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Cosmogenic radioisotopes in the Almahata Sitta ureilite

Taricco, Carla and Bhandari, Narendra and Colombetti, Paolo and Romero, Alberto and Vivaldo, Gianna and Sinha, Neeharika and Jenniskens, Peter and Shaddad, Muawia H. and Ballabh, G. M. Cosmogenic radioisotopes in the Almahata Sitta ureilite. Meteoritics and Planetary Science, 45 (10-11). pp. 1743-1750. ISSN 1086-9379 (2010)

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Abstract

Asteroid 2008 TC3 was predicted to fall in Sudan on October 7, 2008, and 2 months later, 15 meteorite fragments were recovered from the Nubian Desert. Most of these fragments were classified as polymict ureilites. In the largest ureilitic fragment #15, weighing 75 g, we have measured six gamma emitting radionuclides (46Sc, 57Co, 54Mn, 22Na, 60Co, and 26Al) by nondestructive whole rock counting using a sensitive gamma-ray spectrometer. The activities of 60Co, produced mainly by neutron capture in cobalt, and 26Al indicate that fragment #15 was located at a depth of 41 ± 14 cm inside the 1.5–2 m radius asteroid. The activity of other radionuclides is also consistent with this shielding depth within the asteroid. The 22Na/26Al activity ratio is higher than expected for the average cosmic ray flux, probably due to the unusually prolonged solar minimum before the fall.

Item Type: Article
Identification Number: 10.1111/j.1945-5100.2010.01135.x
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Research Area: Economics and Institutional Change
Depositing User: Gianna Vivaldo
Date Deposited: 10 Nov 2014 13:11
Last Modified: 25 Mar 2015 09:16
URI: http://eprints.imtlucca.it/id/eprint/2360

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