According to the gamma-spectrometry analysis measurements of the bushmeat samples taken by hunters in exclusion zone 137Cs activity concentration could reach the value of 3 kBq/kg. The probable effective doses of the internal irradiation of the bushmeat consumers were calculated according to the consumer basket and using the dose coefficients (dose per unit exposure). In case of the consumption of the bushmeat that meets the hygienic level the radiation risk of cancer mortality will not exceed the value of the generalised risk equal 1,0*10-5 year-1 for the population.

The paper is devoted to determination of α-emitting radionuclides of 238, 239 + 240Pu and 241Am in liver, lungs, muscular and bone tissues of the boars on the territory of the Belarusian part of the ChNPP exclusion zone. It is shown that the content of Pu and Am isotopes in boar organs and tissues decreases in the following order: liver > bone tissues > lungs ≥ muscular tissues. The results received allow evaluation of penetration of 238, 239 + 240Pu and 241Am through the biological chain "soil-ration-organs and tissues". It is calculated that 1.7% of a boar's ration falls on the soil getting into the stomach with food. Translocation and accumulation coefficients characterizing the transfer of radionuclides through the chain "soil-vegetation-organs and tissues" were calculated. The conclusion about accumulation of Pu in the boar's body is made.

The article discusses a number of problems of space cybernetics connected with the optimum process control of informational interaction of a spacecraft with the surface of the Earth. A spacecraft is regarded as an informational active mobile plant, i.e. as a complicated mobile system supplied with necessary devices for the realization of informational interaction with the enclosing physical medium and the corresponding necessary onboard resource. It is shown that these problems are reduced to the problems of optimum programmed control by some special differential dynamic system in a Hilbert space of conditions. For a solution of the specified problems, the paper uses L.S. Pontrjagin's expanded maximum principle and the general concept of Lagrange.

Background. The effect of current carrier photonic increase bears valuable information about zone structure and mechanisms of charge carrier impulse relaxation in semiconductors. Modification of the electron energy spectrum in conditions of superposition of dimensional and magnetic quantization opens new possibilities for charge carrier diffreaction management, and thereby for photonic increase management. It is topical as the given effect may be used for development of laser emission detectors. The aim of the article is to theoretically research the influence of both the external longitudinal magnetic field and various mechanisms of electrons diffraction in a quantum wire: diffraction at edge dislocation, at longitudinal LA-pnonons, at a system of short-range impurities, at a type of spectral dependence of photonic increase current density. Materials and methods. The confining potential of a quantum wire was simulated by the potential of a two-dimensional harmonic oscillator. To calculate photonic emission current density the authors used the method of Boltzmann kinetic equation, recorded in approximation of relaxation time. The curves of spectral dependence of photonic increase current density in a quantum wire in the presence of a magnetic field were built for the quantum wire based on GaAs. Reslults and conclusions. Peak forms in Zeeman duplet in spectral dependence of photonic increase current density in a quantum wire significantly depends on the mechanism of charge carrier diffraction. It is shown that at the temperature dependence of photonic increase current density there is a maximum which is shifted to higher temperature values as the external magnetic field value increases.

Background. Technology of quantum wire growing may be accompanied by occurrence of stacking fault and edge dislocations. The latter are very important in scattering of charge carriers at considerably low temperatures, and therefore, significantly influence transporting properties of quantum wires. In a longitudinal magnetic field there appear new opportunities for charge carriers mobility control in a quantum wire, which is important for applications in semiconductor nanoelectronics. The study aims at theoretical research of the influence of edge dislocation on electron mobility in a quantum wire in an external magnetic field, and also at comparison with influences of other mechanisms of scattering. Materials and methods. For quantum wires of InSb the authors built curves of dependency of relaxation time on kinetic energy directed to edge dislocation of an electron in a quantum wire in condition of an external magnetic field. For calculation of relaxation time the model of Bonch-Bruevich and Kogan as well as Born approximation were used. Mobility calculation was performed for a quantum wire made of GaAs. Results. It is shown that for the dependecy of relaxation time on kinetic energy directed to edge dislocation of an electron characteristic are the oscillations, the period of which in a longitudinal magnetic field decreases, and the value of relaxation time increases due to hybrid quantization. It is revealed that the considered mechanism of scattering may be significant in comparison with scattering on LA-phonons and on occasional irregularities of quantum wire boundary, with the temperature interval of its effectiveness being determined by the valueof probability of acceptor centers filling in a dislocation line. Conclusions. Charge state of a dislocation line may significantly influence the range of the temperature interval, at which electron scattering predominates on edge dislocation.

In the article the mathematical model of informational interaction of the spacecraft with a surface of the Earth is considered. In a basis of construction of model lies proposed of the author the concept of active movable object as the complicated movable system intended for informational, energy or material interaction with an ambient physical environment or with other similar systems. It is shown that the corresponding model can be presented in the form of Fredholm integral operator mapping set of elements of a Hilbert space of controls (a class of admissible control actions) in a Hilbert space of information states. Investigated the properties of this operator and the corresponding reachability sets in space of information states. Considered a simplified variant of the proposed mathematical model - for interaction with the discrete environment (the isolated sources of information).

In the article the structure of a problematic of the theory of system (system-cybernetic) researches is considered. Results of the corresponding morphological analysis are presented in the form of the morphological tree containing four branches (modeling–the analysis–observation–a choice) and 57 leaves — individual tasks.

Pu in biological chain «soil - ration - organs and tissues». translocation and accumulation coefficients, characterizing the movement of radionuclides from soil to organs and tissues were calculated.