New structural-optical effect in LiF-LiBO thin-film structures in the crystallization.

The effect of optical radiation during the phase transition from the amorphous to the crystalline state of matter was investigated for the first time. The results were obtained on nanoscale films of (LiF)(LiBO) compositions by sputtering on cold Ni substrates. The starting materials for films were chosen due to their wide use for tissue-equivalent ionizing radiation dosimetry.

Peculiarities of Glucose Molecules Destruction under Irradiation at the M-30 Microtron (12.5 MeV): Mass Spectrometric Studies.

The method of mass spectrometric studies was used to study the fragmentation of glucose in the gas phase upon collision with low-energy electrons (20-70 eV) before and after irradiation at the M-30 microtron (12.5 MeV) with doses of 14 and 164 kGy. The dose dependence of the transformation of glucose mass spectra was established.

Excitation of L-valine molecules by electrons and photons.

Excitation of L-valine molecules was studied by optical spectroscopy. Optical emission spectra of the L-valine molecule and optical excitation functions of molecular bands and the H spectral line were measured in the gas phase using electron impact. In the spectra of optical emission in the wavelength range of 250-500 nm, intense emission bands were found at energies of incident electrons of 30, 50 and 70 eV.

Thermoluminescence characterization of Ag-doped Li B O single crystal materials.

In this study, the thermoluminescence (TL) characteristics of Ag-doped and undoped lithium tetraborate (Li B O , LTB) materials, grown using the Czochralski method, were reported. The TL properties of LTB:Ag, such as glow curve structure, dose response, fading and reproducibility, were investigated. The glow curve of the Li B O :Ag single crystal consists of four peaks located at approximately 75, 130, 190 and 275°C; in undoped LTB, the single crystal shows a broad glow curve with peaks at 65, 90, 125, 160 and 190°C using a heating rate of 5°C/s in the 50-350°C temperature region.

Specific features of the influence of high-energy electron beams on the luminescent properties of undoped and Nb, Fe-doped Al₂O₃ crystals.

The influence of 10 MeV high-current electron beams accelerated by the M-30 microtron on the luminescent properties of the α-Al₂O₃, Al₂O₃:Nb and Al₂O₃:Fe crystals has been studied. The effect of the long-term phosphorescence at room temperature has been found that can be used to monitor electron and gamma accelerator beams.

Statistical regularities in the distribution of radionuclides in sediments of Transcarpathia mountain rivers.

The results of the low-background gamma-spectrometric measurements of sediments from three Western Carpathian mountain rivers during a three year term (2006-2009) are presented. These sediments are dynamic and very informative for environmental monitoring of a large watershed. Distances between the river sample points were 10-20 km and the total change of the altitude was 200-400 m.

Optical absorption processes in CdSe nanocrystals embedded in silicate glass and organic polymer matrices under 7-MeV electron irradiation.

Irradiation-induced bleaching occurs in the spectra of glass-embedded CdSe nanocrystals due to their ionization resulting from charge transfer between them and color centers formed in glass by electron irradiation. No bleaching in the spectra of CdSe nanocrystals encapsulated in gelatine is observed because no deep traps are formed in the matrix under electron irradiation.

Dynamic mass spectrometer for studies of organic and inorganic molecules.

Experimental technique is described and relative cross-sections of direct and dissociative ionization of CO2, C4H9OH, C2H5OH, CH3OH, C6H12O6 and C7H8 molecules by electron impact in the near-threshold energy range are obtained. The experiment is performed on a setup with ion mass separation based on a monopole mass spectrometer which is proved to be successful for such a sort of experiments. For the incident electron energy range from 7 to 35 eV the energy dependences of cross-section of appearance of the main molecule ions and the fragment ions formed due to its dissociation are given.