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- W1997413807 abstract "Abstract— 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 interplanetary space. On the basis of the measured track production rates and 60 Co and 26 Al activities, the meteoroid is estimated to be a sphere with a radius of ∼36 cm. The activities of several cosmogenic radionuclides ( i.e. , 57 Co, 54 Mn, 22 Na, 44 Ti, and 26 Al) in two fragments having different shielding, as estimated by their track density and 60 Co activity, provide the depth variation in their production rates. Cobalt‐57, 54 Mn and 22 Na activities agree with the production that is expected around the maximum of the solar cycle 22 as calculated from the Sunspot numbers. The U, Th‐ 4 He and K‐ 40 Ar ages are measured to be 0.54 Ga indicating a late thermal event which is in agreement with the thermal history of some other L group chondrites. The trapped N has δ 15 N of −57 ± 4%o, which is much lighter than the average L‐group chondrite value; this indicates the presence of an isotopically anomalous light N component." @default.
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- W1997413807 date "1998-11-01" @default.
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- W1997413807 title "Cosmogenic effects in Mbale, L5/6 chondrite" @default.
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- W1997413807 doi "https://doi.org/10.1111/j.1945-5100.1998.tb01315.x" @default.
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