Uranium depth profile

Figure 9.18 Depth profile of uranium concentration in the Sea of Galilee. (L. Halicz, ]. S. Becker et al. Int. J. Mass Spectrom., 249-250, 296 (2006). Reproduced by permission of Elsevier.)...

Figure 44 Depth profiles using stable isotopic substitution of reactants to reveal oxidation mechanism of water reaction with uranium and its inhibition in the presence of oxygen. N2+ primary beam used. See text. (From Refs. 142 and 143.)...

Figure 45 Depth profile on uranium sample exposed sequentially to 16OH->, 18OH2, 16OH 18OH 16OH0, for 6 hr each at 80°C and 0.6 kPa. See text. (From Ref. 143.)...

In deeper waters the deficiency of from its uranium precursor is dramatic (Table 5.5) because this thorium isotope has a very long half hfe (c. 75 000 y) and thus particle scavenging is much more effective at removal than the ingrorvth toward secular equilibrium with Bacon and Anderson (1982) showed that depth profiles of dissolved and particulate °Th could be used to demonstrate the dynamic relationship of metal exchange between particulate and dissolve forms. They argued that the thorium-uranium isotope pair could be used as a tracer of particle removal rates for those metals that faU in the category of adsorbed in Fig. 1.3. 

Christl, M., Lachner, J., Vockenhuher, C. et al. (2012). A depth profile of uranium-236 in the Atlantic Ocean, Geochim. Cosmochim. Acta 77, 98-107. 

Sakaguchi, A., Kadokura, A., Steier, P. et al. (2012b). Uranium-236 as a new oceanic tracer A first depth profile in the Japan Sea and comparison with caesium-137, Earth Planet. 

---