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Campo del Cielo iron meteorite: Sample shielding and meteoroid's preatmospheric size
Author(s) -
LIBERMAN R. G.,
NIELLO J. O. FERNÁNDEZ,
TADA M. L.,
FIFIELD L. K.,
MASARIK J.,
REEDY R. C.
Publication year - 2002
Publication title -
meteoritics and planetary science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.09
H-Index - 100
eISSN - 1945-5100
pISSN - 1086-9379
DOI - 10.1111/j.1945-5100.2002.tb01111.x
Subject(s) - meteorite , meteoroid , iron meteorite , accelerator mass spectrometry , radius , electromagnetic shielding , mass spectrometry , astrobiology , geology , mineralogy , physics , computer security , quantum mechanics , computer science
— Long‐lived cosmogenic radioisotopes, 10 Be, 26 Al, 36 Cl, 41 Ca and 59 Ni, have been measured in five samples from the Campo del Cielo iron meteorite by accelerator mass spectrometry (AMS). The 36 Cl activities were significantly above the background. For the concentrations of the other four radioisotopes, only upper limits were obtained that were, however, consistent with the 36 Cl result. The measured 36 Cl activity allowed an estimate of the meteoroid's preatmospheric size: a radius larger than 300 cm and a mass of at least 840 000 kg. We conclude that this meteorite might be one of the largest meteorites to have been recovered.