No abstract available

[en] Mathematical model for polluted ground irradiation is proposed. Method for radiation environment calculation that accounts to 'Shelter' object and polluted areas irradiation is considered. Results of the dose confinement mounting pad are presented

No abstract available

[en] GEANT 4 Monte-Carlo simulation toolkit is used to study the kinematic recoil method of "9"9Mo photonuclear production. Simulation for bremsstrahlung photon spectrum with maximum photon energy 30 MeV showed that for MoO_3 nanoparticle escape fraction decreases from 0.24 to 0.08 when nanoparticle size increases from 20 nm to 80 nm. For the natural molybdenum and pure "1"0"0Mo we obtained the lower values: from 0.17 to 0.05. The generation of accompanying molybdenum nuclei is significantly lower for pure "1"0"0Mo and is about 3.6 nuclei per single "9"9Mo nucleus, while natural molybdenum nanoparticle produce about 48 accompanying nuclei. Also, we have shown that for high-energy photons escape fraction of "9"9Mo decreases, while production of unwanted molybdenum isotopes is significantly higher. - Highlights: • We have simulated kinematic recoil method for "9"9Mo production in nanoparticles. • Accurate simulations of photonuclear reactions and reaction products using GEANT4 were performed. • Escape fractions for "9"9Mo and production of accompanying molybdenum isotopes were calculated.

[en] We developed mathematical model of the facility for gamma-radiation angle distribution measurement and calculated response functions for gamma-radiation intensities. We developed special software for experimental data processing, the 'Shelter' object radiation spectra unfolding and Sphere detector (ShD) angle resolution estimation. Neuronet method using for detection of the radiation directions is given. We developed software based on the neuronet algorithm, that allows obtaining reliable distribution of gamma-sources that make impact on the facility detectors at the measurement point. 10 refs.; 15 figs.; 4 tab

[en] Model calculations of total dust quantity, which can raise during possible collapse of 'Ukryttya' building structures, are shown. In estimates, particle 'jump-up' mechanism was applied, i.e. particle raise occurring due to dusted surface oscillation. It is shown that the particles of more 20 μm diameter are capable to overpass laminar boundary sublayer and to raise over 'Ukryttya' ruins

[en] Method for beta and gamma radiation exposure rate calculations inside the radioactively contaminated buildings is presented. Method is based on the realistic model accounting for removable and irremovable components of the surface contamination. Exposure rate calculations for areas with considerable level of surface contamination are presented and discussed

No abstract available

[en] Biological shielding physical simulation and angular distribution measurement method within the 'Shelter' object conditions using 'Ekran' facility was considered. Method for biological shielding mathematical simulation using data obtained with ShD-1 facility is presented. It is shown that results of mathematical simulation have satisfactory agreement with those obtained with 'Ekran' facility

No abstract available