caa a22 4500 469113448 CHVBK 20180323133117.0 cr unu---uuuuu 170328e19920701xx s 000 0 eng 10.1007/BF02037117 doi (NATIONALLICENCE)springer-10.1007/BF02037117 Determination of sub-PPB contents of uranium and thorium in high-purity aluminium by RNAA [Elektronische Daten] [G. Küppers, G. Erdtmann] Aluminium samples, irradiated in a reactor, are dissolved in nitric acid233Pa and239Np are adsorbed on an anion exchange column and then separately eluted. The neptunium fraction is very pure and can be counted in a liquid scintillation counter with ≈100% efficiency. From the other fraction protactinium is extracted by trioctylphosphine oxide and measured by γ-ray spectrometry. With samples of 3 g, a thermal flux of 3·1013 n cm−2s−1 and an irradiation time of 24 hours detection limits are 0.0005 ng/g for U and 0.01 ng/g for Th. Akadémiai Kiadó, 1992 Küppers G. Central Division of Chemical Analysis, Research Center Jülich Gmbh (KFA), P.O. Box 1913, D-5170, Jülich, (Germany) aut Erdtmann G. Central Division of Chemical Analysis, Research Center Jülich Gmbh (KFA), P.O. Box 1913, D-5170, Jülich, (Germany) aut Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 160/2(1992-07-01), 425-434 0236-5731 160:2<425 1992 160 10967 https://doi.org/10.1007/BF02037117 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02037117 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Küppers G. Central Division of Chemical Analysis, Research Center Jülich Gmbh (KFA), P.O. Box 1913, D-5170, Jülich, (Germany) aut NATIONALLICENCE 700 1- Erdtmann G. Central Division of Chemical Analysis, Research Center Jülich Gmbh (KFA), P.O. Box 1913, D-5170, Jülich, (Germany) aut NATIONALLICENCE 773 0- Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 160/2(1992-07-01), 425-434 0236-5731 160:2<425 1992 160 10967 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer