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[en] Technical peculiarities of experiments on determination of neutron-physical parameters for heterogeneous lattices are considered and the experiments with the uranium-thorium-graphite RBMK type polylattices are described. Three variants differing in thorium content in a polycell, a polycell arrangement and a structure of channel with thorium are investigated. Using as an example one of the lattices, the effect of channel dewatering on neutron-physical parameters is studied. Distributions of different-energy neutrons over the cell radius (microdistribution) and macrodistributions of neutron flux density, as well as balance ratios of 232Th, 235U and 238U, are determined. The data obtained can be used for testing the computer programs for calculating heterogeneous reactor lattices and thorium constants
Journal
[en] The authors experimentally and theoretically determine the differential cross sections for some neutron reactions with the target nuclei of several BN-350 reactor material constituents. The nuclei include iron 54, iron 56, nickel 58, molybdenum 92, cobalt 59, manganese 55, and uranium 235. The cross sections were determined relative to the uranium 235 fission cross section by fast neutrons. Irradiation procedures are discussed and results are tabulated. The spatial distribution of the neutron and gamma spectra was calculated using the six-group approximation and the BNAB-78 system of constants
Journal
[en] Gamma radiation spectral measurements of uranium and plutonium samples irradiated by neutrons of 252Cf source are described. Peaks of 138Cs and other short-lived fissile products are observed in spectra. Content of fissile isotope in the samples was characterized by the intensity of peaks
[ru]
Описаны измерения спектров гамма-излучения образцов урана и плутония, облученных нейтронами источника 252Cf. В спектрах наблюдаются пики 138Cs и других короткоживущих продуктов деления. Интенсивность пиков характеризует содержание в образцах делящихся изотоповJournal
[en] Modification of methodology, including gamma- and roentgenospectrometry of 241Am and relative content of Pu/241Am for determination of specific activity of 241Am and plutonium isotopes in the soil samples is substantiated. The possibilities of the above methodology are studied and comparison with the traditional radiochemical methodology is given
Journal
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