Carbon-14 has been measured in several stone and iron meteorites. For "falls," the C(14)/Al(26) ratios in stones and the C(14)/Cl(36) ratios in irons are consistent with constant irradiation. The stone "finds" have radiocarbon ages of up to >/= 21,000 years. The Henbury craters are apparently </= 7,000 and the Odessa craters >/= 11,000 years old.
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Goel et al. (1962) studied this question.
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