ABSTRACT
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. The results indicate the dominance in mass spectra of symmetric fission channels of the molecule itself and its fragments formed under the action of M-30 microtron radiation. The same ways of fragmentation of glucose one can expect under chemical, thermal, and biological processes at the cellular level. The dominant channels of fragmentizing the glucose molecule without and considering its radiation treatment are explained within the framework of the method of structural combinations. The obtained results are essential for understanding the processes of cellular biochemistry and biophysics involving glucose, the hierarchy of its fragmentation channels under the influence of terrestrial radiation factors, and metabolic processes.
Subject(s)
Electrons , BiophysicsABSTRACT
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.
Subject(s)
Aluminum Oxide/chemistry , Electrons , Iron/chemistry , Luminescent Measurements , Niobium/chemistry , Particle Accelerators , Radiotherapy, High-Energy/instrumentation , Aluminum Oxide/radiation effects , Humans , Niobium/radiation effects , Radiotherapy Dosage , Radiotherapy, High-Energy/methodsABSTRACT
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. The proposed sampling scheme allows to investigate the changes of seasonal and spatial distributions of the radionuclides in sediment. The statistical correlations between the sampling points, the water level of the river and the contents of natural or anthropogenic radionuclides in sediment were studied. The effect of the intensive leaching of radionuclides from sediments during the flood season is shown and this can be considered as the principal self-purification mechanism.
