Exposure history of H5 chondrite Gujargaon

Bhandari, N. ; Padia, J. T. ; Rao, M. N. ; Shukla, P. N. ; Suthar, K. M. ; Sarafin, R. ; Herpers, U. (1988) Exposure history of H5 chondrite Gujargaon Meteoritics, 23 . pp. 103-106. ISSN 0026-1114

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Cosmic-ray-produced tracks, He and Ne isotopes, and radionuclides have been studied in the recently fallen H5 chondrite Gujargaon. The results indicate an exposure age of about 7 Ma. The high track production rates of 0.25 to 0.69 × 106 cm-2 Ma-1 suggest that the Gujargaon meteoroid had a small size, (RE = 9-10 cm) in space and suffered 1-3 cm ablation in the atmosphere. The conclusion about the meteoroid size is supported by the low activity of neutron capture isotope 60Co and high spallogenic 22Ne/21Ne ratio of about 1.25. The data on long lived isotopes 10Be, 53Mn, and 26Al are used to derive production rates of these isotopes in a rock having a radius of 9 cm, and the activity levels of the short lived isotopes 22Na and 54Mn are used to estimate the effect of modulation of galactic cosmic rays at the time of solar maximum of 1982.

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