Selected heavy metals (Cu, Zn, Pb and Cd) in the water and sediment of the Sava River in Serbia were investigated from three locations in the vicinity of industrial and urban settlements (Šabac, Obrenovac and Belgrade) during the period spring 2007 to autumn 2011. The fluxes of heavy metals from the river water to the sediment due to sedimentation and heavy metal resuspension fluxes arising from sediment re-suspension at high flows were determined, by application of a model for the assessment of the transport the pollutants through rivers. These fluxes were attributed mainly to natural processes.
The aim of this paper is to examine the influence of gamma and X-radiation on relevant characteristics of commercial gas filled surge arresters in the d. c. regime. This question is very important because of the wide application of gas filled surge arresters in telecommunications, military industry and space technology. We found that both types of radiation had significant influence on the performance of gas filled surge arresters
This paper describes new Monte Carlo codes for proton transport simulations in complex geometrical forms and in materials of different composition. The SRNA codes were developed for three dimensional (3D) dose distribution calculation in proton therapy and dosimetry. The model of these codes is based on the theory of proton multiple scattering and a simple model of compound nucleus decay. The developed package consists of two codes: SRNA-2KG and SRNA-VOX. The first code simulates proton transport in combined geometry that can be described by planes and second order surfaces. The second one uses the voxelized geometry of material zones and is specifically adopted for the application of patient computer tomography data. Transition probabilities for both codes are given by the SRNADAT program. In this paper, we will present the models and algorithms of our programs, as well as the results of the numerical experiments we have carried out applying them, along with the results of proton transport simulation obtained through the PETRA and GEANT programs. The simulation of the proton beam characterization by means of the Multi-Layer Faraday Cup and spatial distribution of positron emitters obtained by our program indicate the imminent application of Monte Carlo techniques in clinical practice
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