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Syromukov S.V.,Dukhov All Russia Research Institute of Automatics VNIIA
Atomic Energy | Year: 2015

It was important to determine the effect of the chemical composition of the target and the main parameters of a tube, such as the accelerating voltage, ion current, and the atomic-molecular and isotopic composition of the ion beam, on the sputtering. The SRIM code intended for modeling the motion of ions in matter was used to calculate the sputtering yield and ion range. It was observed that sputtering rate increased because more atoms interact with the target and their energy decreased when using molecular ions. The sputtering rate was proportional to the ion flux density on target and the sputtering yield and inversely proportional to the particle concentration in the target. It also depended on the atomic-molecular and isotopic compositions of the ion beam.


Shumakov A.V.,Dukhov All Russia Research Institute of Automatics VNIIA | Tesalovskii Yu.A.,Dukhov All Russia Research Institute of Automatics VNIIA
Atomic Energy | Year: 2014

The results of research on the possibility of replacing in neutron radiation monitors in helium counters by their analog with a solid boron coating are presented. It is shown that under 3He deficit conditions such a replacement is not only possible but it can improve the performance of the monitors and lower their cost. © 2014 Springer Science+Business Media New York.


Chernikova D.,Chalmers University of Technology | Romodanov V.L.,National Research Nuclear University MEPhI | Belevitin A.G.,National Research Nuclear University MEPhI | Afanasev V.V.,National Research Nuclear University MEPhI | And 6 more authors.
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | Year: 2014

The present paper discusses results of full-scale experimental and numerical investigations of influence of construction materials of portable pulsed neutron generators ING-031, ING-07, ING-06 and ING-10-20-120 (VNIIA, Russia) to their radiation characteristics formed during and after an operation (shutdown period). In particular, it is shown that an original monoenergetic isotropic angular distribution of neutrons emitted by TiT target changes into the significantly anisotropic angular distribution with a broad energy spectrum stretching to the thermal region. Along with the low-energetic neutron part, a significant amount of photons appears during the operation of generators. In the pulse mode of operation of neutron generator, a presence of the construction materials leads to the "tailing" of the original neutron pulse and the appearance of an accompanying photon pulse at ~3ns after the instant neutron pulse. In addition to that, reactions of neutron capture and inelastic scattering lead to the creation of radioactive nuclides, such as 58Co, 62Cu, 64Cu and 18F, which form the so-called activation radiation. Thus, the selection of a portable neutron generator for a particular type of application has to be done considering radiation characteristics of the generator itself. This paper will be of interest to users of neutron generators, providing them with valuable information about limitations of a specific generator and with recommendations for improving the design and performance of the generator as a whole. © 2014 Elsevier B.V.


Kolomiytsev G.V.,National Research Nuclear University MEPhI | Igashov S.Y.,Dukhov All Russia Research Institute of Automatics VNIIA | Urin M.H.,National Research Nuclear University MEPhI
Physics of Atomic Nuclei | Year: 2014

The Green’s function method is used to formulate the single-quasiparticle dispersive optical model with the aim of semimicroscopically describing the relaxation of deep hole states in medium-heavy-mass spherical nuclei. The results of the calculations performed on the basis of this model for the 208Pb parent nucleus are compared with experimental data. © 2014, Pleiades Publishing, Ltd.


Solovyev A.S.,Dukhov All Russia Research Institute of Automatics VNIIA | Igashov S.Y.,Dukhov All Russia Research Institute of Automatics VNIIA | Tchuvil'sky Y.M.,Moscow State University
Physics of Atomic Nuclei | Year: 2014

A microscopic approach based on the algebraic version of the resonating group method was implemented by applying it to the radiative capture reaction 3He(α, γ)7Be. The astrophysical S-factor of the reaction and the branching ratio between the capture to the ground and the first excited states of the 7Be nucleus were calculated. A comparison of the theoretical results with the most recent experimental data was performed, and good agreement with these data was found. Advantages of the theoretical approach realized are indicated, and possible ways to refine upon it are outlined. © 2014, Pleiades Publishing, Ltd.


Shumakov A.V.,Dukhov All Russia Research Institute of Automatics VNIIA
Atomic Energy | Year: 2013

A method is proposed for determining the detection threshold of radiation monitors, using a radiation source with arbitrary flux, activity or mass of nuclear material. Good agreement is shown between the detection threshold of several neutron radiation monitors, determined using 244Cm and 252Cf sources with different fission-neutron fluxes. An example of converting the detection threshold measured by the proposed method or the number of detections with different background to other conditions is presented. © 2013 Springer Science+Business Media New York.


Shumakov A.V.,Dukhov All Russia Research Institute of Automatics VNIIA
Atomic Energy | Year: 2013

The results of an investigation of the effect of the number of local detectors in stationary radiation monitors and their count combinations (criteria) on the detection threshold assuming an equally probable distribution of the radioactive material in the controlled space are presented. A parameter is proposed for making quantitative comparisons of the effectiveness of the same radiation monitor with a different number of detectors, criteria and background is proposed. © 2013 Springer Science+Business Media New York.


Shumakov A.V.,Dukhov All Russia Research Institute of Automatics VNIIA
Atomic Energy | Year: 2013

It is shown that the TSRM61 and TSRM82 radiation monitors produced at the Dukhov All-Russia Research Institute of Automatics (VNIIA) can be used for detecting the limit of the contamination of the clothing, footwear and skin of the personnel in radiation enterprises. The main radionuclides corresponding to the decay products of VVER, RBMK, and fast reactor fuel are examined. © 2013 Springer Science+Business Media New York.


Shumakov A.V.,Dukhov All Russia Research Institute of Automatics VNIIA | Okishev A.N.,Dukhov All Russia Research Institute of Automatics VNIIA
Atomic Energy | Year: 2012

The results of an experimental comparison of algorithms used in radiation monitoring are presented. Serially produced TSRM-type radiation monitors, which are manufactured by the All-Russia Research Institute of Automatics, and radioactive sources are used. The data coming from the monitor's detector are processed using all algorithms simultaneously in real time. Cases of low and high counts, which conform to Poisson and Gaussian statistics, with average values of about 10 and 100, respectively, are examined. Good agreement is obtained between the experimental and computed data. The probability ratio and a priori probability algorithms give the best results. The use of these algorithms in radiation monitors will make it possible to increase the probability of detecting radiation sources by a factor of 2-3 without increasing the frequency of false alarms. © 2012 Springer Science+Business Media, Inc. Reference:.


Syromukov S.V.,Dukhov All Russia Research Institute of Automatics VNIIA
Atomic Energy | Year: 2015

A neutron generator with a sealed tube is a controlled electrophysical source of fast neutrons which is safe in the off state. A tritium- and deuterium-saturated target is bombarded by a beam of deuterium and tritium ions in order to obtain neutrons. The neutrons are formed in the reactions 3H(d, n)4He and 2H(d, n)3He. Generators are used in nuclear geophysics, inspection systems for detecting dangerous substances, thermonuclear research, and other fields of industry and science. A method is presented for calculating the neutron yield from the targets in sealed tubes in generators, taking account of the accelerating voltage, the atomic-molecular and isotopic composition of the ion beam, and the properties of the target. The computational method presented makes it possible to obtain the dependences of the neutron yield on the operating parameters of gas-filled sealed tubes. The expressions obtained can be used for almost all solid-state targets currently used in generators. © 2015 Springer Science+Business Media New York

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