Age and lead isotope systemat- ics of uranium-enriched cobalt mineralization in the Modum Complex, south Norway: implications for Precambrian crustal evolution in the SW part of the Baltic Shield. Precambrian Res. 91, 419-432.Andersen, T. & Grorud, H.-F. 1998: Age and lead isotope ...
Experiments on the isotope shift of U, U, U, U, and Uin the uranium emission line U I 5027.4 A are made with the photoelectric interferometer Hypeac. The ratios U+U/Uand U+U/Ucan be determined with the Automatic Electronic Integrator. The possibility of interference between the lines U50...
236U (t½ = 2.34 × 107 years) is an isotope of uranium that is produced by thermal neutron capture of 235U via (n, γ)-reactions and through 238U (n, 3n) 236U reactions with fast neutrons. Even though a small amount of 236U (~35 kg) occurs naturally in the Earth...
A series of leaching experiments with HF, HCl, HNO 3 were carried out on samples of uranium minerals (uraninite and carnotite samples). Anomalously high 234 U/ 238 U ratios were observed in some uranium fractions. The observed 234 U/ 238 U activity ratios varied between the values of ...
Bulk dissolution rates for sediment from ODP Site 984A in the North Atlantic are determined using the 234U/238U activity ratios of pore water, bulk sediment, and leachates. Site 984A is one of only several sites where closely spaced pore water samples were obtained from the upper 60 meters...
Haskell library containing isotopic masses and relative abundances for elements from Hydrogen to Bismuth and Thorium and Uranium (excluding Technetium and promethium), i.e., all elements with naturally-occurring isotopes. chemistry mass-spectrometry isotope Updated Sep 29, 2019 Haskell img...
Noun1.isotope- one of two or more atoms with the same atomic number but with different numbers of neutrons atom- (physics and chemistry) the smallest component of an element having the chemical properties of the element radioisotope- a radioactive isotope of an element; produced either naturally...
Examination of the global uranium cycle — whereby uranium from the Earth’s crust is first transported to the oceans and then returned, by subduction, to the mantle — shows that the subducted uranium is isotopically distinct from the Earth as a whole a
The reproducibility of the substoichiometric extraction is 0.46 or 0.62%, respectively. The former method is superior because extraction of uranyl ion with TBP alone is negligible. The method is applicable to > ca. 10 μg of uranium. 展开 ...
Uranium 238U/235U Isotope Ratios as Indicators of Reduction: Results from an in situ Biostimulation Experiment at Rifle, Colorado, U.S.A. Uranium 238U/235U Isotope Ratios as Indicators of Reduction: Results from an in situ Biostimulation Experiment at Rifle, Colorado, U.S.A.: Environmental .....