INAA determination of holmium in submilligram samples of cosmochemical and geochemical interest and the second-order activation interference |
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| Authors: | I Kawabe T Tanaka V Ekambaram A M Davis L Grossman |
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| Institution: | (1) Department of the Geophysical Sciences, University of Chicago, 5734 South Ellis Avenue, 60637 Chicago, IL, USA;(2) Present address: Department of Earth Sciences, Faculty of Science, Ehime University, Bunkyo-cho, 2-5, 790 Matsuyama, Japan;(3) Present address: Geological Survey of Japan, Higashi 1-1-3, Yatabe, 305 Iabaraki, Japan;(4) Present address: Woodward-Clyde Consultants, 4582, South Ulster Street, Parkway, 80237 Denver, CO;(5) Present address: James Franck Institute, University of Chicago, 5640 South Ellis Avenue, 60637 Chicago, IL;(6) Present address: Enrico Fermi Institute, University of Chicago, 5640 South Ellis Avenue, 60637 Chicago, IL |
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| Abstract: | Second-order neutron activation becomes a serious interference in NAA determinations of REE in submilligram samples of meteoritic and terrestrial materials when neutron fluences reach levels of 1020 n·cm–2 or more. The Dy-interference to Ho determination and the Eu-interference to Gd determination are quite, large. We discuss the importance of second-order activation interferences in REE determinations, and present an experimental method to correct the Dy-interference to Ho determination by INAA. Ho concentrations in splits of less than 0.2 mg of BCR-1 and SP can be accurately determined by INAA with a neutron fluence of 2·1020 n·cm–2 in spite of large Dy interferences of up to 200%. It is necessary for NAA determinations of REE with high neutron fluences that each REE standard be separated from its neighboring REE, in order to correct the second-order activation interferences experimentally. |
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