Abstract
A method for the simultaneous, radiochemical neutron activation analysis of uranium and thorium at trace levels in biological materials is described, based on a technique known as LICSIR, in which a double neutron irradiation is employed. In the first, long irradiation233Pa (27.0 d) is induced by neutron capture on232Th and then the sample is cooled for several weeks. A second short irradiation to induce239U (23.5 m) is followed by a rapid sequential radiochemical separation by solvent extraction of239U with TBP and233Pa with TOPO. Chemical yields of239U and233Pa were measured for each sample aliquot using added235U and231Pa tracers from the γ-spectra of the separated fractions. The technique was validated by quality control analyses.
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A. R. BYRNE, Radiochem. Radioanal. Letters, 52 (1982) 99.
E. STEINNES, Talanta, 22 (1975) 1041.
E. STEINNES, Anal. Chim. Acta, 76 (1975) 461.
M. DERMELJ, J. NOVAK, V. RAVNIK, L. KOSTA, J. Radioanal. Chem., 44 (1978) 271.
A. R. BYRNE, L. BENEDIK, Talanta, 35 (1988) 161.
A. R. BYRNE, L. BENEDIK, Sci. Total Environ., 107 (1991) 143.
J. W. MORGAN, J. F. LOVERING, Anal. Chim. Acta, 28 (1963) 405.
D. N. EDGINGTON, Int. J. Appl. Radiation Isotopes, 18 (1967) 11.
H. S. DANG, D. D. JAISWAL, C. M. SUNTA, S. D. SOMAN, Health Phys., 57 (1989) 393.
U. NIESE, J. Trace Microprobe Techniques, 1 (1983–82) 339.
U. NIESE, S. NIESE, J. Radioanal. Nucl. Chem., 91 (1985) 17.
M. DERMELJ, V. STIBILJ, J. STEKAR, A. R. BYRNE, Fresen. Z. Anal. Chem., 340 (1991) 258.
B. SMODIŠ, J. Stefan Institute Report, US DP-9493 (1991), Ljubljana, Slovenia.
A. CHATT, H. S. DANG, B. B. JAYAWICKREME, L. S. McDOWELL, D. L. PEGG, J. Radioanal. Nucl. Chem., 124 (1988) 65.
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Benedik, L., Byrne, A.R. Simultaneous determination of trace uranium and thorium by radiochemical neutron activation analysis. Journal of Radioanalytical and Nuclear Chemistry, Articles 189, 325–331 (1995). https://doi.org/10.1007/BF02042612
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DOI: https://doi.org/10.1007/BF02042612