The multielement potential of fast neutron cyclic activation analysis |
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Authors: | S. E. Nonie K. Randle |
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Affiliation: | (1) Radiation Centre, School of Physics and Space Research, University of Birmingham, P.O. Box 363, B15 2TT Birmingham, UK;(2) School of Chemistry, University of Birmingham, P.O. Box 363, B15 2TT Birmingham, UK;(3) Present address: Department of Applied Physics, University of Technology, Lae, Papua, New Guinea |
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Abstract: | Cyclic neutron activation analysis (CNAA), has, in recent years been developed as a useful analytical tool for the assay of short-lived isotopes in single element situations. The work described in this paper investigates the potential of the technique for composite samples having a wide range of elements that produce short-lived and long-lived isotopes on neutron irradiation. Accelerator-derived neutrons with average energies of 3 MeV, 6MeV and 14MeV were employed in what has been dubbed Fast Neutron Cyclic Neutron Activation Analysis (FNCAA). The approach to multi-element analysis entailed: (a) determination of cycle parameters in single element samples via the reactions27Al(n, p)27Mg (9.6 min,E =840keV), and137Ba(n, n![prime](/content/w7j7375208834400/xxlarge8242.gif) )137mBa(2.3min,E =662keV), (b) a test of the method on a composite rock sample, (c) determination of analytical sensitivities using both powdered kale and rock standards and (d) a comparison of analytical results with other techniques. The results obtained in all these measurements are presented and discussed. |
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