Determination of fluorine in zinc ores using an isotope neutron source based automated neutron activation analysis system |
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Authors: | L De Norre J Op De Beeck J Hoste |
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Institution: | (1) Institute for Nuclear Sciences, Proeftuinstraat 86, B-9000 Gent, (Belgium) |
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Abstract: | A method has been developed for routine determination of fluorine in zinc sulfide ores by activation with fast neutrons from
a 6.6 Ci227Ac−Be isotope source and counting of the 4.5 to 7 MeV gamma-rays of the product nuclide16N. Samples and standards consist of pellets pressed from a mixture of powdered material with wax or graphite. Samples and
standards alternate in a sequence of 20 seconds irradiation, 4 seconds decay and 20 seconds counting. This analysis sequence,
including the computation of the analysis results from the counting data automated by means of a LSI-11 Microprocessor with
12K×16 bit memory. The zinc ores, containing 0.3 to 0.7% fluorine have been analysed with a precision ranging from 1.56 to
1.33% relative. As a test for the reliability of the method, three standard reference materials were analysed in the same
way as the zinc ore samples. |
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