Other
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998m%26ps...33.1311m&link_type=abstract
Meteoritics & Planetary Science, vol. 33, no. 6, pp. 1311-1316.
Other
11
Scientific paper
Measurements of particle tracks, cosmogenic radionuclides and rare gas isotopes in Mbale indicate that the meteoroid had a simple, one stage exposure for 30.2 Ma in the interplanetary space. Based on the measured track production rates and 60Co and 26Al activities, the meteoroid size is estimated to be equivalent of sphere with a radius of about 36cm. The activities of several cosmogenic radionuclides i.e. 57Co, 54Mn, 22Na, 44Ti and 26Al, in two fragments having different shielding, as estimated by their track density and 60Co activity, provided the depth variation in their production rates. 57Co, 54Mn and 22Na activities agree with the production expected around the maximum of the solar cycle 22 as calculated from the sunspot numbers. The U, Th-4He and K-40Ar ages are measured to be 0.54 Ga, indicating a late thermal event, in agreement with the thermal history of some other L group chondrites. The trapped nitrogen has (15N of -57 +/- 4.9, much lighter than the average L-group chondrite value, indicating the presence of an isotopically anomalous light N-component.
Bhandari Narendra
Bonino Gianfranco
Castagnoli Cini G.
Clement C. J.
Murty Sripada V. S.
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