No abstract available

[en] Numerous data are presented and discussed on concentrations of ⁹⁰Sr in bones and ¹³⁷Cs in muscular tissues of main food fishes fished out in different regions of the ocean, seas, lakes and rivers. They are indicative of the absence of appreciable hygienic hazards for man from eating food fishes

[en] Short note

[en] A comparison is made of spectra of electrons, which emerge from a silicon target with distinct surface state in small and large solid angles under the action of helium ions with energy up to 10 keV. The spectra in small and large solid angles differ significantly. A comparison of the shape of the ground maximum of such spectra allows to get information about the excited electron distribution. In the high-energy range specific features of a spectrum are more clearly defined when measurements are taken in a small solid angle

No abstract available

[en] Paper studies the structure and peculiarities of output signals of a pulse radar-reflectometer in the experiments with tokamak plasma. A method to analyze experimental data of pulse reflectometry taking account of the effect of density fluctuations is suggested. The results obtained by means of this method using tokamak T-11 M under ohmic conditions are compared with the results of calculating and theoretical investigations into interaction of microwave pulses with plasma density fluctuations. It is shown that correction to the position of plasma reflecting layers occurring due to neutralization of reflectometer data rather satisfactorily agrees with the correction obtained from calculations in terms of unidimensional model at discharge stationary phase

[en] The dependence of the relative intensity of the hydrogen isotopes atomic lines in the helium mixture during excitation in a high-frequency discharge at mean and high pressures is investigated. A physical model is suggested which explains the formation of isotopic effects in the hydrogen atomic spectrum due to isotopic differences in rate constants of the dissociation-association, transfer and ion-molecular processes in the gas-discharge plasma

No abstract available

No abstract available

[en] Techniques for CO₂-laser local and laminar spectral isotope determination of nitrogen and carton in solid substances are described. The analyzed sample is located in vacuum chamber, the chamber is filled with dosed quantity of heavy isotope of determined element. Laser irradiation results in dilution of initial gaseous mixture by the gas extracted of the sample. The amount of this gas is determined by spectroscopic isotopic analysis according to relative intensity of edges of electron-vibrational bands of isotopic N₂ and CO molecules. The detection limit equal to 10^-3 mass% is achieved at the mass of extracted sample equal to 5 mg. The technique was used for determination of nitrogen-saturation of steels during their treatment by plasma-arc planing. The analysis of nitrogen distribution was conducted for 0.15 cm depth from sample surface and showed the presence of drastic nitrogen-saturation of near the surface layer of 0.06-0.07 cm thickness. Isotopic balancing proceeds during approximately 10 min for 10 mg sample mass and the density of radiation power on sample surface equal to 10³ W/cm². The level of locality equals approximately 1 mm for 3x10⁴ W/cm² density of radiation power