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• W1967029642 abstract "UXe chronology requires knowledge of the product of the decay constant (λsƒ) and the fractional yield of 136Xe (136Ysƒ) produced by the spontaneous fission of 238U. However, values derived from U oxides are in conflict with those obtained from U-bearing accessory minerals. We present combined UPb and UXe data for a carefully selected suite of zircon and monazite separates. All samples have precise, concordant or near-concordant UPb ages and yield a λsƒ ∗136Ysƒ value of (6.83 ± 0.18) × 10−18 a−1. Recoil loss of fissiogenic Xe was corrected for numerically or circumvented by abrading samples or analysing very large crystals. Old crystal cores that might have retained their fission Xe but not their radiogenic Pb were not detected in any of the samples. No significant contribution of Xe from 232Th fission is expected as long as the ThU ratio is ⩽ 10. Taken together, these observations indicate that the derived value for λsƒ ∗136Ysƒ is correct. This value is similar to that from earlier studies of accessory minerals, but some 20% higher than that determined recently from carefully selected U minerals, including pitchblende, uraninite and coffinite. This suggests that U oxides systematically lose fissiogenic Xe, possibly due to regeneration of the crystal lattice or changes in oxidation state. UXe ages from such minerals should be interpreted with caution." @default.
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• W1967029642 date "1994-12-01" @default.
• W1967029642 modified "2023-09-23" @default.
• W1967029642 title "Uranium-xenon chronology: precise determination of λsƒ ∗136Ysƒ for spontaneous fission of 238U" @default.
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• W1967029642 doi "https://doi.org/10.1016/0012-821x(94)90177-5" @default.
• W1967029642 hasPublicationYear "1994" @default.
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