S. F. Boulyga, J. S. Becker, J. L. Matusevitch, and H. Dietze, Isotope ratio measurements of spent 394 reactor uranium in environmental samples by using inductively coupled plasma mass spectrometry

, Int. J. Mass Spectrom, vol.203, pp.143-154, 2000.

J. S. Santos, L. S. Teixeira, W. N. Santos, V. A. Lemos, J. M. Godoy et al., , p.397

, Uranium determination using atomic spectrometric techniques: An overview, Anal. Chim. Acta, vol.674, pp.143-156, 2010.

G. Yang, H. Tazoe, and M. Yamada, Determination of 236 U in environmental samples by single 400 extraction chromatography coupled to triple-quadrupole inductively coupled plasma-mass

, Anal. Chim. Acta, vol.944, 2016.

W. Bu, J. Zheng, M. E. Ketterer, S. Hu, S. Uchida et al., Development and application of 403 mass spectrometric techniques for ultra-trace determination of 236 U in environmental samples-A 404 review, Analyt. Chim. Acta, vol.995, 2017.

M. Christl, C. Lachner, C. Vockenhuber, O. Lechtenfeld, I. Stimac et al.,

. Synal, A depth profile of uranium-236 in the Atlantic ocean, Geoch. Cosmochim. Acta, vol.777, pp.98-407, 2012.

R. Tortorello, E. Widom, and W. H. Renwick, Use of uranium isotopes as a temporal and spatial tracer 409 of nuclear contamination in the environment, J. Environ. Radioact, vol.124, pp.287-300, 2013.

A. Sakaguchi, T. Nomura, P. Steier, R. Golser, K. Sasaki et al.,

E. P. Horwitz, M. L. Dietz, R. Chiarizia, and H. Diamond, Separation and preconcentration of uranium 419 from acidic media by extraction chromatography, Anal. Chim. Acta, vol.266, pp.25-37, 1992.

J. Qiao, X. Hou, P. Steier, S. Nielsen, and R. Golser, Sequential injection method for rapid and 422 simultaneous determination of 236 U, 237 Np, and Pu isotopes in seawater, Anal. Chem, vol.85, pp.11026-423, 2013.

M. Tanimizu, N. Sugiyama, E. Ponzevera, and G. Bayon, Determination of ultra-low 236 U/ 238 U 425 isotope ratios by tandem quadrupole ICP-MS/MS, J. Anal. Atom. Spectrom, vol.28, pp.1372-1376, 2013.

,

M. , Inappropriate tail corrections can cause large inaccuracy in isotope ratio 428 determination by MC-ICP-MS, J. Anal. Atom. Spectrom, vol.16, pp.1121-1125, 2001.

L. Balcaen, E. Bolea-fernández, M. Resano, and F. Vanhaecke, Inductively coupled plasma-tandem 431 mass spectrometry (ICP-MS/MS): A powerful and universal tool for the interference-free 432 determination of (ultra) trace elements-A tutorial review, Anal. Chim. Acta, vol.894, pp.7-19, 2015.

G. Yang, H. Tazoe, K. Hayano, K. Okayama, and M. Yamada, Isotopic compositions of 236 U, 239 Pu, 435 and 240 Pu in soil contaminated by the Fukushima Daiichi Nuclear Power Plant accident, Sci. Rep, vol.7, p.13619, 2017.

H. Jaegler, F. Pointurier, S. Diez-fernández, A. Gourgiotis, H. Isnard et al., 438 measurements by using CO 2 as the gas in a collision/reaction cell-based MC-ICPMS, J. Anal. Atom

. Spectrom, , vol.25, pp.1939-1945, 2010.

S. D. Tanner, C. Li, V. Vais, I. Barano, and D. R. Bandura, Chemical resolution of Pu(+) from U(+)

, Am(+) using a band-pass reaction cell inductively coupled plasma mass spectrometer

, Chem, vol.76, 2004.

V. Vais, C. Li, and R. J. Cornett, Separation of plutonium from uranium using reactive chemistry in a 449 bandpass reaction cell of an inductively coupled plasma mass spectrometer, Anal. Bioanal. Chem, vol.380, pp.235-239, 2004.

A. Gourgiotis, H. Isnard, M. Aubert, E. Dupont, I. Almahamid et al.,

S. Cassette, A. Panebianco, F. Letourneau, and . Chartier, Accurate determination of Curium and, p.453

, Californium isotopic ratio by inductively coupled plasma quadrupole mass spectrometry

, in 248Cm samples for transmutation studies, Int. J. Mass Spectrom, vol.291, pp.101-107, 2010.

,

W. A. Russell, D. A. Papanastassiou, and T. A. Tombrello, Ca isotope fractionation on the Earth and 457 other solar system materials, Geochim. Cosmochim. Acta, vol.42, issue.78, pp.90105-90114, 1978.

J. Kragten, Calculating standard deviations and confidence intervals with a universally applicable 460 spreadsheet technique, Analyst, vol.119, 1994.

J. Kragten, A standard scheme for calculating numerically standard deviations and confidence