caa a22 4500 469110740 CHVBK 20180323133110.0 cr unu---uuuuu 170328e19920201xx s 000 0 eng 10.1007/BF02039778 doi (NATIONALLICENCE)springer-10.1007/BF02039778 Parsa Bahman New Jersey State Department of Environmental Protection and Energy, DEQ/BRIAS, CN 411, Trenton, New Jersey, (USA) aut A sequential radiochemical procedure for isotopic analysis of uranium and thorium in soil [Elektronische Daten] [Bahman Parsa] A sequential radiochemical procedure for isotopic analysis of uranium and thorium in soil has been developed. Analysis involves total dissolution of the samples to allow equilibration of the natural isotopes with added tracers, followed by radiochemical separation using anion exchange chromatography (BioRad AG 1−X8). Further separation and purification is performed employing solvent extraction techniques. Finally, the U and Th fractions are co-precipitated with lanthanum and cerium fluoride, respectively, and quantified by alpha-particle spectrometry. Overall chemical yields range from 60 to 90%. Under normal operating conditions and present counting set up, the minimum detectable concentration (MDC) is approximately 2 Bq/kg for soil samples. This is based on one gram aliquot of sample, 80% chemical yield, and 1000 minute counting with a detector having about 15% counting efficiency. The procedure has been successfully tested with Standard Reference Materials. Various soil samples were analyzed with high chemical yields and fine quality of alpha-spectra. Decontamination factor studies were performed to determine the extent of the carry over of210Po,225Ac,226Ra, and229Th into U fraction and210Po,225Ac,226Ra, and232U into Th fraction. Akadémiai Kiadó, 1992 Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 157/1(1992-02-01), 65-73 0236-5731 157:1<65 1992 157 10967 https://doi.org/10.1007/BF02039778 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02039778 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Parsa Bahman New Jersey State Department of Environmental Protection and Energy, DEQ/BRIAS, CN 411, Trenton, New Jersey, (USA) aut NATIONALLICENCE 773 0- Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 157/1(1992-02-01), 65-73 0236-5731 157:1<65 1992 157 10967 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer