Study of evaporating the irradiated graphite in equilibrium low-temperature plasma
| Autor: | A. O. Pavlyuk, I. Yu. Novoselov, E. V. Bespala, Sergey Gennad’evich Kotlyarevskiy |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Nuclear and High Energy Physics Radiation Materials science Analytical chemistry chemistry.chemical_element 02 engineering and technology Human decontamination Plasma 021001 nanoscience & nanotechnology 01 natural sciences chemistry 0103 physical sciences Sublimation (phase transition) Graphite Irradiation 0210 nano-technology Porosity Forming gas Helium |
| Zdroj: | Thermophysics and Aeromechanics. 25:109-117 |
| ISSN: | 1531-8699 0869-8643 |
| DOI: | 10.1134/s0869864318010109 |
| Popis: | The paper describes a problem of accumulation of irradiated graphite due to operation of uranium-graphite nuclear reactors. The main noncarbon contaminants that contribute to the overall activity of graphite elements are iso-topes 137Cs, 60Co, 90Sr, 36Cl, and 3H. A method was developed for processing of irradiated graphite ensuring the volu-metric decontamination of samples. The calculation results are presented for equilibrium composition of plasma-chemical reactions in systems “irradiated graphite−argon” and “irradiated graphite−helium” for a wide range of tem-peratures. The paper describes a developed mathematical model for the process of purification of a porous graphite surface treated by equilibrium low-temperature plasma. The simulation results are presented for the rate of sublimation of radioactive contaminants as a function of plasma temperature and plasma flow velocity when different plasma-forming gases are used. The extraction coefficient for the contaminant 137Cs from the outer side of graphite pores was calculated. The calculations demonstrated the advantages of using a lighter plasma forming gas, i.e., helium. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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