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  • 1 Institute of Nuclear Physics Ulugbek 702132 Tashkent Uzbekistan
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Instrumental neutron activation techniques for the determination of 26–36 impurities in MoSi2, WSi2, TiB2, NbB2, TiC, NbC and SiC with detection limit of 0.1–0.000001 ppm in the range of contents of 100–0.001 ppm have been developed. The determination of this large number of elements was achieved with using complex conditions of irradiation, including varying neutron energy and choosing optimal time parameters. The contents of short-lived radionuclides also have been determined. Self-shielding and disturbance of neutron flux, absorption of -rays were taken into account both with the help of literature data and preliminarily obtained experimental results.