caa a22 4500 465731783 CHVBK 20180323111743.0 cr unu---uuuuu 170327e19900401xx s 000 0 eng 10.1007/BF02061819 doi (NATIONALLICENCE)springer-10.1007/BF02061819 Essien I. Department of Chemistry and Biochemistry, University of Cross River State, Uyo, Akwa Ibom State, (Nigeria) aut Uranium isotope anomaly in minerals [Elektronische Daten] [I. Essien] A series of leaching experiments with HF, HCl, HNO3 were carried out on samples of uranium minerals (uraninite and carnotite samples). Anomalously high234U/238U ratios were observed in some uranium fractions. The observed234U/238U activity ratios varied between the values of 1.019±0.155 and 6.210±0.504 (Ci/Ci), while the bulk carnotite sample had an activity ratio of 1.010±0.005 (Ci/Ci). These results are interpreted as due to alpha-recoil effect and changes in oxidation state of uranium. Akadémiai Kiadó, 1990 Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 139/2(1990-04-01), 331-337 0236-5731 139:2<331 1990 139 10967 https://doi.org/10.1007/BF02061819 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02061819 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Essien I. Department of Chemistry and Biochemistry, University of Cross River State, Uyo, Akwa Ibom State, (Nigeria) aut NATIONALLICENCE 773 0- Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 139/2(1990-04-01), 331-337 0236-5731 139:2<331 1990 139 10967 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer