In the paper, the radioactive situation in the southeast of the Tomsk region is analyzed. The Siberian chemical combine has the greatest impact in environmental radioactivity. Areas with increased radionuclide concentrations are identified. On the example of the Tugansk deposit in the Tomsk region, the analysis of "radioactivity markers" is carried out according to data of various sources. The energy characteristics of potassium-40 in the subsoil layer of the air have been calculated. The method of remote detection of placers of uranium-thorium deposits is theoretically justified.
The paper examines an update of comparative analysis of radionuclides released into the atmosphere from Beloyarsk nuclear power plant with fast-neutron reactor for nine years in a row, from 2008 to 2016. It has been shown that the main radionuclides throw out into the atmosphere from Beloyarsk nuclear power plant are beta-active radionuclides. Based on data releases of the RPA “Typhoon”, it has been conclude that radiation situation become worse insignificantly; beside on the new reactor BN-800 was put in operation in 2016. Using Spencer-Fano’s equation, it was carried out the summary spectrum of emitted radionuclides. On example of Beloyarsk nuclear power plant, it was considered a question about ability of remote detection of raised radioactivity in the atmospheric radioactive plume. It has been shown that it possible to detect raised radioactivity in the emission plume from Beloyarsk nuclear power plant.
The paper examines location of operated Beloyarsk nuclear power plant and atmospheric stratification, various types of terrain, using gauss model of impurity propagation. In addition, the problem connected with location of radiometric system for monitoring of raised radioactive emission is discussed.
The comparative analysis of injected radionuclides into the atmosphere from nuclear power plant with advanced fast neutron reactor is carried out. On example of Beloyarsk nuclear power plant, the problem of remote detection of radioactivity in the atmospheric pollution is examined.
The paper states limited availability of the use of the automated radiation situation monitoring system and proposes radiometric complex as more reliable system in the case of an accidental release of the Siberian Chemical Enterprises.
The new diagnostic method of the influence of SHF (superhigh frequency) radiation on the atmosphere at heights 20 -
30 km is considered. By the example of AIR (artificial ionization region) make by the focused nanosecond SHF pulses
the process of atomic hydrogen generation is considered. The atomic hydrogen radiation at frequency of 1420 MHz is
used as a marker of SHF radiation.
It is determined that, thickness of the ozonosphere in the focus area changes under a variation of the electromagnetic
waves intensity which sent from ground sources.
Recombination rates of gases (in particular NO), influencing on the ozone concentration in the stratosphere are
estimated. Computer modeling an interacting of electrons with the atmospheric components into the plasma generated by
SHF is carried out and radiant power of atomic hydrogen from area adjoining to AIR is determined.
It is shown that, the combination of the received information allow to localize AIR and to estimate a level of affecting
SHF radiation. For more reliable detection of AIR in real time and at large distances the integrated approach using both
active (lidar) and passive methods of remote sensing are needed.
The apparatus-program system DAN-2 developed for registration of emission and absorption of optical and microwave
radiation initiated by gas-aerosol pollution in the atmosphere is presented. In the DAN-2, the problem of automation of
recording processes, storage and processing of the information measured in experiment has been solved.
Algorithms of the techniques incorporated in subsystems of the program complex for calculation and estimation of
atmospheric anomalies include:
- calculation of gas concentration in a plume of industrial emission taking into account gas-aerosol attenuation, an
azimuth of the device sighting to a direction on the source and the allocated illumination of the day-time sky;
- numerical modeling of formation and distribution of gas-aerosol emission fields in the atmosphere with use of various
models (Gaussian, Berlyand, etc.);
- the forecast of optical noise in the atmosphere taking into account different types of underground surfaces under
various meteorological conditions;
- the restoration algorithm of the plume structure using its image.
Application of a modular principle has created an opportunity to realize all subsystems independently from each other
and in the general complex of programs. As a tool for creation of the system software, the object-oriented instrument of
programming Delphi 5.0 has been chosen. It has a number of advantages and distinctive features such as the convenient
graphic interface with displaying of calculation results as uniform scrolling tables and graphics, access to the data files,
high speed of mathematical calculations, an opportunity of the further expansion and change of the calculation
algorithms.
Capabilities of optical methods in real-time monitoring of uranium hexafluoride and products of its hydrolysis in the air
over the production areas have been studied experimentally in the process of hydrolysis of uranium hexafluoride under
controlled conditions imitating the atmosphere. The scattering and absorption coefficients were used to study the
process of formation and kinetics of aerosols at interaction of UF6 with water vapor. It has been shown that time of
aerosol formation is mostly determined by time of the hydrolysis, and the lifetime of aerosols is determined by diffusion
and convective processes, as well as coagulation. At low concentrations of the parent material the effect of coagulation
on the process of aerosol formation is insignificant because of low collision probability of particles. When initial
concentration of UF6 (up to 20 g×m-3) increases hydrolysis occurs faster, and particles are generated during minutes and
less. At tenfold excess over the H20, concentration the intense (active) volume hydrolysis of uranium hexafluoride
occurs with formation of aerosols even at the low concentration of UF6, and this hydrolysis terminates within first
20 min. At lower concentrations of initial substances (~25 μg×m-3), the process of intense hydrolysis proceeds slower
and generation of aerosol has no pronounced time interval. It should be emphasized that termination of the intense
hydrolysis does not mean complete termination of the reaction that indicate presence of a "penetrative fraction" of UF6,
which continues to react with H20 and hydrolysis products more than hour. The experiments showed that optical
methods allow rather reliable detection of low concentrations of radioactive and toxic admixtures at UF6 hydrolysis at
the level exceeding the MPC, and the equipment based on these methods is capable of providing the reliable monitoring
of pre-emergency situations; in addition, this equipment is relatively cheap and convenient in use.
The problem of remote detecting of a radioactivity in emissions from atomic power stations (APS) is devoted. The basic
radionuclides contained in emissions of nuclear energy stations with various types of reactors have been analyzed. The
total power spectrum of electrons is determined taking into account their multiplication. Physical and chemical
reactions reducing to generation of atomic hydrogen are considered. For definition of the radiating volume in the
emission from APS, the spatial distribution of atomic hydrogen concentration has been calculated with the use Pasquill-
Gifford model. Power radiating by the emission plume from the APS with the BWR (Boiling Water Reactor) is
estimated. It has been shown, that for estimation of radiation effect on the atmosphere, it is necessary to take into
account many generations of electrons, because they have average energies exceeding considerably the ionization
potentials for atoms and molecules of the atmospheric components. The area of the maximum concentration of atomic
hydrogen in an emission plume can be determined by modelling the transport processes of admixture. The power
radiated at frequency 1420 MHz by the volume 1 km from the APS emissions can amount to ~10 -13 W that allows one
to detect the total level of activity confidently. The possible configuration of an emission plume has been calculated for
various atmospheric stratification and underlying surfaces.
This paper describes the passive remote method and its instrumental realization based on microwave radiometry for express diagnostics of radioactive elements in the atmosphere. The formation of ionized atoms and molecule in the atmosphere as result of radioactive emissions and the photochemical processes resulting in background radiation power are discussed. Analysis of the microwave radiation due to ionization and dissociation of atmospheric components interacting with radioactive elements is carried out. The photochemical processes resulting in background microwave radiation power are considered. Electron density formed in the emission plume from an atomic power station is estimated for β-active nuclides 41Ar, 133Xe, 85Kr, 131I, because they are main part of emissions from the atomic power stations and nuclei reprocessing plants. The influence of atmospheric conditions on such processes is estimated for different stratification of atmospheric parameters. As an example the results of natural experiment of detecting the atomic hydrogen radiation in the plume of emissions of nuclear cycle processing plants are presented.
Physical and chemical properties of the atmospheric components change under action of radioactive emissions, and, as a result, anomalous gas-aerosol and ionized areas are occurred and can be registered by remote optical and radiometric methods. One of the effects, in the view of passive detection of radioactive pollution is the dissociation of water vapor (H2O) and formation of anomalous fields with the high contents of hydrogen (H) and hydroxyl (OH), which spontaneous radiation in the microwave range can be used for identification of radioactivity in emissions. The process of electron multiplication due to degradation of energy of β-electrons, generated at decay of a radioactive isotope 85Kr in the emission stack is described in this paper. The estimation of atomic hydrogen concentration in cross-section of the stack on various distances from an emission source is carried out depending on its height and activity.
At the Institute of atmospheric optics of Russian Academy of Science (IAO SO RAS), the automatic express control equipment for atmospheric pollution and remote detection of aerosol and gas emissions from industrial enterprises is created over a remote method detecting radioactive anomalies on secondary displays of radioactivity. Matching several original scientific and technical decisions in one complete equipment essentially expanded opportunities of registration of emission and absorption spectra in several spectral ranges. The automated system of data processing includes some program modules, each of which is intended for the decision of specific tasks, and needed special techniques of testing. In the given paper original techniques of testing of a program complex and subprograms processing experimental data and calculations are presented. So, testing of the microwave Spectroradiometer module is based on graduation of a frequency scale, on the basis of which frequency of the signal is determined. The technique of testing and calibration of the measuring data from TV-system represents the procedure similar to television tests. The technique of testing forecast optical noise in the atmosphere is based on use of algorithms of comparison with standard optical models. In a basis of testing technique of the program module of optical correlation spectrophotometer, the graduation of a scale of voltage from two channels of analog-digital converter, which is carried out proceeding from values of the signal impressed from the external photoelectronic multiplier. Results of testing, which have shown serviceability of separate modules and a complex of programs as a whole and reliability of received results, are shown.
In the paper, algorithms of the techniques incorporated in subsystems of the program complex are presented for calculation and estimation of atmospheric anomalies, caused by industrial emissions in the atmosphere. The complex is included in the gas analyzer DAN-2, developed for registration of emission and absorption of optical and the microwave radiation initiated by gas-aerosol pollution in the atmosphere. The complex DAN-2 has been developed in the Institute of Atmospheric Optics of the Siberian Branch of the Russian Academy of Science. Techniques include: calculation of gas concentration in a plume of industrial emission taking into account gas-aerosol attenuation, an azimuth of the device sighting at a direction of the source and the allocated illumination of the day-time sky; numerical modeling of formation and distribution of gas-aerosol emission fields in the atmosphere with use of various models (Gaussian, Berlyand, etc); the forecast of optical noise in the atmosphere at operating hardware DAN-2 taking into account different types of underground surfaces under various hydro meteorological conditions; algorithm of restoration of the plume structure under its image. In the paper, results of testing of the specified algorithms are presented with use of the data of natural measurements of NO2 and SO2 concentration in the emission plume of the thermal power station GRES-2 in Tomsk, which were received by the complex DAN-2. Calculation of atmospheric background noise and distributions of the gas-aerosol plume has been carried out by various methods with use of these data.
In the paper, the automated system of data processing (ASDP) for a hardware complex DAN-2, assigned for registration of emission and absorption of optical and the microwave radiation initiated by gas-aerosol pollution in the atmosphere, is presented. The complex DAN-2 has been developed in the Institute of Atsmospheric Optics of the Siberian Branch of the Russian Academy of Science. In the ASDP, a problem of automation of recording processes, storage and processing of the information measured in experiment has been solved. Using in ASDP subsystems of the forecast of optical noise, the forecast of distribution of an impurity in a plume of gas-aerosol emission from industrial plants allows us to carry out the express-analysis of ecological pollution in the inspection zone. Application of a modular principle has created an opportunity to realize all subsystems ASPD independently from each other, thus, they can operate as independently, and in the general complex of programs. As a tool for creation of the system software, the object-oriented instrument of programming Delphi 5.0 has been chosen. It has a number of advantages and distinctive features such as the convenient graphic interface with displaying of calculation results as uniform scrolling tables and graphics, access to the data files, high speed of mathematical calculations, an opportunity of the further expansion and change of the calculation algorithms. Use of the ASPD has allowed us to improve quality of data recording, their processing, and visualization of the processed results. For the first time in the automated system, the complex estimation of ecological situation with use of experimental data in real time has been realized. The ASPD can be used also by other experimental equipment intended for the solution of problems of the atmospheric optics.
The paper analyzes secondary phenomena of atmospheric radioactive pollution caused by activity of the nuclear cycle enterprises. These effects being as indicators for remote diagnostics of a radio-activity are discussed. Excitation of a molecular and gas component in the air and various chemical reactions under the action of radiation have been considered. As a result of these reactions, new aerosol and gaseous components in the form of the excited atoms and ions appear in the atmosphere and relax with emission including microwave and optical wavelengths. The observable luminescence of the air during the emergency events at the nuclea power stations are long enough to be dedected by modern receivers. Intensity of such radiation in a radioactive plume is estimated for ecological monitoring of the atmosphere. Aerosols appearing, as a result of UF6 hydrolysis, in the atmosphere and their behavior have been also shown to be detectable with remote sensing.
The passive remote method of microwave radiometry and its instrumental realization for express diagnostics of radioactive elements in the atmosphere have been discussed. Analysis of the microwave radiation due to ionization and dissociation of atmospheric components interacting with radioactive elements is carried out. The photochemical processes resulting in background microwave radiation power have been discussed. As an example, the results of natural experiment of detecting the atomic hydrogen radiation in the plume of emissions of nuclear cycle processing plants have been presented.
The paper describes the results of experimental investigations and instrumental realization of remote method of laser induced breakdown spectroscopy (LIBS) for express diagnostics of highly toxic and radioactive elements in the water. As an example the samples of oxides of non-ferrous metals and uranium are used. The emission spectrum of materials is excited in non-equilibrium plasma of a laser spark. A laser source provides in the radiation focusing range at a wavelength of 10.6 mm the peak radiation density 108 - 5 X 107 W/cm2, the pulse duration at half-altitude is 0.3 ms. On the atmospheric experiments the radiation focusing is performed using the Cassegrainian telescope with a large mirror 0.45 m diameter. Statistical data on laser spark initiation have been obtained at distances up to 250 m - - on the solid and liquid targets.
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