TY  - JOUR
ID  - eprints2360
EP  - 1750
VL  - 45
AV  - none
TI  - Cosmogenic radioisotopes in the Almahata Sitta ureilite
Y1  - 2010/11//
UR  - http://dx.doi.org/10.1111/j.1945-5100.2010.01135.x
IS  - 10-11
JF  - Meteoritics and Planetary Science
A1  - Taricco, Carla
A1  - Bhandari, Narendra
A1  - Colombetti, Paolo
A1  - Romero, Alberto
A1  - Vivaldo, Gianna
A1  - Sinha, Neeharika
A1  - Jenniskens, Peter
A1  - Shaddad, Muawia H.
A1  - Ballabh, G. M.
PB  - Wiley
SN  - 1086-9379
N2  - 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.
SP  - 1743
ER  -