Thermodynamic analysis of radionuclides behaviour in products of vapour phase hydrothermal oxidation of radioactive graphite

The behaviour of radionuclides was studied by the method of thermodynamic modelling in the wide temperature range 400–3200 K during interaction of radioactive graphite with water vapour, taken in the ratio C (s):H2O (g) = 1:10 and 1:20 (by mass). It was determined that the main components of the gaseous phase over the whole temperature range are H2O vapour, H2, gaseous CO and CO2 containing radioactive 14C. Their partial pressures exceed 103 Pa. Cs, Sr, Ca, Be, Ni radionuclides, which radioactive graphite contains, form volatile hydroxides, U, Pu radionuclides—volatile oxides. The partial pressure of these radionuclides does not exceed 10−1 Pa. Thermodynamic analysis of radionuclides behaviour in products of vapour phase hydrothermal oxidation of radioactive graphite (PDF Download Available). Available from: https://www.researchgate.net/publication/283746156_Thermodynamic_analysis_of_radionuclides_behaviour_in_products_of_vapour_phase_hydrothermal_oxidation_of_radioactive_graphite [accessed Feb 12 2018].