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Open AccessArticle

Effect of Gamma Irradiation on Structural Features and Dissolution of Nuclear Waste Na–Al–P Glasses in Water

1
Federal State Unitary Enterprise-United Ecological, Scientific and Research Centre of Decontamination of Radioactive Waste (RAW) and Environmental Protection, 119121 Moscow, Russia
2
Institute of Geology of Ore deposits, Petrography, Mineralogy and Geochemistry, 119017 Moscow, Russia
3
Department of Materials, Faculty of Engineering, The University of Sheffield, Sheffield S1 3JD, UK
4
Institute of Physical Chemistry and Electrochemistry, 119071 Moscow, Russia
5
Vernadsky Institute of Geochemistry and Analytical Chemistry, 119991 Moscow, Russia
*
Author to whom correspondence should be addressed.
Sustainability 2020, 12(10), 4137; https://doi.org/10.3390/su12104137
Received: 17 April 2020 / Revised: 11 May 2020 / Accepted: 12 May 2020 / Published: 19 May 2020
(This article belongs to the Special Issue Nuclear Waste Management and Sustainability)
Structural properties and water dissolution of six sodium–aluminum–phosphate (NAP) glasses have been investigated before and after irradiation by a gamma-ray source based on 60Co. Two of these samples were of simple composition, and four samples had a complex composition with radionuclide simulants representing actinides, fission, and activated corrosion products. Samples of the simple composition are fully vitreous, whereas samples of the complex composition contained up to 10 vol.% of aluminum–phosphate, AlPO4, and traces of ruthenium dioxide, RuO2. Based on the study of pristine and irradiated glasses, it was established that the radiation dose of 62 million Gray had practically no effect on the phase composition and structure of samples. At the same time, the rate of leaching of elements from the irradiated samples by water was decreased by about two times. View Full-Text
Keywords: highly radioactive waste; immobilization; matrix; sodium–aluminum–phosphate glass; properties; irradiation; leaching resistance. highly radioactive waste; immobilization; matrix; sodium–aluminum–phosphate glass; properties; irradiation; leaching resistance.
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Luzhetsky, A.V.; Petrov, V.A.; Yudintsev, S.V.; Malkovsky, V.I.; Ojovan, M.I.; Nickolsky, M.S.; Shiryaev, A.A.; Danilov, S.S.; Ostashkina, E.E. Effect of Gamma Irradiation on Structural Features and Dissolution of Nuclear Waste Na–Al–P Glasses in Water. Sustainability 2020, 12, 4137.

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