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- W2085997341 abstract "Abstract The relationship between published Pu/U ratios in chondritic whitlockite and the presently measured uranium concentrations has been examined. The correlation is found to be consistent with the assumption that the average plutonium content in the whitlockite crystals was approximately constant at a certain reference time, a conclusion supported by known plutonium contents of five chondrites. Fission-track ages of 4.31 Gyr have been obtained for the whitlockites of the LL5 chondrites Olivenza and Alta'ameem, assuming a mean plutonium content of 20 ppb, 4.57 Gyr ago. In both these chondrites, track studies show that severe fractionation of plutonium relative to uranium has occurred between whitlockite and chlorapatite. The need for a more reliable reference element than uranium for indicating plutonium-244 concentrations is discussed, and samarium is suggested as a possibility." @default.
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- W2085997341 date "1981-06-01" @default.
- W2085997341 modified "2023-09-26" @default.
- W2085997341 title "Constancy of 244Pu distribution in chondritic whitlockite" @default.
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- W2085997341 doi "https://doi.org/10.1016/0191-278x(81)90023-8" @default.
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