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• W2024774004 endingPage "1661" @default.
• W2024774004 startingPage "1651" @default.
• W2024774004 abstract "In situ laser extraction techniques were applied for the study of heavy noble gases in a polished section of Zone 13 from the natural nuclear reactor in Okelobondo. Three main mineral phases were identified in this polished section using SEM-EDX. The Xe and Kr isotopic structures were determined by multiple measurements in each of these phases. Twenty-four isotopic analyses of the gases extracted from two different U-rich phases revealed nearly normal fission spectra. All 9 analyses of a U-free phase, consisting mainly of alumophosphates, demonstrated an unusual isotopic composition (136Xe/134Xe/132Xe/131Xe/130Xe/129Xe/128Xe = 1/1.25/1.73/0.89/0.0045/0.274/0) with concentrations ranging up to 10−2 cm3 STP/g. This is the highest Xe concentration ever measured in a natural material. Kr was also anomalous, although to a lesser extent. These results confirm the presence of Chemical Fractionation of Fission Xe (CFF-Xe) in the Okelobondo alumophosphates. CFF-Xe is a decay product of intermediate fission fragments that have migrated out of the U-rich host phases into adjacent U-free minerals. The CFF-Xe spectra in the alumophosphates are also accompanied by 130Xe excesses, which are attributed to neutron capture on fissiogenic 129I that apparently migrated out of the nearby U-rich minerals. The 130Xe/129Xe ratio allows us to estimate the thermal equivalent neutron dose of 1.1 × 1021 n/cm2. The presence of an unknown fission component remarkably similar in composition to CFF-Xe can be inferred from the atmospheric and terrestrial data. This leads us to the hypothesis that the CFF process has operated on a global scale on the Earth." @default.
• W2024774004 created "2016-06-24" @default.
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• W2024774004 date "2000-05-01" @default.
• W2024774004 modified "2023-10-10" @default.
• W2024774004 title "Anomalous xenon in zone 13 Okelobondo" @default.
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• W2024774004 doi "https://doi.org/10.1016/s0016-7037(00)00334-3" @default.
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