OverviewOccurrenceCharacteristicsApplicationsHistoryCompoundsIsotopesHuman exposure
Along with all elements having atomic weights higher than that of iron, uranium is only naturally formed by the r process rapid neutron capture in supernovae and neutron star mergers. Primordial thorium and uranium are only produced in the r process, because the s process slow neutron capture is too slow and cannot pass the gap of instability after bismuth. Besides the two extant primordial uranium isotopes, U and U, the r process also produced significant quantities of U, which has a shorter half life and has lon
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