On the Origin of Noble Gas Anomalies in Canyon Diablo Graphite
Activation analyses on Canyon Diablo graphite show an iodine and uranium content of 337 ± 35 ppb and 108 ± 21 ppb, respectively. The 129I-129Xe formation interval for the graphite is calculated and found to agree with the formation intervals reported for stone meteorites. During exposure to cosmic rays the Abee enstatite chondrite is shown to be ≈ 50 times more effective than Canyon Diablo in producing epithermal neutrons. The 86Kr anomaly in Canyon Diablo graphite and other meteorites is compared to an unexplained 86Kr excess reported in pile-irradiated chondrites.
J. H. Bennett and O. Manuel, "On the Origin of Noble Gas Anomalies in Canyon Diablo Graphite," Earth and Planetary Science Letters, vol. 3, pp. 95-100, Elsevier, Sep 1967.
The definitive version is available at https://doi.org/10.1016/0012-821X(67)90018-0
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