atmospheric radius was small (on the order of 10 cm). This has also been confirmed by Monte Carlo simulations of the production rates of investigated cosmogenic radionuclides, and their comparison with experimental data. The cosmic-ray exposure ages of the investigated meteorites have been estimated to range from 1 to 5 million years. The agreement between the simulated and observed $^{26}Al$ activities indicates that the meteorites were mostly irradiated by a long-term average flux of galactic cosmic rays.

Primary author

Prof. Pavel P. Povinec (Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovakia)

Co-authors

Prof. Jozef Masarik (Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovakia) Robert Breier (Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovakia) Ludovic Ferrière (Natural History Museum, Vienna, Austria) Andrej Kováčik (Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovakia; Microstep/MIS s.r.o., Bratislava, Slovakia) Christian Koeberl (Natural History Museum, Vienna, Austria; University of Vienna, Austria) Robert J. Macke (Vatican Observatory, Vatican City-State) Prof. Vladimír Porubčan (Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovakia) Ivan Sýkora (Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovakia) Juraj Tóth (Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovakia)

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