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TUPSA44 |
Radiation-induced Nanocomposite Polymer Films Fabrication Techniques | |
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Metal nanoparticles formation under the ionizing radiation can be processed under variety of conditions, which include liquid and solid media, heterogeneous and complexed phases, low and high dose rates. The reverse micelles (RM), as nano-reactors, were used for metal nanoparticles (NPs) formation*. Optical properties of metallic NPs in RM solution, in transparent polymer films and membranes were registered using UV-VIS spectrophotometry. The purpose of investigation was the determination of the physico-chemical properties of perfluoro-sulphonated membranes (Nafion and MF-4SK) with incorporated metallic NPs (Pd, Pt, Ag, Au). Modification of membranes done by dipping of the samples in NP RM solution was controlled spectrophotometrically at different stages of membranes contact with modifying media. Atomic force microscopy (AFM) established, that the size of NP (Z-size) from the micellar solutions was in the range of 1-10 nm depending on the dose (5-15 kGy) of gamma-irradiation carried out at RKhM gamma-20 setup or EB-irradiation at UELV-10 accelerator. Results of metal NPs incorporation into membranes via dipping in NP RMS were compared with data obtained during research of cellophane films NPs-modification conducted "in situ"** - at the same time with the synthesis on the NPs in RM systems under irradiation.
*A. Revina, Patent RF No. 2322327. Bull. No. 11 (2008) **A. Revina, Patent RF No. 2212268. Bull. No. 26 (2003) |
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| TUPSA46 | Effect of Ozone in Experiments on the Development of Food Irradiation Methods | 240 |
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| During sterilization by electron beam ozone is formed in the air, which increases the efficiency of microorganism suppression. When studying the processes of radiation sterilization, it is necessary to estimate the contribution of the chemical factor of ozone formation. The results of experiments on the irradiation of several cultures of microorganisms are presented, which make possible to evaluate the degree of influence of the ozone formation factor in air radiolysis. In experiments, the dependence of the degree of microbial suppression on the method of installing a test tube with a nutrient medium under a beam of an accelerator was investigated. Irradiation was carried out with horizontal and vertical installation of test tubes with cultures. With the horizontal, the size of the area of contact between the medium and the ozonized air inside the tube is higher than in the vertical tube. The effect of irradiation with a horizontal position of the tube is higher than with the vertical arrangement. The irradiation process was monitored by film dosimeters located near and inside the test tubes with a substrate analog. The calculations of the amount of ozone produced in the experiments were performed, and simulation of the irradiation process was carried out using the computer code "Beam Scanning". From the results of this study we conclude that ozone formation has a significant effect on the suppression of microorganisms during irradiation. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-RUPAC2018-TUPSA46 | |
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| TUPSA47 | Regularities of Inhibition of Conditionally Pathogenic Microflora Under the Influence of Accelerated Electron Beams | 243 |
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| Article is devoted to the study of the irradiation efficiency of model systems containing conditionally pathogenic microorganism by electron beams with energy of 7 and 10 MeV. The research on the effectiveness of inhibition of the initial degree of inoculation of the microorganisms E. coli and Salmonella were carried out. Irradiation doses up to 10 kGy performed at radiation-technological installations the A.N. Frumkin Institute of Physical Chemistry and Electrochemistry RAS and State Research Center Burnasyan Federal Medical Biophysical Center. The results of the effective inhibition of initial contamination degree for the two samples, which model liquid and solid nutrient media, were obtained. It is shown that it is necessary to take into account not only the effectiveness of microorganism inhibition on specific products, but also the installation efficiency for a particular sample. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-RUPAC2018-TUPSA47 | |
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WEPSB15 |
Correction of Scanning System Deflecting Magnet Steel Core Hysteresys on UELV-10-10-S-70 Accelerator | |
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| In radiation technologies, an electron beam is distributed in space by the deflecting magnets of the beam scanning system. The deflecting magnets always contain a ferromagnetic yoke, which is under the influence of alternating magnetic fields. A characteristic feature of ferromagnets in alternating fields is the existence of a hysteresis loop that affects the dependence of the effective magnetic field on time, and accordingly on the beam distribution in space and on the uniformity of irradiation dose. Depending on the process conditions, the hysteresis can have both a useful effect, which increases the uniformity of the distribution of dose fields and detrimental, which decreases the dose uniformity and erodes the units of the installation. The effect of the influence of hysteresis in the yoke of the scanning system deflecting magnet of the accelerator UELV-10-10-S-70 at IPCE RAS was studied. The negative influence of hysteresis was manifested in local overheating of the output foil and a decrease of beam utilization efficiency. Computer simulation of the scanning process with hysteresis was carried out using the computer code "Beam Scanning". Methods for eliminating the negative influence of hysteresis and optimizing the scanning system by selecting the steel grade of the magnetic yoke and changing the shape of the magnet current curve are proposed. These methods are implemented on an accelerator at IPCE RAS. | ||
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| THPSC33 | Radiation Installation and Accelerator UELV-10-10-C-70 Beam Parameters Control, Management and Registration System | 472 |
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| Irradiation of medical products on radiation installations based on electron beam is a responsible task. To increase the quality of irradiation, continuous monitoring of the installation operation is necessary. The design of the system for monitoring and recording parameters of a radiation-technological installation based on the UELV-10-10-C-70 accelerator at IPCE RAS is presented. The monitoring system collects data in real time with number of sensors and performs its analysis and registration, informs about errors and stops the irradiation process in emergency situations. A simple solution for transferring data from sensors to a computer, which traditionally remains a bottleneck in technology, is proposed. An important task of the control system is to determine the parameters of the accelerator beam, such as pulse current and energy spectrum. Various methods, based on simple equipment, for determining the energy spectrum of accelerator beam, which can be used for continuous monitoring without interrupting the production process, are proposed. A computational model is developed for processing the results of measurements in these methods, using the computer code "Beam Scanning". In current version of the system the data about the conveyor movement, scanning system deflecting magnet current and accelerator state is collected. The beam spectrum sensor based on the Faraday cylinder is in the process of development. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-RUPAC2018-THPSC33 | |
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